Four categories of welded pipe blanks for high frequency welded pipe equipment (3)
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【概要描述】Welded pipe blank is the raw material of high frequency welded pipe equipment to make welded pipe. Its mechanical properties and chemical composition have a profound impact on the quality of welded pipe, and its width is the first factor that determines the strength of the weld. We usually say that the width of the welded pipe blank is suitable, which refers to the width of the given thickness; the determination of the width is restricted by many factors.
Four categories of welded pipe blanks for high frequency welded pipe equipment (3)
【概要描述】Welded pipe blank is the raw material of high frequency welded pipe equipment to make welded pipe. Its mechanical properties and chemical composition have a profound impact on the quality of welded pipe, and its width is the first factor that determines the strength of the weld. We usually say that the width of the welded pipe blank is suitable, which refers to the width of the given thickness; the determination of the width is restricted by many factors.
- Sort:Information
- Auth:
- Source:
- Release time:2022-05-19 11:30
- Pvs:
Welded pipe blank is the raw material of high frequency welded pipe equipment to make welded pipe. Its mechanical properties and chemical composition have a profound impact on the quality of welded pipe, and its width is the first factor that determines the strength of the weld. We usually say that the width of the welded pipe blank is suitable, which refers to the width of the given thickness; the determination of the width is restricted by many factors.
This article discusses various calculation methods of tube blank width, and points out the commonalities and differences of various calculation methods and their applicable conditions. At the same time, the defects of the welded pipe blanks are divided into two categories: dominant and recessive, and the adverse effects of the defects of the welded pipe blanks on the production of welded pipes are analyzed.
Classification of welded pipe blanks:
The welded pipe blanks of high frequency welded pipe equipment can be divided into four categories according to the steel type, the temperature when rolling the pipe blank, the width of the source of the welded pipe blank and the edge state of the welded pipe blank. The following introduces the welded pipe blanks classified according to the width of the source of the welded pipe blank.
Classification according to the width of the source of the welded pipe blank
The raw materials of the welded pipe blank are divided into three types: narrow band, medium wide band and wide band according to the width, see Table 4
Narrow strip welded pipe blank
There are two types of narrow-band welded pipe blanks: one is to hot-roll the ingot into a specific width (≤400mm) and a specific thickness of hot-rolled non-trimmed welded pipe blanks according to the needs of the welded pipe specifications, which are directly used for the production of welded pipes, such as small diameter water and gas pipes. Welded tube blanks. The other is to select a narrow steel strip with a width of 400mm or less and a thickness of t according to the required width of the rolled welded pipe (Φ×t).
Medium and Wide Band Welded Tube Blanks
Welded pipe blanks derived from medium and wide widths basically need to be slit and cut into pipe blanks with a width that meets the requirements of welded pipe production; of course, there are also cold and hot.
The sources of butt welded pipe blanks are classified by width, which is helpful for us to have a deeper understanding of the quality of welded pipes and to ensure the quality of welded pipes from the perspective of raw materials. Generally speaking, narrowband always has more quality defects than medium wideband, and medium wideband has more quality defects than wideband. Judging from the actual use and word-of-mouth demonstration, the comprehensive quality of the wide board is more reassuring.
The basic principle of determining the width of welded pipe blank
The basic idea of determining the width of the welded pipe blank is to manufacture a welded pipe that meets the final requirements. Under the premise of assuming that the thickness remains unchanged, it is necessary to consider the amount of narrowing of the pipe blank during the forming process, the consumption of internal and external burrs during welding, and The consumption reserved for the reduction of the diameter of the welded pipe during the sizing process, etc., in this way, the width of the pipe blank to be given must be larger than the width required for the finished pipe.
Analysis of Tube Blank Width Consumption in Shaping
According to the welding pipe production process and shaping principle, in order to obtain a finished pipe with a neutral layer diameter D, it is necessary to use a welded pipe D' larger than the neutral layer diameter to be shaped for consumption in the shaping process, so that the shaped "consumed" The width of the dropped tube blank is equal to (D'-D)π. and sizing allowance.
