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GYS Protig 200 AC/DC Welding Machines The PROTIG 200 AC/DC (200 A) is a compact, portable and versatile dual-process unit for AC/DC TIG welding and coated-electrode (MMA) welding. It can be used to join all types of material up to 4 mm thick (steel, stainless steel, aluminium, copper, magnesium and even titanium). Its advanced, secondary regulation guarantees optimal arc stability and a constant welding current in all positions.