1. DC arc, DC stick, MMA welding. 2. Simple TIG 3. Memory parameter 4. input voltage +15%~- ... start and arc force function, insure enough melting deepness, prevent welding rod from cling to base metal, control splash effectively.4. Have ... work.5. Suitable for all kinds of alkaline, acidic welding rods in welding carbon steel, stainless steel. Apply to shipbuilding, metal structure ...