WN Flange weld shrinkage rotates my SS flange

[ProjectEng99]

What is BEST PRACTICE for welding a 60" Dia SS WN flange to keep the weld from shrinking & rotating the flange face 1/8" at OD. The flange lays back at OD when weld shrinks.
Thank you
Dee Anderson

 

[btrueblood]

Add a weld pass on the i.d. of the flange?

 

[ProjectEng99]

Welding to 3/8" wall ss pipe.
ID bevels on Flange & Pipe with 1/6" lands.
1. Tig root ID
2. Flux core ID 1 pass
3. Sub Arc ID
4. BAck gouge OD & Sub ARc 1 pass

The flange face was flat until step 4 where it pulled 1/8" towards the weld the flange OD.
We had 1/8" lands at first and it pulled worse.
We tried 200F preheat but it was no help.
Thank you,
Dee Anderson

 

[arto]

Bolt it to a mating flange [pre-rotate a bit the other way] as a strongback?

 

[ProjectEng99]

The shop says they did that years ago and it warped the mating flange too!!! But we may make a blank up anyway just for this purpose, or maybe some other type of fixturing.
Thanks
Dee