... mode Current preset function, easy operation Suitable for DC/pulse TIG /manual welding;Gas pre-flowing, delay aspirated;Equipped with ... weld, HF series circumferential weld, longitudinal seam automatic welding;Most suitable for stainless steel, alloy, low carbon steel ... Strong arc stiffness, applicable to all-position TIG welding and sheet metal welding;High reliability for high-frequency arc starting ...