Hello, my name is Chris Vanheule, and I am a Manufacturing Engineering student at Fanshawe College in London, ON Canada. For my english course in need to finish a technical report on Resistance Welding. One of the criteria of the report is a interview (internet is good enough) with a expert in the field. Could some one be so kind to help me.

All I am looking for is this question to be answered:

- What is the hardest part of resistance welding?

Thanks