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Re: Stitch Welding - Staggered vs. Directly Opposite

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On Mar 3, 2010, at 1:22 PM, Daryl Richardson wrote:

I have a W18x45 runway beam with a C12x20.7 cap channel topped by a 1.5x1.5 square bar for the crane rail. The specified welding is 0.25"; 3"welds @ 12" spacing. The question is "Should the opposite side welds be staggered or directly opposite one another?"

I don't think it matters much, except that stitch welding like that is a fatigue failure magnet. Every time you start and stop a weld bead the weld tends cool quickly and harden and there's more of a chance of arc strikes and other defects. You should inspect (either PT or MT) those welds carefully for small cracks.

Christopher Wright P.E. |"They couldn't hit an elephant at
chrisw(--nospam--at)   | this distance" (last words of Gen.
.......................................| John Sedgwick, Spotsylvania 1864)

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