Weld repair to bevel angle

Date 03-10-2015 15:46

If the bevel angle (require 37 degrees) on a dia. 600mm SS316 rolled pipe with 12 mm thickness is wrongly machined oversize to 60 degrees, can it be build up with welding and re-machine again? The length cannot be shorten for new bevel.

If possible, anyone has experience with distortion on the roundness/diameter after weld build up?

Regards
Boon

By Superflux (****)

Date 03-10-2015 17:29

It might retard warp if you were to weld a piece of "scrap" 600mm X 12mm of sufficient length to the end. With a 60° existing bevel, it could possibly be a single bevel with backing or back welded/gouged and then remachined to proper length and bevel.
The other option would be to weld a 600mm dia. plate (or larger) to the end. If a 570mm hole were cut in the end, then a back weld (if needed) could be made.

By WeldinFool (**)

Date 03-10-2015 18:23

I can tell you a couple of things:
--You will definitely see some shrinkage of the pipe if you weld on it, nothing you can do about that (stainless sucks that way). If the ID and OD dimensions are critical, this may give you problems.
--If the pipe has been beveled down to a sharp edge (no land), this will burn away when you try to build it up with weld, causing a loss of length. This then requires additional welding to restore the original length, which causes more distortion and shrinkage...
Your best bet would be to fit up the pipe to whatever it gets welded to, leaving the 60 degree bevel, and make the weld extra wide to cover the whole mess up (with an Engineer's approval, of course!)

By Boon

Date 03-10-2015 23:37

I think the better choice would be to leave the over angled bevel alone for fitting to pipe on site.
Problem is whether client would accept.

BR
Boon