WN Flange weld shrinkage rotates my SS flange

Question

WN Flange weld shrinkage rotates my SS flange

ProjectEng99 (Industrial)

(OP)

17 Feb 05 10:31

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 (Mechanical) · Answer 1 · 2005-02-17 12:56:07

RE: WN Flange weld shrinkage rotates my SS flange

btrueblood (Mechanical) 17 Feb 05 12:56

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

ProjectEng99 (Industrial) · Answer 2 · 2005-02-17 14:31:30

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 (Mechanical) · Answer 3 · 2005-02-18 12:39:03

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

ProjectEng99 (Industrial) · Answer 4 · 2005-02-18 12:49:35

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

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WN Flange weld shrinkage rotates my SS flange