Analysis of Tube Blank Consumption During Extrusion Welding
The welded pipe to be sized comes from the extrusion and welding of the pipe to be welded. It is easy to know from the principle of metal extrusion welding (forging welding). In this process, some metal will inevitably be extruded. This part of the metal that is extruded is called welding allowance before it has received extrusion welding, and this part of the allowance is specially prepared for extrusion welding. When the tube blank to be welded is extruded and welded, on the one hand, the circumference of the tube will be shortened under the action of the extrusion force of 20~40MPa; on the other hand, part of the molten metal will be extruded, and this part of the extruded metal will adhere On the inner and outer walls of the weld, they are called inner and outer burrs in the welded pipe process. Obviously, in terms of volume, if the metal particles spattered during the welding process are added, then the volume of the inner burr, outer burr, and the spattered metal particles plus the circumferential shrinkage should theoretically be exactly equal to the welding allowance. Then, the expression formula of the width of the welding allowance is as follows:
In other words, the internal and external burrs and splashed metal particles are the dominant transformation state of the width of the welded tube blank; the invisible consumption of circumferential compression is often overlooked, but this part of the consumption is the most important. It requires great attention from crew designers and adjusters.
Factors Affecting the Width of Welded Tube Blanks
The factors affecting the consumption of the welded pipe process mainly include five aspects: material, model, hole type, process and operation.
Material factor
Material factors mainly include width tolerance and thickness tolerance, strength and hardness, trimming and non-cutting.
The influence of the width tolerance on the width of the tube blank is self-evident. Taking the outer diameter of the welded pipe as an example, when its one-way tolerance exceeds 1mm, according to the calculation formula of the tube blank, it will have an impact of about 0.3mm on the outer diameter of the welded pipe.
The influence of the thickness tolerance on the width of the tube blank is mainly manifested in that the thickness can be "converted" into the width.
Influence of strength and hardness on tube width
According to the mechanical properties of metal materials, it can be said that strength and hardness are twin brothers. When the strength is high, the hardness is usually high. Strength and hardness are important indicators reflecting the ability of materials to resist elastic-plastic deformation, and are reflected in the width of the tube blank. During the process of forming, welding and sizing of the welded tube, the forming force of the tube blank in the roll pass and the longitudinal tensile stress generated by it together. Under the action, the circumference of the tube blank will be more or less reduced. The circumference of the tube blank with high strength is reduced less, and the required process allowance is less; the circumference of the tube blank with low strength is reduced more, and the required process allowance is more. Therefore, for the production of welded pipes of the same specification, the width of the high-strength tube blank should be narrower than that of the low-strength tube blank, and vice versa; especially for those special hose blanks or super-hard tube blanks, when determining This factor must be taken into account when determining the width of the blank, otherwise, it will increase the difficulty of producing this type of pipe, and it will even be impossible to produce a welded pipe with a qualified outer diameter and a qualified surface.
Influence of trimming and non-trimming on the width of tube blank
Nowadays, there are few uncut tube blanks in the production of welded pipes, so I won't go into details.
Welded pipe unit factors
Taking the adjustment accuracy as an example, the adjustment accuracy of small units is usually higher than that of large and medium-sized units. For example, the standard stipulates: for 32 units to produce φ25mm welded pipes, the maximum accuracy of the outer diameter of the pipes is ±0.1mm; for 114 units to produce Φ114mm welded pipes, the highest precision It is ±0.57mm. Only the respective allowable blank width tolerance zones are ±0.35mm and ±1.79mm, respectively. Therefore, in general, when the unit is large, the requirements for the width of the tube blank are not so strict; on the contrary, when the unit is small, the requirements for the width of the tube blank must be high.
Cantilever machine and gantry machine
There are generally two types of restraint methods for the flat roll shaft of the welded pipe unit, the cantilever machine and the gantry type, and there are great differences between the force application method of the unit and the force method of the welded pipe.
