Effect of pipe welding(2)

(1) penetration type (orifice), plasma arc welding: the use of plasma arc small diameter structural steel pipe, high temperature, energy density, the penetrating power of the characteristics of appropriate process parameters (welding current 100A ~~ 500A), the weldment completely penetration, and the force of the ion current, the formation of a penetration welding holes, and ejected from the back of the weldment part of the plasma arc, plasma arc welding. Can be one-side welding forming, the most suitable for welding 3 to 8 mm stainless steel, less than 12 mm titanium, 2 to 6 mm low carbon steel or low alloy structural steel pipe and copper, brass, nickel and nickel alloy butt welding. (Plate thick, by plasma arc energy density limit, formed holes difficulties; board is too thin, the holes can not be completely closed by the liquid metal, solid can not be achieved holes welding method.)

(2) penetration type (integrated into the type) such as plasma arc welding: the smaller the welding current (30A ~ 100A) and lower such as plasma gas flow rate, using the method of hybrid plasma arc welding. The formation of holes effect. Mainly used for sheet metal (0.5 to 2.5 mm), welding, multi-pass welding of the layers in the back cover after the bead welding and fillet weld the welding.

(3) micro-plasma arc: arc welding current is 30A below ion. The nozzle diameter is small (Φ0.5 ~ Φ1.5 mm), needle-like small plasma arc. Mainly used for welding of 1 mm below the ultra-thin, ultra-small, precision welded mild steel pipe.