Detailing of Weld Prep
Detailing of Weld Prep
(OP)
Hello,
I am working on a weldment of a square tube, where the 4 walls are welded together at the corners. I am calling out a Single V groove with a backing plate. I have modeled the tube in its finished condition with the 4 walls touching each other. I have also detailed the pieces out on separate pages. My question is... do I show the details of the pieces with the weld prep on them, or the full width? the specific weld callout and pre-qualified weld shows the corners with a 1/4 in gap when welding. I do not want the fabricator cutting the individual piece incorrectly to start based on the detail, but I also do not want a model with 1/4 in gaps showing in upper assemblies. What is the proper way of relaying the weld prep information on a drawing?
Thank you in advance.
Marshall
I am working on a weldment of a square tube, where the 4 walls are welded together at the corners. I am calling out a Single V groove with a backing plate. I have modeled the tube in its finished condition with the 4 walls touching each other. I have also detailed the pieces out on separate pages. My question is... do I show the details of the pieces with the weld prep on them, or the full width? the specific weld callout and pre-qualified weld shows the corners with a 1/4 in gap when welding. I do not want the fabricator cutting the individual piece incorrectly to start based on the detail, but I also do not want a model with 1/4 in gaps showing in upper assemblies. What is the proper way of relaying the weld prep information on a drawing?
Thank you in advance.
Marshall





RE: Detailing of Weld Prep
If you're detailing the weldment, you'll likely be referencing a welding standard (AWS D1.1/D1.1M maybe?) that fully details the weld-prep. So, doing so on the face of the print would be double-dimensioning.
RE: Detailing of Weld Prep
If the models of those components doesn't work in the next higher assembly then you can't use them directly, so you'll need surrogate component models. Interesting drawing configuration challenge.
Alternately, you might consider a "weld bead" component within the assembly to make everything whole. That may work fine if all you need is a pretty picture. Probably not so well if you are also using the model for FEA and expect accurate results in the weld area.
RE: Detailing of Weld Prep
Normally on drawings we only need show the weld symbol you require
see this link:-
http:
However there no harm in detailing the preps for the welded joints particularly if one part is being machined prior to welding, its easier to have the prep machined on than the fabricator do it with a hand grinder.
Another link:-
http://www.twi.co.uk/content/jk65.html
desertfox