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Weld quality failure caused by used welded pipe units (3)
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- Release time：2022-03-05 11:30
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【概要描述】When manufacturing welded pipes for used welded pipe units, judging that the quality of the welded pipes meets the standard depends on the quality of the welds. Therefore, the quality of the weld is very important, so sometimes it is necessary to rule out the quality of the weld. We perform analyses to understand weld quality failures.
Weld quality failure caused by used welded pipe units (3)
【概要描述】When manufacturing welded pipes for used welded pipe units, judging that the quality of the welded pipes meets the standard depends on the quality of the welds. Therefore, the quality of the weld is very important, so sometimes it is necessary to rule out the quality of the weld. We perform analyses to understand weld quality failures.
- Sort：Information
- Auth:
- Source:
- Release time：2022-03-05 11:30
- Pvs：
Detail
When manufacturing welded pipes for used welded pipe units, judging that the quality of the welded pipes meets the standard depends on the quality of the welds. Therefore, the quality of the weld is very important, so sometimes it is necessary to rule out the quality of the weld. We perform analyses to understand weld quality failures.
These weld quality failures will occur when the used welded pipe units is making pipes: ① through-length lap welding. ② Periodic lap welding. ③ Open the seam. ④ Trachoma. ⑤ Peach-shaped tube. ⑥ Weld seam gnawed. ⑦Outer burr planing. ⑧ Heating. ⑨ The current is small. ⑩ Melting of induction coils and electrodes. ⑪ Fire. ⑫ "No high pressure" phenomenon. We can summarize 12 causes of weld quality failures.
Slit
Slitting refers to the phenomenon that the welds are not bonded together. The length of the slits is generally more than a few centimeters or even longer. The main reasons are as follows:
(1) The hole type is worn. With the wear of the extrusion roll pass, the R dimension of the pass gradually increases. When the hot-rolled steel strip is used as the raw material for the welded pipe, when the width of the steel strip has a negative deviation or the steel is slightly stretched, the quality of the weld will have problems. production. Therefore, it is necessary to constantly check the internal burr of the welded pipe, increase the extrusion amount of the squeeze roller, or replace the new hole type in time.
(2) The bearing is damaged. When the bearing of the squeeze roller is only slightly damaged, there will be weld quality problems such as trachoma tubes and lap welded tubes. The seam becomes a fully open shape, accompanied by other quality accidents. At this time, we can also observe the squeeze roller with damaged bearing, and the swing amplitude will become larger as the degree of bearing damage increases.
(3) Magnet (resistor). The magnetic bar will form a magnetic field during the welding process of the tube blank, and the high-frequency current can be highly concentrated in the "V"-shaped area of the welding seam, so that the welding seam can reach a high temperature point in a very short time. If there is no magnetic rod in the tube, it will have a great influence on the proximity effect and skin effect of high-frequency current. The most obvious feature is that the welding seam is black and red, without splashing sparks, and the welding seam is fully open. Sometimes even if it is welded, it is false welding, and the popping sound of the horn will occur when the pipe is sizing. If the magnet bar fails or the installation position is not suitable, the welded pipe will burst, even if it does not crack, its strength is very low. At this time, the weld is generally yellow or light blue cracking due to insufficient hot spot temperature.
(4) Raw material . Due to the chemical composition of the raw materials, although it is relatively normal during the welding process, the weld will still crack. At this time, the color of the weld is relatively blue, indicating that the temperature is still normal. Sometimes we can see that the crack of the weld deviates from the center of the weld, which is to stick the edge of the base metal to form an irregular seam, which is purely a brittle crack caused by the chemical composition of the raw material.
The above is one of the reasons for the quality failure of the welding seam when the used welded pipe units is making pipes, which is the opening of the seam. The main reasons for the formation of slits are (1) wear of the hole type. (2) The bearing is damaged. (3) Magnetic rod (impedance device). (4) Raw materials.
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1.Theoretical Training:
Equipment knowledge: Understand the basic components of the slitting unit and its working principle.
