yang686526

welding components flush
i have a welded assy where two components are line-on-line. is the fact that they are line-on in the dwg descriptive enough or would some gd&t be needed? i had thought of a profile tolerance of the entire surface. would a note, such as, "surfaces flush" be adequate?
thank you,
matthew
assuming you're in the us drawing to asme/ansi stds.
showing items in line may not be adequate as it doesn't assign a tolerance of how much out of line they can be. it's sort of covered by asme y14.5m-1994 2.7.3 although it's not one of the cases explicitly detailed so some may argue the opposite.
when you effectively want flatness of multiple surfaces then you are correct that profile of a surface is the correct control, at least to asme y14.5m-1994 6.5.6.
not sure about your note, if nothing else you'd probably want to define how flush, e.g. +-.005. however this may be ambiguous and there may be an argument that gd&t is more explicit.
a lot may depend on how 'flush' they need to be and the specific situation. afraid i haven't done that much work on welded assemblies.
kenat, probably the least qualified checker you'll ever meet...