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What aspects should be paid attention to when welding stainless steel socket welded pipe fittings?

Published on:

2022-02-24 10:50

There are many kinds of stainless steel socket welded pipe fittings, which have been widely used in these fields due to their superiority in the field of health, especially for flammable and explosive pipes. So do you know what to pay attention to when welding socket welded pipe fittings?

The following points should be paid attention to when welding socket welded pipe fittings:

1. In order to prevent hot corrosion, the welding current should not be too large, 20% smaller than that of carbon steel, the electrode and arc should not be too long, and the interlayer cooling is fast.

2. The hardenability of socket welded pipe fittings after welding is relatively large, and it is easy to crack. After welding, it needs to be preheated above 300 °C and cooled slowly at 700 °C.

3. For socket welded pipe fittings, in order to improve corrosion resistance and weldability, an appropriate amount of titanium, niobium, molybdenum and other invariant elements are added, and the weldability is better than stainless steel pipe fittings.

4. Socket welded pipe electrodes have excellent corrosion resistance and performance, and are widely used in chemical, fertilizer, petroleum and machinery manufacturing.

5. The coating of the socket welded pipe is titanium calcium type and low hydrogen type. The calcium type can be used for AC and DC, but the penetration depth of AC welding is shallow and it is easy to turn red. Generally, DC power supply is used.

6. Socket welded pipe fittings have corrosion resistance and heat resistance.

The uneven wall thickness of the socket welded pipe mainly occurs in the deformed parts of the stainless steel pipe fittings, such as the wall thickness of the back of the elbow is thinner than other parts; the wall thickness of the nozzle is different from the wall thickness of the stainless steel pipe fittings.

When welding our pipe fittings, you need to pay more attention to the above precautions.

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