Automatic Elbow Welding Machine 1)Zero-balance weight design 2)Automatic root pass, fill, and cap pass Automatic Elbow Welding MachineSuitable for industries of: OIL AND GAS ... "3. TIG/MIG/SAW are optional4. Automatic root pass, fill, and cap pass5. PLC system control, WPS programmed6. More than 99% qualified ...