Welding points for stamping elbows

The welding points for stamping elbows are as follows:

1. To improve the corrosion resistance and weldability, appropriate amounts of non disruptive elements such as Ti, Nb, Mo should be added. When using the same type of chromium stainless steel welding rod, preheating at 200 ℃ or above and tempering treatment at around 800 ℃ after welding should be carried out. If the welded parts cannot undergo heat treatment, chromium nickel stainless steel welding rods should be used.

2. To prevent eye erosion caused by heating, the welding current should not be too high, about 20% less than that of carbon steel welding rods. The arc should not be too long, and the interlayer should be cooled quickly. Narrow weld beads are preferred.

3. Stamping elbows have high hardenability after welding and are prone to cracking. If the same type of stamped elbow is used for welding, preheating at 300 ℃ or above and slow cooling treatment at around 700 ℃ after welding must be carried out. If the welded parts cannot undergo post weld heat treatment, stamped elbow welding rods should be used.