The rolling force of the cantilever mill is on the side of the constraint point. After the roller is stressed, the constraint side has a tendency to rotate around the fulcrum. , which in turn affects the accuracy of the welded pipe. This feature requires that the width of the tube blank given is a little narrower than that of the gantry type.
The force of the gantry type unit, the force point is in the middle of the two restraint points, there is no rotation trend, the structure is stable, and it is stronger when it is strong. Therefore, the width of the tube blank used in the gantry type unit can be appropriately wider, and the wider part can be consumed in the closed hole section, the welding section and the sizing section in the form of longitudinal extension and circumferential contraction, which generally does not affect the accuracy of the welded pipe. Excessive influence.
Unit style
The method of cloth rolls, whether it has a vertical roll group, the traditional arch or the universal arch, and whether the two-roll extrusion method or the three-roll or multi-roll extrusion method is used, etc., all have an impact on the determination of the width of the tube blank. Taking the extrusion roller as an example, the nominal extrusion force applied by the vertical two-roll extrusion roller to the tube blank is generally larger than that of the three-roller, but the actual extrusion force received by the welding edge is not necessarily large. The former is easy to shorten the circumference of the tube blank, that is, more welding allowance is required. When calculating the width of the tube blank, it is necessary to be wider.
Hole factor
Hole type R size
If the entire set of roll passes, especially the pass R from the closed pass back, is generally designed to be small, then even after the wider tube blank enters the pass, the smaller pass will force the tube blank to produce a larger circumferential direction. Large compression; Conversely, if the roll pass R is too large, after encountering the entry of the tube blank of the same width, the circumferential compression of the pass on the tube blank will be less, and even the narrower tube blank will not show its narrowness. .
Forming method
Different molding methods have different requirements for the width of the tube blank. Comparing circumferential deformation and edge deformation, the former requires a larger forming allowance than the latter. This is because: According to the deformation principle, the edge of the deformed tube blank is approximately equal to the radius R on the full width of the tube blank ¼ arc, and before entering the closed hole shape, the minimum amount of circumferential deformation can only be changed to 2 of the radius of the finished tube. However, the edge radius of the tube blank in the edge deformation method can be deformed to the radius of the finished tube, or even smaller than the radius of the finished tube. In this way, in the subsequent deformation, in order to change the edge of the tube blank by the circumferential deformation method to the radius of the finished tube, it is necessary to apply a larger radial and circumferential rolling to the edge of the tube blank by means of a closed hole shape smaller than the edge of the tube blank. force. The large rolling force reduces the radius of the edge of the tube blank, and the circumference of the tube blank is also greatly compressed (relative to the edge deformation) under the combined action of the guide ring and the pass; and the edge of the tube blank obtained by the edge deformation method It is almost the same as the radius of the closed hole type. The tube blank is only rolled by a small radial and circumferential rolling force in the closed hole type, so the perimeter of the tube blank is shortened very little. requirements are different.
Operational factors
Affected by the debugging skills, experience and sense of responsibility of the welded pipe, the width of the tube blank may be abnormally narrow or abnormally wide during the debugging operation, and even mislead the designer into thinking that the designed tube blank width is inappropriate. A typical case is: if the forming force and extrusion force applied in the forming closed-hole type stage and the welding extrusion stage are too large, the designed forming allowance and welding allowance will be insufficient, and then part of the sizing allowance will be squeezed. , there is an illusion that the sizing allowance is too small and insufficient or that there is no sizing allowance.
It can be seen that there are many factors affecting the given width of the tube blank, which need to be considered comprehensively.
The above is one of the "width of the source of the welded pipe blank" about the high frequency welded pipe equipment. And the factors that affect the consumption of the welded pipe process mainly include five aspects: material, model, hole type, process and operation.
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Time of issue : 2025-02-11
1. The characteristics of high-precision steel pipe
High dimensional accuracy: small outer diameter, wall thickness tolerance (usually up to ±0.05mm), low ellipticity.
Excellent surface quality: smooth weld without burrs, surface finish Ra≤0.8μm.
