Resistance Seam Welding
A continuously operating pressure welding process utilizing rotating wheel electrodes to produce leak-tight joint lines on containers and sheet metals. Heating is achieved through consecutive current pulses.
In seam welding, you have two roller electrodes that pull the sheet metal between them. They press the material together and send current pulses through the joint. This generates the heat that welds the seam point by point – the overlapping weld spots then form the continuous, tight seam.
Make sure you don't set the current too high, otherwise the material overheats and the structure becomes coarse and brittle. If the current is too low, you won't get proper penetration and the seam won't hold. So you need to develop a feel for how current, pressure, and feed speed work together – that comes with experience.