Electric resistance welding (ERW) is a process by which metal can be joined by applying pressure and heating the joining ends by passing strong electric current. Different resistance welding methods are :
Spot welding
Seam welding
Butt welding
Projection welding
Spot welding
In spot welding, a weld spot is produced by passing electric current to the area to be joined which is kept between the electrodes usually made from copper based alloys. This method is extensively used in automotive industry for joining of steel and in the aerospace industry for airframe components made from aluminium alloys.
Seam welding
It is a variation of spot welding in which instead of single spots, a number of overlapping spots are produced. The conventional spot welding electrodes are replaced by wheels. The joint area is passed between the electrode wheels and thus produces a continuous welded seam.
Seam welding is often used in the production of thin sheet, leak-tight
containers such as fuel tanks and is generally unsuitable for welding
aluminium.
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