Operation specifications: Familiar with the operation procedures, including starting, stopping, adjusting parameters, common problem handling, etc.
Safety training: Understand the safety risks in equipment operation and corresponding preventive measures, and be familiar with emergency handling methods in emergency situations.
2.Practical operation:
On-site operation demonstration: An experienced operator gives a demonstration on site to guide new employees to master basic operating skills.
Hands-on practice: Let new employees operate the equipment themselves, accumulate experience in actual operation, and solve the problems encountered.
3.Maintenance:
Daily inspection: Train employees to understand the contents and methods of daily inspection of equipment, including cleaning, lubrication, fastening and other work.
Troubleshooting: Teach employees how to identify common equipment failures, understand basic troubleshooting methods and when professional maintenance personnel are required to intervene.
4.Efficiency optimization:
Production Management: Explain how to rationally arrange production tasks to improve equipment utilization and production efficiency.
Data Analysis: Teach employees how to record and analyze production data to find and improve the weak links in production.
5.Assessment and continuous improvement:
Assessment: Evaluate the effectiveness of training through examinations or practical assessments to ensure that employees have the necessary knowledge and skills.
Continuous improvement: Regularly organize training review and skill upgrading courses, and constantly improve the training content according to the actual production and equipment update.
After the training, new employees can work under the supervision of an experienced operator until they are fully competent.
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.Theoretical Training:
Equipment knowledge: Understand the basic components of the slitting unit and its working principle.
Operation specifications: Familiar with the operation procedures, including starting, stopping, adjusting parameters, common problem handling, etc.
Safety training: Understand the safety risks in equipment operation and corresponding preventive measures, and be familiar with emergency handling methods in emergency situations.
2.Practical operation:
On-site operation demonstration: An experienced operator gives a demonstration on site to guide new employees to master basic operating skills.
Hands-on practice: Let new employees operate the equipment themselves, accumulate experience in actual operation, and solve the problems encountered.
3.Maintenance:
Daily inspection: Train employees to understand the contents and methods of daily inspection of equipment, including cleaning, lubrication, fastening and other work.
Troubleshooting: Teach employees how to identify common equipment failures, understand basic troubleshooting methods and when professional maintenance personnel are required to intervene.
4.Efficiency optimization:
Production Management: Explain how to rationally arrange production tasks to improve equipment utilization and production efficiency.
Data Analysis: Teach employees how to record and analyze production data to find and improve the weak links in production.
5.Assessment and continuous improvement:
Assessment: Evaluate the effectiveness of training through examinations or practical assessments to ensure that employees have the necessary knowledge and skills.
Continuous improvement: Regularly organize training review and skill upgrading courses, and constantly improve the training content according to the actual production and equipment update.
After the training, new employees can work under the supervision of an experienced operator until they are fully competent.
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
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Time of issue : 2024-12-04
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Position selection: According to the layout and process requirements of the production line, the installation position of the looping clip motor is reasonably selected.
Fixed and connected: Install the motor firmly in the designated position, and connect it with the corresponding mechanical transmission components.
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Check before starting: Check the lubrication state of the motor and transmission parts, whether the fasteners are loose, and whether the electrical line is normal.
Smooth start: When starting the motor, it should avoid the impact of instantaneous large current, and use soft start or frequency conversion start.
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Fault diagnosis: When there is a fault, professional detection equipment is used to diagnose the motor and determine the cause of the fault.
Timely repair: Repair or replace the fault part according to the diagnosis results to ensure that the equipment returns to normal work as soon as possible.
In short, the correct use and maintenance of the looper clip motor is crucial to ensure the efficient and stable operation of the metal processing line.
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.Installation and commissioning:
Position selection: According to the layout and process requirements of the production line, the installation position of the looping clip motor is reasonably selected.
Fixed and connected: Install the motor firmly in the designated position, and connect it with the corresponding mechanical transmission components.