Stable mechanical properties: weld strength close to the base material, uniform compressive/tensile properties.
Applicable materials: stainless steel (304/316L), carbon steel, alloy steel (such as API series), etc.
2. Core production process
(1) Type of pipe welding machine
High-frequency welding (HFW) : high efficiency, suitable for medium thin wall pipe (Φ10~Φ600mm), need to cooperate with precision forming unit.
Laser welding: small heat affected zone, narrow weld (0.1~0.3mm), suitable for ultra-thin walls (such as 0.3mm) or special alloys.
TIG welding: For high alloy steel or thick wall pipe, higher weld purity.
(2) Key process links
Forming process: multi-roll continuous cold forming, dynamic adjustment of roll parameters to compensate for rebound.
Welding control:
High frequency welding: precise control of current frequency (100~400kHz) and extrusion amount.
Laser welding: focus position accuracy ±0.05mm, real-time depth monitoring (such as CCD vision).
Online detection:
Eddy current inspection (ET) : Detection of surface cracks.
Ultrasonic inspection (UT) : detection of internal defects (sensitivity Φ0.5mm equivalent flat hole).
Laser caliper: Outer diameter closed loop control (accuracy ±0.01mm).
3. Post-processing technology
Heat treatment: bright annealing (hydrogen nitrogen protection atmosphere) to eliminate stress, hardness fluctuation ≤3HRC.
Straightening: multi-roll precision straightening, straightness ≤0.5mm/m.
Surface treatment:
Electrolytic polishing (EP) : For medical/food grade stainless steel tubes, Ra up to 0.2μm.
Coating: hot dip galvanizing (zinc layer ≥80μm) or electroless nickel plating (uniform thickness ±2μm).
4. Typical application areas
Automobile manufacturing: fuel injection pipe (tolerance ±0.03mm), hydraulic pipe.
Semiconductor equipment: Ultra-high clean gas delivery pipe (inner wall EP treatment, particle ≤Class 5).
Medical instruments: endoscopic catheter (Φ1~5mm, wall thickness 0.1mm).
Energy industry: Instrument tubes for nuclear power plants (SA213-TP347H material, intergranular corrosion test passed).
5. Quality control standards
International standard:
ASTM A269 (Universal Seamless and Welded Austenitic Stainless Steel Pipe)
EN 10305-4 (Precision welded pipes for hydraulic systems)
Industry certification: ISO 9001, PED 2014/68/EU (Pressure Equipment Directive).
6. Technological trends
Intelligent production: AI algorithm optimizes welding parameters, and the yield is increased to more than 99.5%.
Composite process: laser + arc composite welding, both efficiency and quality (speed increased by 30%).
Green manufacturing: low energy high frequency power supply (efficiency ≥90%), waste acid recovery ≥95%.
Through the above process optimization and strict quality control, the high-precision steel pipe produced by the pipe welding machine can meet the demanding requirements of size, performance and reliability in high-end industrial fields. In actual production, the process route needs to be customized according to the material characteristics and uses, for example, medical tubes need to undergo additional passivation treatment and biocompatibility testing.
For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier:www.usedpipemill.com
JinYuJie-Used Pipe Mills Supplier(Please click the link→) :second-hand pipe mill
1. The characteristics of high-precision steel pipe
High dimensional accuracy: small outer diameter, wall thickness tolerance (usually up to ±0.05mm), low ellipticity.
Excellent surface quality: smooth weld without burrs, surface finish Ra≤0.8μm.
Stable mechanical properties: weld strength close to the base material, uniform compressive/tensile properties.
Applicable materials: stainless steel (304/316L), carbon steel, alloy steel (such as API series), etc.
2. Core production process
(1) Type of pipe welding machine
High-frequency welding (HFW) : high efficiency, suitable for medium thin wall pipe (Φ10~Φ600mm), need to cooperate with precision forming unit.
Laser welding: small heat affected zone, narrow weld (0.1~0.3mm), suitable for ultra-thin walls (such as 0.3mm) or special alloys.
