... proof welding machine 1)less sparks, smooth welding seam, easy to use and running reliable etc. 2)soundproof Sound proof welding ... less sparks, smooth welding seam, easy to use and running reliable etc. Besides, this machine can supply alternating current ... welding Current range: 45-180A Generator: single phase rated output: 3kva rated frequency: 50Hz rated voltage: 220V Sound proof welding machine ...