Application of high speed pulse MIG welding machine on 316L stainless steel
The welding heat exchanger 316L stainless steel spiral plate Shandong chemical equipment company, 316L stainless steel is austenitic stainless steel, which is characterized by low heat conductivity, linear expansion coefficient, easy to produce hot cracking in the welding process, there will be a large deformation and welding stress. The traditional 316L stainless steel welding, the argon arc welding (TIG), manual electric arc welding (GTAW) or cored wire gas shielded arc welding (TCAW). Argon arc welding and manual electric arc welding speed, low production efficiency; flux cored wire welding has high speed, but the flux cored wire and high price.
In recent years, the welding process of stainless steel welding equipment, although the continuous improvement and development, but how to control the welding of 316L stainless steel when the line energy is too large, easy to cause the precipitation of carbides and intergranular corrosion of 316L stainless steel welding, is the key to success, to perfect the welding of 316L stainless steel, must the small current, fast welding the arc; concentrated, have good penetration.
A drop in pulsed MIG welding 316L stainless steel welding arc when the concentration difference, high arc voltage, line energy input is too large, easy to cause the weld carbides and embrittlement of weld, when cleaning will appear black.
Using high-speed pulse MIG welding machine, Sichuan Morrow Welding Development Co., Ltd., production of the model DSP-350, with a diameter of 1.2/ER316L pressure equipment stainless steel solid core welding wire, welding current 120A, welding voltage 21.5V, using 97.5%Ar 2.5%CO2 as protective gas. After welding, the welding quality inspection, the qualified rate is high, very satisfied with the user.