Electrical wiring: Correct wiring to ensure reliable connection between the motor and the control system.
2.Start and Stop:
Check before starting: Check the lubrication state of the motor and transmission parts, whether the fasteners are loose, and whether the electrical line is normal.
Smooth start: When starting the motor, it should avoid the impact of instantaneous large current, and use soft start or frequency conversion start.
Normal shutdown: The shutdown should gradually reduce the speed of the motor to prevent sudden stop from impacting the equipment.
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Constant tension: The tension control system is used to maintain a constant tension during the operation of the looping motor to avoid strip relaxation or pulling.
Speed synchronization: Adjust the running speed of the motor according to the process requirements, so that it matches the speed of the equipment before and after the process.
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Regular inspection: Regularly check the wear of the motor and transmission parts, and replace the damaged parts in time.
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Clean and dust-proof: Keep the motor and control cabinet clean to prevent dust and debris from entering, affecting the performance of the equipment.
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Fault diagnosis: When there is a fault, professional detection equipment is used to diagnose the motor and determine the cause of the fault.
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For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier：www.usedpipemill.com
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Cleaning: Remove oil, dust and so on from the surface.
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For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier：www.usedpipemill.com
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1.Basic construction: A typical roller type bedroom spiral hoop usually consists of two sets of rollers that form a spiral shaped channel for guiding and supporting the metal strip.
2.Operation principle: When the metal strip passes through the looper, the strip is guided and supported in the spiral path. Due to the spiral structure of the looper, the strip can be smoothly transmitted under the condition of uneven strip speed to ensure the normal progress of the subsequent process.
3.Commissioning and maintenance: Used equipment needs to be inspected and maintained in detail before use. Includes:
Cleaning: Remove oil, dust and so on from the surface.
Lubrication: Check and add lubricating oil to ensure the normal operation of each transmission component.
Calibration: Ensure that the neutralization pressure of the roller is set correctly.
Replacement parts: Check for wear and replace necessary parts.
4.Application process: In the process of use, it is necessary to pay attention to the operation specifications, monitor the operating status of the equipment, and adjust the equipment parameters in time to meet the strip specifications and process requirements. In addition, it is also necessary to pay attention to safe operation to prevent accidents.
Through the above methods, the used roller bedroom spiral looper can continue to play its function and provide support for metal processing production.
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Each mold plays an important role in the production process, ensuring the quality and production efficiency of the welded pipe. According to the specific use and needs, different types of molds can be combined to achieve the best production results.
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.Molding die: used to shape steel strip into pipe. This type of mold usually consists of multiple sets of rollers, and the forming process is completed by gradual pressure.
2.Welding die: Specially used for high-frequency welding process to ensure the quality and accuracy of the weld. These molds are often used to ensure that the joint parts of the pipe are precisely aligned and soldered securely.
3.Sizing die: used for further sizing and straightening of the pipe after welding to ensure the dimensional accuracy of the final product. These molds allow the pipe to achieve the desired diameter and roundness.
4.Shaping mold: used to shape the welded pipe that has been formed to ensure that it meets the specified size and shape requirements.
5.Straightening mold: used to straighten the welded pipe and correct the bending and deformation of the pipe to ensure its flatness in the production process.
6.Surface treatment mold: These molds are used to treat the surface of the pipe, such as deburring, polishing, etc., to ensure the smooth and smooth surface of the pipe.
7.Cutting mold: used to cut the produced welded pipe to the required length according to demand. The main function of these molds is to ensure that the cutting is straight and high precision.
Each mold plays an important role in the production process, ensuring the quality and production efficiency of the welded pipe. According to the specific use and needs, different types of molds can be combined to achieve the best production results.
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
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Email: zty@usedpipemill.com
Company address:No. A99, East Lecong Avenue, Lecong Town, Foshan City, Guangdong Province
Wechat: 13392281699
Email: zty@usedpipemill.com
Company address:No. A99, East Lecong Avenue, Lecong Town, Foshan City, Guangdong Province
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