TIG welding: For high alloy steel or thick wall pipe, higher weld purity.
(2) Key process links
Forming process: multi-roll continuous cold forming, dynamic adjustment of roll parameters to compensate for rebound.
Welding control:
High frequency welding: precise control of current frequency (100~400kHz) and extrusion amount.
Laser welding: focus position accuracy ±0.05mm, real-time depth monitoring (such as CCD vision).
Online detection:
Eddy current inspection (ET) : Detection of surface cracks.
Ultrasonic inspection (UT) : detection of internal defects (sensitivity Φ0.5mm equivalent flat hole).
Laser caliper: Outer diameter closed loop control (accuracy ±0.01mm).
3. Post-processing technology
Heat treatment: bright annealing (hydrogen nitrogen protection atmosphere) to eliminate stress, hardness fluctuation ≤3HRC.
Straightening: multi-roll precision straightening, straightness ≤0.5mm/m.
Surface treatment:
Electrolytic polishing (EP) : For medical/food grade stainless steel tubes, Ra up to 0.2μm.
Coating: hot dip galvanizing (zinc layer ≥80μm) or electroless nickel plating (uniform thickness ±2μm).
4. Typical application areas
Automobile manufacturing: fuel injection pipe (tolerance ±0.03mm), hydraulic pipe.
Semiconductor equipment: Ultra-high clean gas delivery pipe (inner wall EP treatment, particle ≤Class 5).
Medical instruments: endoscopic catheter (Φ1~5mm, wall thickness 0.1mm).
Energy industry: Instrument tubes for nuclear power plants (SA213-TP347H material, intergranular corrosion test passed).
5. Quality control standards
International standard:
ASTM A269 (Universal Seamless and Welded Austenitic Stainless Steel Pipe)
EN 10305-4 (Precision welded pipes for hydraulic systems)
Industry certification: ISO 9001, PED 2014/68/EU (Pressure Equipment Directive).
6. Technological trends
Intelligent production: AI algorithm optimizes welding parameters, and the yield is increased to more than 99.5%.
Composite process: laser + arc composite welding, both efficiency and quality (speed increased by 30%).
Green manufacturing: low energy high frequency power supply (efficiency ≥90%), waste acid recovery ≥95%.
Through the above process optimization and strict quality control, the high-precision steel pipe produced by the pipe welding machine can meet the demanding requirements of size, performance and reliability in high-end industrial fields. In actual production, the process route needs to be customized according to the material characteristics and uses, for example, medical tubes need to undergo additional passivation treatment and biocompatibility testing.
For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier:www.usedpipemill.com
JinYuJie-Used Pipe Mills Supplier(Please click the link→) :second-hand pipe mill

Time of issue : 2025-02-08
1.The role of pipe welding machine in the manufacture of automobile frame
Pipe production: The welding pipe machine is used to manufacture high-precision welded steel pipes, which constitute the longitudinal beams, beams, anti-collision beams and other key components of the automobile frame. High frequency welding (HFW) or laser welding technology can produce steel pipes with uniform wall thickness and strength of more than 800MPa to meet the needs of lightweight.
Customized processing: Through flexible forming technology, the welding machine can produce special-shaped cross section pipes (such as rectangular, trapezoidal), adapt to the topology optimization design of different models of frames, improve space utilization and impact energy absorption efficiency.
2.The core requirements of the welding pipe process for automobile frames
Material properties: DP600/DP800 duplex steel or 22MnB5 thermoforming steel should be used, and online heat treatment (such as induction annealing) should be carried out after welding to ensure the microstructure consistency between the weld zone and the base material and avoid HAZ (heat affected zone) softening.
Dimensional accuracy: Diameter tolerance should be controlled within ±0.2mm, ellipticity ≤0.5%, to ensure the matching accuracy of the assembly and stamping parts (clearance <0.5mm).
3.Key technology breakthrough point
Laser-MAG composite welding: the penetration depth can reach 8mm, the welding speed is increased to 6m/min, the heat input is reduced by 30%, and the welding deformation of the frame is significantly reduced (≤1.5mm/m).
Online quality monitoring: high-speed CCD vision system (sampling rate 2000fps) with eddy current detection, to achieve real-time detection of weld defects, miss rate <0.01%.
4.Cost-performance balance
Compared with the stamping and welding structure, the welded pipe frame can reduce the weight by 15-20%, the material utilization rate is increased to 95%, and the manufacturing cost of the bicycle is reduced by about 1200 yuan. However, it is necessary to increase the investment in roller forming molds (about 2 million yuan/set).
5.Industry Application Cases
- An independent brand pure level station adopts 3D variable cross-section welded pipe subframe, with torsional rigidity increased to 27000Nm/°, 40% higher than the traditional structure, and the battery pack space utilization increased by 12%.
Conclusion
The penetration rate of welded pipe technology in the field of automotive frames is growing at a rate of 8% per year, and future development directions include:
Intelligent welded pipe system (digital twin model real-time control molding parameters)
Magnesium alloy /CFRP composite pipe welding process
Topological optimization driven continuous forming technology for variable thickness pipes
It is recommended to pay attention to the update of the ISO 15614 standard and the latest certification requirements for automotive welded pipe processes in ASME BPVC Section IX to ensure technical compliance.
For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier:www.usedpipemill.com
JinYuJie-Used Pipe Mills Supplier(Please click the link→) :second-hand pipe mill
1.The role of pipe welding machine in the manufacture of automobile frame
Pipe production: The welding pipe machine is used to manufacture high-precision welded steel pipes, which constitute the longitudinal beams, beams, anti-collision beams and other key components of the automobile frame. High frequency welding (HFW) or laser welding technology can produce steel pipes with uniform wall thickness and strength of more than 800MPa to meet the needs of lightweight.
Customized processing: Through flexible forming technology, the welding machine can produce special-shaped cross section pipes (such as rectangular, trapezoidal), adapt to the topology optimization design of different models of frames, improve space utilization and impact energy absorption efficiency.
2.The core requirements of the welding pipe process for automobile frames
Material properties: DP600/DP800 duplex steel or 22MnB5 thermoforming steel should be used, and online heat treatment (such as induction annealing) should be carried out after welding to ensure the microstructure consistency between the weld zone and the base material and avoid HAZ (heat affected zone) softening.
Dimensional accuracy: Diameter tolerance should be controlled within ±0.2mm, ellipticity ≤0.5%, to ensure the matching accuracy of the assembly and stamping parts (clearance <0.5mm).
3.Key technology breakthrough point
Laser-MAG composite welding: the penetration depth can reach 8mm, the welding speed is increased to 6m/min, the heat input is reduced by 30%, and the welding deformation of the frame is significantly reduced (≤1.5mm/m).
Online quality monitoring: high-speed CCD vision system (sampling rate 2000fps) with eddy current detection, to achieve real-time detection of weld defects, miss rate <0.01%.
4.Cost-performance balance
Compared with the stamping and welding structure, the welded pipe frame can reduce the weight by 15-20%, the material utilization rate is increased to 95%, and the manufacturing cost of the bicycle is reduced by about 1200 yuan. However, it is necessary to increase the investment in roller forming molds (about 2 million yuan/set).
5.Industry Application Cases
- An independent brand pure level station adopts 3D variable cross-section welded pipe subframe, with torsional rigidity increased to 27000Nm/°, 40% higher than the traditional structure, and the battery pack space utilization increased by 12%.
Conclusion
The penetration rate of welded pipe technology in the field of automotive frames is growing at a rate of 8% per year, and future development directions include:
Intelligent welded pipe system (digital twin model real-time control molding parameters)
Magnesium alloy /CFRP composite pipe welding process
Topological optimization driven continuous forming technology for variable thickness pipes
It is recommended to pay attention to the update of the ISO 15614 standard and the latest certification requirements for automotive welded pipe processes in ASME BPVC Section IX to ensure technical compliance.
