On the requirements of welding skills for stainless steel pressure vessels

The importance of welding work
Pressure vessels are explosive hazards and when an explosion occurs it can be catastrophic. It has been proven that most of the pressure vessel leaks and explosions originate from the fracture of the welded joints. Therefore, welding quality is the key to ensure the safety and reliability of pressure vessels.
Welding requirements
The welding requirements for stainless steel pressure vessels are as follows.

1. The beveled surface of the welded joint must be constructed by mechanical means.

2. Welding materials must be de-hydrogenated and strictly cleaned.

3. The operator who undertakes the assembly of the welded joint must wear clean gloves and must not touch the bevel and the area near its sides.

4. Welding should be carried out immediately after the cleaning of the welded joint is completed.

5. The purity of argon and helium for welding should not be less than 99.99% and the dew point should not be higher than minus 50°C.

6. Before welding titanium, the bevel and the 25mm range on both sides should be subjected to strict mechanical cleaning and degreasing treatment. Measures should be taken to prevent bevel contamination during the welding process.

7. Effective measures should be taken to avoid the mutual dissolution of steel and titanium during welding. When required by the drawing, iron contamination tests should be done.

8. In the welding process, after each weld, the surface colour of the weld layer must be checked, the surface colour of the weld and heat affected zone is silvery white or golden yellow. The surface colour is not qualified, all should be removed, and then re-welded. Surface colour inspection should refer to the provisions of the relevant standards.

9. Inert gas double-sided protection arc welding or plasma welding must be used. The connection between the titanium tube and the tube plate is suitable for strength welding or post-expansion welding.

10. The surface of the weld after welding is not allowed to have defects such as biting, porosity, arc pits and cracks.
Conclusion

Although it is impossible to determine a welding channel or a vessel on the welders "drip" how many times, but it can be determined that the quality of welding and welders "drip" is inseparable. Welding quality is more important than a mountain, this is not an alarmist statement, even a good enterprise will be a crisis bomb down. Therefore, to be a tungsten arc welder should not only have operational skills, but also quality awareness and responsibility, to ensure the quality of welding, to ensure the safety of the pressure vessel, to be responsible for themselves, to be responsible for the enterprise, to be responsible for society.
Source: Reprint
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