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<...What is the reason for weld depression and the adverse effects on weld quality...>
One of the possibilities is that the individual carrying out the weld was trying to go too fast, and putting down a thinner bead as a result.
<...Grinding on weld is permissible or not...>
CR4 is not a permission-giving entity.
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"Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
"Almost" Good Answers: