2021-12-11
1, in order to guard against the occurrence of sunny erosion due to heating, welding current should not be too sticky, less than 20% of carbon steel electrode, arc should not be too long, fast cooling between layers, narrow pass is appropriate. 2, stainless steel pipe fittings after welding hardening is sticky, easy to crack. If the acceptance of typical stainless steel pipe fitting welding, it is necessary to carry out more than 300℃ preheating and after welding 700℃ at the mercy of slow cooling disposal. If the weldment cannot be heat disposed after welding, stainless steel tube electrode should be used. 3, stainless steel pipe fittings, in order to improve the corrosion resistance and weldability and add appropriate amount of invariable elements Ti, Nb, Mo, weldability is better than stainless steel pipe fittings. The acceptance of typical chromium stainless steel electrode, should be more than 200℃ preheating and after welding 800℃ temper disposal. If the weldment can not be heat disposed, chromium nickel stainless steel electrode should be used. 4, stainless steel pipe welding rod has exquisite erosion resistance and oxidation resistance, widely used in chemical industry, chemical fertilizer, petroleum, medical machinery manufacturing. 5, stainless steel pipe fitting skin titanium calcium type and low hydrogen type. Titanium-calcium type can be used for AC and DC, but the welding depth is shallow when AC welding, and it is convenient to redness, so the dc power supply is generally accepted.
