... 1.Mma welding machine: Arc Welder 2.High efficiency,energy saving, 3.Easy operation,economic, 4.durable, reliable, portable. Mma welding machine: Arc ... in output current,smooth in electrical arc and the welding seams is always formed in elegant shapes and ... and arc ending, which guarantee the best welding quality.5)Its dependable protection against the Imperfect Phase, voltage exceeding norm ...