preventing pipe bow on fishmouth weld

[995jim]

Are there any proper techniques or tricks to preventing pipe from bowing on a lateral weld? Connecting 16" pipe to 14" branches steel piping. Any help is appreciated. Thanks Jim.

 

[TonyD71502]

Can you provide a sketch of what you are talking about? To prevent or fix bowing, we always either build negative camber into the jig or use a torch to heat certain areas after welding.

 

[weldstan]

Assuming that you may not be able to support the run pipe during welding, weld with the o'let branch in the 3:00 position using small diameter electrodes.

 

[MJCronin]

Jim...

What are the materials being welded and what is the schedule of the stainless piping ?

If the piping is thinner than 10S schedule, it can be a horror show to weld.

How about a sketch ???

MJCronin
Sr. Process Engineer
Venture Engineering & Construction

http://www.VentureEngr.com

 

[Tmoose]

Looks like Jim was here 3 times on Nov 11 and has not been back since.

Not sure if these procedures can be incorporated in your pipe welding WPS or PQR etc.
Item 3 and 6 here -

http://www.lincolnelectric.com/en-us/support/welding-how-to/pages/weld-distortion-detail.aspx