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Used round tube forming machines, the main points of welding quality (2)

Used round tube forming machines, the main points of welding quality (2)

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  • Release time:2022-02-04 11:30
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【概要描述】There are many factors that affect the welding quality of used round tube forming machines, and these factors interact and restrict each other in the same system.

Used round tube forming machines, the main points of welding quality (2)

【概要描述】There are many factors that affect the welding quality of used round tube forming machines, and these factors interact and restrict each other in the same system.

  • Sort:Information
  • Auth:
  • Source:
  • Release time:2022-02-04 11:30
  • Pvs:
Detail

There are many factors that affect the welding quality of used round tube forming machines, and these factors interact and restrict each other in the same system.

 

When one factor changes, other factors will also change as it changes. Therefore, in the high frequency adjustment, it is not enough to pay attention to the local adjustment of the frequency, power, current or squeeze amount of the used round tube forming machines.

 

This adjustment must be based on the specific conditions of the entire molding system, comprehensively considered from all aspects related to high-frequency welding, and adjusted by excluding all influencing factors one by one.

 

Below we break down the main factors in the high-frequency welding process, there are the following eight aspects, we will introduce ③Welding method. ④ Input power.

 

③ Welding method

There are two ways of high frequency welding: contact welding and induction welding

 

Used round tube forming machines

 

contact welding

 

Used round tube forming machines

 

induction welding

 

In contact welding, a pair of copper electrodes are in contact with the two sides of the material being welded, and the induced current has good penetration. The two effects of high-frequency current (proximity effect & skin effect) are maximized due to the direct contact between the copper electrode and the steel plate Utilization, so the welding efficiency of contact welding is higher and the power consumption is lower. It is widely used in the production of high-speed and low-precision pipes. It is generally necessary to use contact welding when producing particularly thick welded pipes.

 

However, contact welding has two disadvantages: one is that the copper electrode is in contact with the steel plate and wears quickly. Second, due to the influence of the flatness of the surface of the steel plate and the straightness of the edges, the current stability of contact welding is poor, and the internal and external burrs of the weld are relatively high. It is generally not used when welding high-precision welded pipes.

 

Used round tube forming machines

 

Induction welding is to wrap one or more turns of induction coil outside the welded steel pipe. The effect of multi-turn is better than single-turn, but it is more difficult to make and install multi-turn induction coil.

 

Used round tube forming machines

 

When using induction welding, a small distance between the induction coil and the surface of the steel pipe is more efficient, but it is easy to cause discharge between the induction coil and the pipe. At the same time, if the shape is irregular, the induction coil will be easily scratched if the gap is too small. Generally, the induction should be maintained A gap of 5-8mm between the coil and the surface of the steel pipe is appropriate.

When using induction welding, because the induction coil does not contact the steel plate, there is no wear and the induced current is relatively stable, which ensures the stability of the weld during welding, and the welded steel pipe has good surface quality and smooth welds.

 

④ Input power

Input power control during high-frequency welding is very important, and constant and stable input power is even more important. If the power is too low, the billet groove heating is insufficient, and the welding temperature cannot be reached, which will cause unwelded defects such as false welding, desoldering, and pinch welding; when the power is too high, the welding stability will be affected, and the billet groove surface will be heated. The temperature is much higher than the temperature required for welding, causing serious splashes, pinholes, slag inclusions and other defects. This type of defect is called an overburning defect.

 

The input power during high-frequency welding should be adjusted and determined according to the pipe diameter, pipe wall thickness, forming unit speed, and whether to remove internal burrs. Different molding methods, different unit equipment, different metal materials, different steel grades, and even different batches of raw materials will have an impact. This needs to be considered comprehensively, summarized from the first line of production, and compile a high Frequency welding process.

 

Therefore, if you fully understand that the welding method and input power will affect the welding quality of the used round tube forming machines, it is necessary to analyze other aspects of the welding quality of the used round tube forming machines before you can summarize the method. The next issue will introduce the ⑤ tube Billet groove. ⑥ welding speed. If necessary, you can continue to pay attention to us.

 

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