For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier:www.usedpipemill.com
JinYuJie-Used Pipe Mills Supplier(Please click the link→) :second-hand pipe mill

Time of issue : 2025-02-07
89 The working principle of the pipe welding machine 89 The pipe welding machine uncoils the steel strip, feeds and welds it into a round steel pipe, and then cools, straightens and cuts the steel pipe to the required length. The main steps include:
1. Uncoiling: Unroll the steel strip from the drum and level it through the straightener.
2. Forming: The steel strip is rolled into a tube shape through a series of roller wheels.
3. Welding: high frequency current is used to heat the joint of the steel strip, so as to weld the steel pipe.
4. Cooling: The welded steel pipe is cooled by cooling equipment.
5. Straightening and cutting: Finally, straighten and cut the steel pipe to the required length.
The main steel pipe used in the highway fence needs to have a certain strength and impact resistance, but also corrosion resistance. Specific features include:
1. High strength: the steel pipe must be able to withstand the impact to ensure the safety of the highway.
2. Corrosion resistance: steel pipes are usually galvanized to enhance their corrosion resistance and adapt to harsh outdoor environments.
3. Standard size: The steel pipe produced generally has strict size requirements to ensure the stability of the fixed connection of each fence.
The steel pipe produced by the 89 pipe welding machine plays a skeleton role in the highway fence, and its application is reflected in:
1. Guardrail: installed on both sides of the highway or in the middle, to prevent the vehicle from losing control of the road, to protect the safety of the driver.
2. Isolation belt: Set isolation belts between lanes in different directions to prevent vehicles from crossing lanes and reduce the incidence of accidents.
3. Sound barrier: The use of steel pipe frame to support the sound barrier plate to reduce the impact of road noise on the surrounding environment.
In short, the 89 pipe welding machine plays a key role in the production of steel pipes for highway fences, ensuring the stability, durability and safety of the fences, thus providing a reliable guarantee for the safe operation of the highways.
For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier:www.usedpipemill.com
JinYuJie-Used Pipe Mills Supplier(Please click the link→) :second-hand pipe mill
89 The working principle of the pipe welding machine 89 The pipe welding machine uncoils the steel strip, feeds and welds it into a round steel pipe, and then cools, straightens and cuts the steel pipe to the required length. The main steps include:
1. Uncoiling: Unroll the steel strip from the drum and level it through the straightener.
2. Forming: The steel strip is rolled into a tube shape through a series of roller wheels.
3. Welding: high frequency current is used to heat the joint of the steel strip, so as to weld the steel pipe.
4. Cooling: The welded steel pipe is cooled by cooling equipment.
5. Straightening and cutting: Finally, straighten and cut the steel pipe to the required length.
The main steel pipe used in the highway fence needs to have a certain strength and impact resistance, but also corrosion resistance. Specific features include:
1. High strength: the steel pipe must be able to withstand the impact to ensure the safety of the highway.
2. Corrosion resistance: steel pipes are usually galvanized to enhance their corrosion resistance and adapt to harsh outdoor environments.
3. Standard size: The steel pipe produced generally has strict size requirements to ensure the stability of the fixed connection of each fence.
The steel pipe produced by the 89 pipe welding machine plays a skeleton role in the highway fence, and its application is reflected in:
1. Guardrail: installed on both sides of the highway or in the middle, to prevent the vehicle from losing control of the road, to protect the safety of the driver.
2. Isolation belt: Set isolation belts between lanes in different directions to prevent vehicles from crossing lanes and reduce the incidence of accidents.
3. Sound barrier: The use of steel pipe frame to support the sound barrier plate to reduce the impact of road noise on the surrounding environment.
In short, the 89 pipe welding machine plays a key role in the production of steel pipes for highway fences, ensuring the stability, durability and safety of the fences, thus providing a reliable guarantee for the safe operation of the highways.
