Analysis of Welding Process Parameters of ERW High Frequency Welded Pipe

During the welding process of high frequency welded pipes(ERW Pipe), it is necessary to select suitable process parameters according to different production requirements. First, during the welding process, the distance between the two stages and the distance between the electrode and the centerline of the squeeze roller should be shortened as much as possible. For deburring square pipes, for example, when producing pipes below 25.4mm, this distance is generally equal to 1.2-1.5 times the outer diameter of the pipe.

If this distance is set unreasonably, it may reduce the strength of the ERW high frequency welded pipe weld and the welding speed, which will affect the quality of the welding. However, if the distance is shortened, the effective heating time will be shortened, resulting in insufficient edge heating and affecting the strength of the weld. The second is to meet the requirements of mounting feet and solder feet. In order to realize the efficient use of high-frequency current and reduce the consumption of a large amount of high-frequency current on the output transformer and the hanging feet, when installing the hanging feet, first ensure the material, use copper screws and copper pressure plates, and place them on the transformer and the hanging feet. The contact area needs to be polished and polished to make surface contact and reduce the heat generated by the feet.

In addition, the width process requirements and parameter requirements of the heat-affected zone during welding should also be met. Under normal circumstances, when welding ERW high-frequency welded pipes, the welding process for the ideal welding result, except that there must be enough metal on the edge of the strip to become liquid in order to get a good fusion result; and then there is melting at the weld. The object and its two fusion lines to the heat-affected zone. Practice has proved that if the melt itself and the melt line are distorted, the weld quality will be poor.

Next, the process parameters such as the welding temperature, speed, and extrusion force of ERW high-frequency welded pipes need to be reasonably controlled. In the welding process, the welding temperature is an important indicator. The low welding temperature leads to the insufficient heat required for welding, resulting in low-temperature welding. The two states of the tube blank to be welded are in partial melting. As a result, the pipe blank is carried out under plastic conditions, and the metal substance in the oxidized state is not easily discharged from the weld, resulting in quality defects.

In short, the control of welding process parameters will directly affect the welding strength and other properties of welded pipe products. In the actual application process, it is necessary to select appropriate process conditions according to different situations, and clearly understand the relationship between welding speed, welding frequency and steel pipe diameter.