Precautions for stainless steel stamping elbow
1. The welding rod shall be kept dry when it is used. The titanium calcium type shall be dried at 150 ℃ for 1 hour, and the low hydrogen type shall be dried at 200-250 ℃ for 1 hour (repeated drying is not allowed, otherwise the coating is easy to crack and peel off), so as to prevent the coating from sticking oil and other dirt, so as not to increase the carbon content of the weld and affect the quality of the weldment.
2. In order to prevent eye to eye corrosion caused by heating, the welding current should not be too large, about 20% less than that of carbon steel electrode, the arc should not be too long, the interlayer should be cooled quickly, and the narrow weld bead is preferred.
3. For the purpose of improving the corrosion resistance and weldability of stainless steel stamping elbow, appropriate amount of stable elements Ti, Nb, Mo, etc. shall be added. The weldability of stainless steel stamping elbow is better than that of stainless steel stamping elbow. When the same type of chromium stainless steel electrode is used, preheating above 200 ℃ and tempering at 800 ℃ after welding shall be carried out. If the weldment cannot be heat treated, chromium nickel stainless steel electrode shall be used.
4. Stainless steel stamping elbow coating has titanium calcium type and low hydrogen type. Titanium calcium type can be used in AC and DC, but the penetration of AC welding is shallow, and it is easy to turn red, so DC power supply should be used as far as possible.
5. When stainless steel stamping elbow is welded, carbide is precipitated by repeated heating, which reduces corrosion resistance and mechanical properties.
6. Stainless steel stamping elbow electrode has good corrosion resistance and oxidation resistance, which is widely used in chemical industry, chemical fertilizer, petroleum, medical machinery manufacturing.
