... grind type. Light weight, high strength, good stability.4.Using a constant speed beams movements, movements smooth, uniform, high safety ... or operating chairs, along with the mobile arm.7.Using hand-controlled boxes, nose control box(welding control box) ... 7inner welding min.diameter400mm8roller frame5ton9machine weight 4000kg ModelWelding current(A)Welding length(mm)Welding diameter(mm)Welding speed( ...