Industrial Stainless Steel Welding Machine , Water Pump Tank Roll Welder China Industrial Stainless Steel Welding Machin DESCRIPTION Use the roller electrode to replace the cylindrical electrode of spot welding It will generate weld nuggets which will overlap with each other so as to achieve welding effect. AC pulse current or amplitude modulation current will be adopted, but three (single)-phase rectification, medium frequency and high frequency DC are also available. Roll