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[MW:3560] Re: PT after root pass in SS welding

By Materials & Welding
Dear Mr.Devang Naik

What is meant by hot MT ?
Is it possible for Austenitic Stainless Steels ?

Regards

Prem Nautiyal
Godrej,Mumbai
Cell:9820313278

On Tue, 27 Oct 2009 20:49:24 +0530 wrote
>Dear Mr. Syed and Mr. Prem
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You may go for hot MT after root pass.
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Thanks
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Devang Naik
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On Tue, 27 Oct 2009 11:22:17 +0530 wrote
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Hello Syed
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You can very well conduct PT after Root pass while welding SS, only ensure that temp. has come below 52 degreeC.
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We regularly conduct PT after root pass when welding SS jobs even upto 70mm thick with GTAW.
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The chances of cracking after GTAW root pass is seen in thick sections of CS and LAS material i.e above 20/25mm thick OR having high restraints. Hence while welding such materials,we conduct PT after hot pass only.
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For thin sections LPT can be done safely after root pass for CS/LAS material.
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This is only my experience which i would like to share with you!!
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Regards
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Prem Nautiyal
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Godrej, Mumbai
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Cell:9820313278
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On Sun, 25 Oct 2009 17:12:07 +0530 wrote
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>Recently I faced the following issue and kindly clarify my doubt. A qualified WPS for stainless steel (A312-TP304H) requires PT after root pass. After root pass, its not possible to perform PT immediately unless the temperature reduces.
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But, in normal practice,any weld is not to be stopped before completing hot pass or 1/3rd of groove thickness. I got difficulty in following both conditions on single weld joint.
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Based on the above different opinions, kindly suggest me the right one with details.
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PREM S NAUTIYAL
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CELL : 9820313278


PREM S NAUTIYAL
CELL : 9820313278
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