... tank,tube union,flange,muffler,air reservoir,air compressor,etc.Welder is pneumatic controlled and weldment is on the support rollers ... width.Every lap electric current and voltage can be present,Arc starting and extinguishing electric current is controlled by program,which ... pretty seam and substantially increased work efficiency.Adapting weldor:argon-arc welding,gas shielded welding ,hidden ...