Discussion
The voltage needed in resistance welding does not depend upon:
Answer: D
The voltage does not depend on the length of weld.
In resistance welding the voltage only has to drive the welding current through the resistance at the joint. That resistance is set by the composition of the metal (its resistivity), the area of contact the current passes through, and the thickness of the parts being joined.
The overall length of a weld is made up by making more spots or running the seam further; each spot or section is welded under the same conditions, so the length does not change the voltage required. Composition, area and thickness all do, which is why they are wrong answers here.
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