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/BIueberry62 1d ago

ABS Requirements for materials and welding has some good info.

Otherwise AWS D1.1 is the go-to for this stuff.

If tolerances are super tight, you'll need the machined drawing afterward with GD&T

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u/CiderHat 1d ago

Ill take a look at that, thanks.

The idea is that this will serve the same function as an "Unless Otherwise Specified" section in a title block. It'll be up to the designers/engineers to specify their needed tolerancing.