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Re: [MW:7212] problem SS 316 flange to pipe welding

By Materials & Welding
please provide the sketch showing arrangement during welding. Also indicate the area where the dimensions are going out. So that people from the group can understand your problem and answer

On 24 September 2010 19:45, rmsengineering <rmsengineering@gmail.com> wrote:
We are fabricating flanged connections for one of our customers
 flange dia 350  id220 and thickness is28 mm  is   joined to 220od
8thk pipe     After welding it is observed that out of 6 jobs in 4
jobs the flange has warped in two jobs it is beyond repairs to such a
extent that the face & od to be machined is beyond tolerances (od run
out is 10 mm face is out by 7 mm )
Anticipating this problem we have press  fit the components and made
the arrangements for rapid cooling but still this has happened
Now we need to manufacture 10 more flanged connection of the same
type
what precautions should be taken
The welding is done by GTAW 5mm thk fillet all over 5%thoriated 3mm
rod with filler ss 316L 2,5thk current 180Amps inside welding was
fused where as for out side welding filler was given

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C. K. Purohit
Eng-Tech Weld1
Sr Welding Inspector

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