Seeking advice! Pipeline welding issues
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I have a question! Does every process pipeline welding require TIG welding as a root pass? What are the quality standards for the appearance of weld beads?
Are there any other standards for this? I don’t think so; it probably depends on what is being welded
Using natural ones is fine, but there is an issue of excess quality.
Not necessarily; it has to be done according to the standards.
For high-risk, high-pressure, and highly toxic media, it is recommended to use TIG welding for the root pass, or dual argon welding； As long as it falls within the scope of inspection, argon arc welding is recommended in order to ensure a high pass rate ； For those pipes that are difficult to clean due to production requirements, TIG welding is also recommended.
Whether to use TIG welding for the root pass is basically determined based on the welding procedure qualification. In general, non-ferritic materials are tack-welded using TIG welding ； In ferritic materials, higher requirements are placed on welds, or preheating of the base material is required, etc.