what if you WANT the weld to shrink around the article being welded into something? IE: a press fit housing for something, that has broken and you want a tight fit after weld clean-up? Something where a little "draw" is o.k. and in some cases beneficial:ie tacking the pinch holder of a round-stock "feeler" or lever arm?
Too much, if any, undercut would cause a stress-riser, where the concave weld, if a ductile filler is used, and undercut minimized, on the ID of the "clamp"; and post weld cleanup, will get a better fit/grip on the lever; Proper exterior/OD weld and clean-up to boot, that doesn't dig but just barely penetrates, or contacts this ID with out affecting it
what's to stop it from clamping a ring or tie-on,ect,if the weld is pinching it into place?
Just trying trying to learn more stuff.