How to Attach a Nichrome Wire to a Regular Copper Wire?
Attach both wires to opposite ends of larger strip of metal using screws or welding. The attachment strip can be stainless steel or something that will not corrode or otherwise be damaged by the higher temperature at the nichrome attachment point. The attachment strip needs to be large enough so that it does not get too hot from the current and so that temperature at the copper attachment point is acceptable for the copper wire. The copper wire may need a high temperature insulation near the attachment point.