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Q. Define Heat for electrical resistance welding?
The heat, H for electrical resistance welding is generated by passing a large electrical current ( of the order of 3000 to 100,000 Amps with a voltage between 1 and 25 volts) through two pieces of metal that are touching each other.
H=I2 RT
Where H is the heat generated indicated in joules,
I is the current in root-mean-square amperes, R is the resistance in ohms,.
T is the time (from fraction of a second Tc a few seconds) of current flow through the pieces to be welded.
Stitch Welding This is a variation of spot welding, in which a series of overlapping spot welds are made in the same manner as stitching cloth. Stitch welding may be performed
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