portable 110V and 220V welder with multifunctions: MMA, TIG,PULSE TIG,MIG,PULSE MIG,DOUBLE PULSE MIG 1).Dual voltage(110V ... and self-switch over2).6 function in 1: mma,tig,pulse tig,mig,pulse mig and double pulse mig.3).High frequency ... arc stating methods for tig welding4).Alternative wire feeding methods for MIG welding: pull and ...