HFIS-400C Precision Spot Welding Machine Product Overview Different metal materials require specific spot welding processes. The HFIS-400C precision spot welding machine is engineered for applications where material type, weld position, and joint consistency must be considered together. Beyond common steel and stainless steel welding, this machine handles non-ferrous metals including copper, silver, nickel, and their alloys. For automotive manufacturing, it's suitable for