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Welding against concrete

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I have a situation where I need to weld (vertical position) some 1/4" plate
that is set against a concrete wall. The weld would just be a partial-pen
weld, AWS prequalified weld joint designation B-P1c.

My question is: is there anything I must do to protect the concrete directly
behind the weld? Or is this not a problem?

Your comments, please.