The thickness and the P-no of the base material determines the need for a PWHT.
UCL-34 requires to perform the PWHT after the application of the corrosion resistant weld metal overlay etc.
The fact is that your deposit is not a corrosion resistant one since it is a carbon steel and the scope of UCL is related to corrosion resistant cladding etc.
What is the purpose of your cladding? Are you sure that if falls under UCL? Are you sure that UW-42 is not applicable to your case?
Dr. G. Dilintas - Authorized Inspector Supervisor
I&F Regional Technical Manager
Bureau Veritas Piraeus - Greece
Tel: +30 210 40 63 113/4
Fax: +30 210 40 63 118
Cell: +30 69 44 64 62 04
JASPAL SINGH <jaspaldhesi@gmail.com>
Sent by: materials-welding@googlegroups.com 01/11/2010 06:16
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Dear All,
As per Client Requirement, we need to do the 10mm Carbon Steel Deposit
on 250mm Thick Alloy Steel Tube Sheet( 1.25Cr, 0.5Mo).
What will be the PWHT requirement for deposit.
If we consider the exemption in UCL-34 (Soaking Time as per deposit
thickness), that is applicable for Corrosion Resistance Weld Overlay.
Carbon Steel over Alloy Steel is not Corrosion Resistance Overlay.
How to Qualify Procedure for the same or we can use butt welded
qualified PQR.
The main issue is PWHT time?
Regards
Jaspal Singh, CWI-AWS, CSWIP-3.1
Quality Assurance
Process Equipment Division
ISGEC, Yamuna Nagar, Haryana -135001
Phone: 911732307251
Ext: 251 Mb: +91 9996624244
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