Hi,
whenever welding plate flange with pipe you have to give clearance of
1.5 mm on flange . same OD same ID how it will go? even drive fit it
require some clearance . this is the reason the job spoiled. while
welding steel will expand u have to consider coefficient of expansion
steel too.
for good sound welding insert the pipe smoothly inside the flange and
keep 6 mm below the face of flange face and weld fillet welding and
pipe OD to Flange ID weld fillet of 8 mm. .
Muthu Barathi P
Sr Manager QA/QC
AFCONS
On Mon, 27 Sep 2010 11:17:41 +0530 wrote
>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
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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>
Dear Sir,
Thanking You,
Honesty is the best Policy
With Warm Regards,
P Muthu Barathi
Mobile No:09967300544
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