Root Pass

The initial weld bead deposited in a multi-pass weld requiring high weld integrity.

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What is the meaning of root pass in SMAW?
Welding Terms
How many welding passes and welding layers at caping are required? If we have a 48′ pipe with 12mm thickness, we are going to use a 4mm rod for the root pass, and 5mm for all other passes.
What is root welding?
Why does 6010 is used as the root welding rod?

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