【Help】How to weld Class B welds
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I need to weld a pressure vessel for 10 cubic meters of liquid hydrogen; its inner wall is made of austenitic stainless steel, with a thickness of 40 mm. Welding can only be carried out on one side at the end portion of the vessel. I plan to use submerged arc welding, but full penetration is required. It seems that backing plates would be necessary, yet it’s not possible to use them. The books suggest that TIG welding could be used for the root pass in order to achieve full penetration. So, what exactly should be used for welding? Could any experts give me some advice? If parameters could be provided, that would be even better. I really appreciate it if you can help
For a 10m3 liquid hydrogen storage tank, why is such a thick wall thickness chosen? The pressure of liquid hydrogen isn’t very high either
Currently, there are two main methods used in the market to ensure full penetration: the first is TIG welding for root pass, with argon gas used for protection; this requires a highly skilled operator. The second method is plasma welding, which allows for both root pass and finishing welds, also requiring argon gas for protection and specialized equipment.