Condensate argon arc welding process of stainless steel square tube

The use of condensation pole argon arc welding stainless steel square tube, mainly welding those containing titanium, aluminum, silicon and other elements (with a large affinity for oxygen) of the important stainless steel square tube bracket structure, in order to meet its welding joint mechanical properties and corrosion resistance and other aspects of the request. Because this kind of structure has higher requirements in corrosion resistance or is not allowed to form slag inclusion on the surface of the weld. The starting point of the welding wire is the composition of the welding data, the rigidity of the structure, and the request of the corrosion resistance of the welding joint. In order to reduce the tendency to crack, the hydrogen entering the weld and the stress generated during welding should be minimized.

Stop oil removal and decontamination of stainless steel pipe groove and welding wire before welding. Can be used with similar composition of the base metal welding wire stop condensation polar argon arc welding. When welding stainless steel by condensate argon arc welding, short circuit transition, pulse arc and jet transition can be used. Each of these methods has its application range. Short circuit transition welding can use a diameter of 0.8mm ~ 1.2mm thin wire.

The critical current values are 110A, 180A and 220A for 0.8mm, 1.2mm and 1.6mm wire diameters, respectively. In the jet transition, a gas mixture with less oxidation than the short circuit transition is used. The process parameters of stainless steel square pipe butt joint and T-joint jet transition condensate argon arc welding are shown in Table respectively. In order to avoid finger penetration, the wire can be made small lateral swing or submerged arc welding with double nozzle. In order to improve the corrosion resistance of stainless steel square pipe, the cooling rate should be improved as far as possible. At the same time, it should be noted that the working surface in contact with the corrosive medium should finally stop welding.