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Seam welding

Joining process where two sheets are welded by heat and pressure created by two circular electrodes constantly moved over the material.

Illustration of Seam welding

The process

The method is similar to spot welding with the difference that the bar-shaped electrodes are now replaced by metal rollers that continuously moves along with the two workpieces. Metal rollers profile must be designed in accordance with the contour to be welded.

Two plates are placed next to each other and are pushed together by two metal rollers, which act as electrodes and are connected to a power source. The rollers then compress the plates and pass a current through the two workpieces.

The result is that the material is melted at the contact point [1] due to the large thermal energy generated by the current and pressure. The rollers maintain pressure on the electrodes along with the material, and this causes the contact point to move at the same speed and direction. It is important that the contact point has time to merge and partly cool before the electrodes are moved on. Power is not cut until the whole seam is welded.

Spot welding
Joining process where two sheets are joined by heat and pressure created by two conductive electrodes.
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