For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier:www.usedpipemill.com
JinYuJie-Used Pipe Mills Supplier(Please click the link→) :second-hand pipe mill

Time of issue : 2025-01-23
1.Supply channels:
Online marketplaces: For example, Taobao, Alibaba, Jingdong and other platforms can search and find used equipment.
Professional used equipment market: Some areas have a special used equipment market, you can view the equipment situation on the spot.
Industry exhibitions: Participate in machinery, manufacturing related exhibitions, sometimes you can find suppliers to provide second-hand equipment opportunities.
Peers and recommendations: Ask peers and friends in the industry to obtain reliable equipment and supplier information.
2.Selection criteria:
Equipment condition: Carefully check the service life, maintenance records and running status of the equipment to ensure that the function is intact.
Brand and model: Choose well-known brands and reliable models, usually the quality is guaranteed, and the after-sales service is relatively perfect.
Price comparison: multiple inquiries to ensure reasonable prices to avoid buying inferior equipment at low prices.
Service and Accessories: Find out if the supplier provides after-sales service and accessories to ensure convenient maintenance in subsequent use.
3.Site inspection:
Equipment operation demonstration: The seller is required to perform equipment operation demonstration to observe the actual operation.
Technical Support: Evaluate the seller's technical support capabilities, including whether to provide installation and commissioning services.
Contract protection: Sign a detailed procurement contract to clarify the responsibilities of both parties, equipment specifications, payment methods, after-sales service and other content.
4.Trial Period:
Trial commitment: Try to strive for a certain trial period in order to find potential problems with the equipment during use.
Troubleshooting: During the trial period, pay close attention to the operation of the equipment, if there is a failure, contact the seller as soon as possible.
Through the above methods, you can better purchase a satisfactory second-hand pipe making machine.
For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier:www.usedpipemill.com
JinYuJie-Used Pipe Mills Supplier(Please click the link→) :second-hand pipe mill
1.Supply channels:
Online marketplaces: For example, Taobao, Alibaba, Jingdong and other platforms can search and find used equipment.
Professional used equipment market: Some areas have a special used equipment market, you can view the equipment situation on the spot.
Industry exhibitions: Participate in machinery, manufacturing related exhibitions, sometimes you can find suppliers to provide second-hand equipment opportunities.
Peers and recommendations: Ask peers and friends in the industry to obtain reliable equipment and supplier information.
2.Selection criteria:
Equipment condition: Carefully check the service life, maintenance records and running status of the equipment to ensure that the function is intact.
Brand and model: Choose well-known brands and reliable models, usually the quality is guaranteed, and the after-sales service is relatively perfect.
Price comparison: multiple inquiries to ensure reasonable prices to avoid buying inferior equipment at low prices.
Service and Accessories: Find out if the supplier provides after-sales service and accessories to ensure convenient maintenance in subsequent use.
3.Site inspection:
Equipment operation demonstration: The seller is required to perform equipment operation demonstration to observe the actual operation.
Technical Support: Evaluate the seller's technical support capabilities, including whether to provide installation and commissioning services.
Contract protection: Sign a detailed procurement contract to clarify the responsibilities of both parties, equipment specifications, payment methods, after-sales service and other content.
4.Trial Period:
Trial commitment: Try to strive for a certain trial period in order to find potential problems with the equipment during use.
Troubleshooting: During the trial period, pay close attention to the operation of the equipment, if there is a failure, contact the seller as soon as possible.
Through the above methods, you can better purchase a satisfactory second-hand pipe making machine.
For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier:www.usedpipemill.com
JinYuJie-Used Pipe Mills Supplier(Please click the link→) :second-hand pipe mill
Wechat: 13392281699
Email: zty@usedpipemill.com
Company address:No. A99, East Lecong Avenue, Lecong Town, Foshan City, Guangdong Province
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Tel (wechat): 13336487288
Wechat:+86 13336487288
WhatsApp:+86 13336487288
Email: zty@usedpipemill.com
Address: No. A99, Lecong Avenue East, Lecong Town, Foshan City, Guangdong Province
