Mechanical Engineering - Workshop Technology - Discussion

The correct answer is: 1 to 5 volts.

Electric Resistance Welding (ERW) is a process where the heat generated by the electrical resistance of the material being welded is used to melt and join the materials together. The voltage required for ERW is typically in the range of 1 to 5 volts.

Here's why:
- Low voltage is required to generate heat through electrical resistance
- Higher voltages can cause arcing and damage to the equipment or workpiece
- ERW typically uses a high current (in the range of 100-1000 A) to generate the heat needed for welding

The other options are incorrect because:

- 6 to 10 volts: This voltage range is too high for ERW and can cause arcing and damage.
- 11 to 20 volts: This voltage range is also too high for ERW and can cause arcing and damage.
- 50 to 100 volts: This voltage range is much too high for ERW and is typically used for other welding processes like arc welding.

Then, The exact voltage required for ERW can vary depending on the specific application, material, and equipment being used.

Voltage 10 - 20V.
Current 10k - 50k Amp.
thickness< 1 - 2mm.
time 0.01 - 0.5sec.

So, the answer should be C.