Austenitic stainless steel can be used for electrode arc welding, tungsten arc welding, MIG welding, submerged arc welding, etc. When welding austenitic stainless steel, the welding material should be selected correctly, and the welding material with low carbon content and stable element (Nb) should be selected as far as possible to avoid the depletion of chromium at the grain boundary caused by carbide and chrome, thereby improving the resistance of the weld to the grain. inter-corrosion ability; Selecting austenitic stainless steel welding materials containing appropriate amount of ferrite promoting elements (Cr, Mo, Si, etc.) can obtain welds with austenite and a small amount of ferrite dual-phase structure, thereby improving the weldability of austenitic stainless steel welds. Intergranular corrosion resistance and thermal crack resistance; Narrow bead welding technology is adopted, no swing or no swing small swing welding is used as much as possible, and a smaller welding current and a lower arc are used under the condition of ensuring good fusion. voltage, faster welding speed; During the welding process, the temperature of the intermediate layer of the welded parts must be kept low, and if necessary, forced cooling (such as water cooling, air blowing) measures can be taken to control the temperature of the intermediate layer during the welding process and the temperature after welding, and minimize the welding seam Residence time in the range of 450 to 850°C.
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