About this item 4-IN-1 MIG Welder: The welder machine offers GAS MIG/Flux Core MIG/Lift TIG/ MMA welding modes (Note: WP-17V TIG torch must be purchased separately). It can easily handle welding stainless steel, carbon steel, and even thicker steel materials, meeting diverse welding requirements. TECHNICAL UPGRADE: This welding machine features upgraded MCU and IGBT technologies, enabling users to precisely adjust parameters for Synergy MIG (plate thickness, voltage, welding