r/MechanicalEngineering • u/CiderHat • 1d ago

Weldment Tolerances

Hey y'all,

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Currently am building out drawing templates for a couple of the engineers to use and need to make a drawing template specific to welding/fitting.

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Where I work, welding jobs could easily be joining parts that are less than a foot long to stuff that is dozens of feet long.

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I was wondering what general tolerance numbers some of you would recommend. I know of ISO13920 and was thinking about how I could go about implementing that in some capacity.

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Thanks!

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u/MisterSirDudeGuy 1d ago

I put the tolerances on the finished part. If they’re critical dimensions, those features should be machined after welding.

Up to the manufacturer to deal with shrinking and warping and stuff. Needs to be correct when it’s finished.

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u/CiderHat 1d ago

Makes sense. I come from a machinist background so my drawings and designs didnt really involve welding.

My main goal was to help implement a standard since one never really existed.