... .Rectangular steel tube welded 2.High tracking accuracy 3.Two-way reciprocating welding LMHZ Submerged Arc Welding Machine Description:The ... of sheet bar, H-beam steel plant welding.2.rack standard rectangular steel tube welded together, light weight, high strength ... accuracy, small size, able to weld dynamic tracking, and two-way reciprocating welding, weld quality assurance, improve work efficency.3. ...