The water cooled Plasma-TIG Welding System was designed by VEGA Engineering Corporation specially for stainless steel tube welding. This system can be applied with a single torch, twin torches and tir-cathode torches according to different thickness with outstanding speed and quality welding bead. The sealed machine case and power block water cooled design can prevent the system from being polluted by dust and acid in the air and therefore prolongs its life circle remarkably.