Dear Meera,
For point no. 2: In my experience, If root pass having more concave in shape (in STT root this may happen), there might be a chance of getting cold lap in between root and hot passes. Please ensure that the shape of root pass should be flat/ little concave shape, so that proper fusion will take place during hot pass welding. Also instruct the FCAW welder to reduce the welding speed or wire feed speed in order to have proper fusion in all other passes also.
Regards,
L. Prabhu kumar,
From:
Sent: Sunday, April 04, 2010 3:37 AM
To:
Subject: [MW:4680] Difference between pipes and tubes
Hai all,
1.Please somebody can explain difference between pipes and tubes with some references.
2. In our project continuously getting repair ( Cold lap) in hot and fill pass. can u suggest some good way to avoid or rectify this.
material Used - CS dia 68,64 and 60"
Process : Root - STT, Other - FCAW shielding by gas ( Ar80%, CO2 20%- 48 CFH)
Filler metal for FCAW : A5.20 E71T-9M
Expecting reply as soon as possible.
Regards,
Meera
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