8 Precautions for Stainless Steel Welding

8 Precautions For Stainless Steel Welding

1. Chrome stainless steel

Chromium stainless steel has certain corrosion resistance (oxidizing acid, organic acid, cavitation), heat resistance and wear resistance.

It is usually used for power station, chemical industry, petroleum and other equipment and materials.

Chromium stainless steel has poor weldability, so attention should be paid to the welding process, heat treatment conditions, etc.

2. Chrome 13 stainless steel

Chromium 13 stainless steel has high post-weld hardenability and is easy to crack.

If the same type of chromium stainless steel electrodes (g202 and G207) are used for welding, preheating above 300 ℃ and slow cooling treatment at about 700 ℃ after welding must be carried out.

If the weldment cannot be subject to post-weld heat treatment, chromium nickel stainless steel electrodes (A107, A207) shall be selected.

3. Chrome 17 stainless steel

Chromium 17 stainless steel, in order to improve corrosion resistance and weldability, an appropriate amount of stability elements Ti, Nb, Mo, etc. are added, and the weldability is better than chromium 13 stainless steel.

When the same type of chromium stainless steel electrodes (G302 and G307) are used, preheating above 200 ℃ and tempering at about 800 ℃ after welding shall be carried out.

If the weldment cannot be heat treated, chromium nickel stainless steel electrodes (A107, A207) shall be selected.

4. Chromium nickel stainless steel

When chromium-nickel stainless steel is welded, carbides are precipitated by repeated heating, which reduces the corrosion resistance and mechanical properties.

5. Chromium nickel stainless steel electrode

Chromium nickel stainless steel electrode has good corrosion resistance and oxidation resistance. It is widely used in the chemical industry, chemical fertilizer, petroleum and medical machinery manufacturing.

6. Chrome nickel stainless steel coating

Chromium nickel stainless steel coating has titanium calcium type and low hydrogen type. Titanium calcium type can be used for AC and DC, but AC welding has shallow penetration and is easy to redden, so DC power supply shall be used as far as possible.

Diameter 4.0 and below can be used for all position weldments, and 5.0 and above can be used for flat welding and flat fillet welding.

7. Welding rod

The electrode shall be kept dry during use.

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 oil and other dirt from sticking to the electrode coating, so as not to increase the carbon content of the weld and affect the quality of the weldment.

8. Welding current

In order to prevent eye corrosion due to 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, and the interlayer should be cooled quickly.

A narrow weld bead is preferred.

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