... Automatic Root Pass, Fill and Cap Pass Welding Machine 1) Welding efficiency: 280-500D. I/8hrs. Automatic Root Pass, Fill and Cap Pass ... TOWER, etc.Reference: CCC, L&T, PEC, Rotary Engineering, Petrol Steel, CNPC, SINOPEC, CNOOC, CNCEC, etc.Features:1, Realize automatic ... Pipe root pass, fill and cap pass, when integrated with mature welding technology TIG ...