Hello Syed
You can very well conduct PT after Root pass while welding SS, only ensure that temp. has come below 52 degreeC.
We regularly conduct PT after root pass when welding SS jobs even upto 70mm thick with GTAW.
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.
For thin sections LPT can be done safely after root pass for CS/LAS material.
This is only my experience which i would like to share with you!!
Regards
Prem Nautiyal
Godrej, Mumbai
Cell:9820313278
On Sun, 25 Oct 2009 17:12:07 +0530 wrote
>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.
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.
Based on the above different opinions, kindly suggest me the right one with details.
PREM S NAUTIYAL
CELL : 9820313278
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