TIG MIG Joint Steel Plate Butt Welding Machine

According to the working principle of butt welding machines, butt welding processes can be divided into two types: resistance butt welding and flash butt welding:

Resistance butt welding is the process of heating the end joints of steel bars to a plastic state, cutting off the power supply, and then heating them to achieve a plastic connection. This welding process is prone to oxidation and slag inclusion at the joint area, and requires the cross-section of the steel bar to be smooth and flat. At the same time, it consumes a lot of electricity during welding and requires high welding machine power, so it is rarely used.

Flash butt welding refers to the process of spraying molten metal particles from the joint of the steel bar end during welding, presenting sparks (i.e. flash). At the same time as molten metal is sprayed out, oxides and slag inclusions are also carried out, which improves the quality of welded joints and is widely used, especially for the butt joint of low-carbon steel and low alloy steel.

2. The following precautions should be taken when using a butt welding machine:

Adjust the distance between the two jaws. When turning the adjustment screw to make the control lever at the left limit, the distance between the jaws should be the difference between the total extension length and extrusion amount of the two welded parts. When the control lever is at the right limit, the distance between the jaws should be the total extension length of the two welded parts plus 2-3mm, which is the original position before welding.

Adjust the short-circuit limit switch to automatically cut off the power supply when the welding is completed (reaching the predetermined extrusion amount).

Adjust the jaws according to the shape of the weldment, so that both jaws are at the same level, and then clamp the weldment.

To prevent instantaneous overheating of the welded part, the adjustment stages should be increased step by step during the trial welding, and an appropriate secondary voltage should be selected. When flash butt welding, it is advisable to use a higher secondary voltage.

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