Question: what is the difference between root pass filling and capping?
Answer: Root Pass – The first weld bead placed in the weld joint in a multi-pass weld. Fill – Also referred to as a fill pass, it is the amount of weld bead necessary to fill the weld joint. ... Cap – The final weld bead in a weld joint. It may be completed in the form of a stringer bead or by a weaving motion back and forth.