【转帖】ack weld a nu

yang686526

tack weld a nut
how should you indicate (callout) a tack weld for a nut on a drawing with symbol & verbage? thanks for any help.  
i would not call out a "tack" weld, but would rather specify the proper weld if it is required.  tack welds are usually only temporary work-holding welds, and are usually left up to the welder.  if you need to specify them, then i would call them out like a normal weld process- specify the weld type, length and any other pertinent information.
if you are not familiar with weld documentation, you might want to look at the following:
i agree.
look at your design specs to determine what type of weld is required.
chris
solidworks/pdmworks 08 3.1
autocad 08
is this a language thing, by tack weld do you actually mean stitch weld?
kenat, probably the least qualified checker you'll ever meet...
no, stitch welds are intermittent welds, at fixed spaces and weld length.
as the other guys said, "tack weld " is a shop term for temporary welds to hold pieces together before making the primary weld.
welding nuts over a clearance hole to make cheap tapped holes is good in many applications, but the weld should be defined by type, size, symbol, and whether at 2 points, 3 points or all around.   
in the uk i've heard tack welding used to mean stitch welding, kind of like tacked stitching.  that's why i raised the quesion.
putting a bead along 2 or 3 of the edges may be perceived as being like a stitch weld, rather than all around.
kenat, probably the least qualified checker you'll ever meet...
i'm sure there is a book some where that has a specification and details of this ...probably in some aero-space discipline somewhere. but in my world (oilfields) the contractor are use to the basic term "tack weld" so we just show a fillet weld symbol with the "fish tail" at the end  of the welding symbol and plug in "tack weld" behind it. i've been working in this area 20+ yr.s now and nobody ever came back to me and asked what i meant.
11echo
i too have used it when i designed welded equipment for chemical process industry. but:
1) i didn't use a fillet symbol, just line, arrow, and words tack weld behind the fish tail. (it used to be shown in aws 2.4 that way, but isn't there anymore.)
2) i only used it when i indeed wanted a temporary weld. if it was to be permanent, i wanted more control than that, so i specified a size.
aws 3.0 defines tack weld as "a weld made to hold the parts of a weldment in proper alignment until the final welds are made."
colloquial terms aside, that is it's proper definition.

while i'm sure it's not technically correct, i usually use a fillet weld symbol with "tack" written in the length/spacing location. if it is necessary, i will put a fillet size, but if it is a nut smaller than 1/2" this usually isn't necessary. i may also include "3 places" either under the word "tack" or with a fishtail. again, this probably is ambiguous, but the guys in the shop know what to do.
-- mecheng2005
this reminds me.  just yesterday i heard someone reffering to what is technically stitch welding as tack welding.  he was american too, so it's not just a brit thing.  that said, he was an electrical guy turned manager so...
kenat, probably the least qualified checker you'll ever meet...