Which pipes in methanol plants require TIG welding for the root pass?
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In methanol plant pipeline welding, which pipelines require TIG welding as a backing process? Is argon arc welding for backing required only for pipes that need flaw detection? Thank you all for your advice! ! !
TIG welding for backing layer 1: is done to ensure that there is no weld slag inside the pipeline, thereby facilitating smooth operation of the automatic control valves. II: It is to enhance the welding strength of the pipeline.