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Re: [MW:35961] WPS requalification for repair weld ASME B31.3

By Materials & Welding
The qualification range would be 16 to 36mm if you qualify a PQR On 18mm plate thickness, PWHT soaking on pqr is 1hr 30mins so maximum soaking with impact will be 1hr 52.5hrs, if you are doing the resoaking and if the total soaking time ( Actual PWHT & Repair PWHT soaking time) is within this range you can use this, if it exceeded need to requalify.

The above explanation is based on With impact testing below the Lower transformation temperature (AC3)

On Wed, 28 Jan 2026, 6:19 am Babur Khan, <mbabur.bwp@gmail.com> wrote:
Greetings,
Need expert opinion for the following query:
Construction Code ASME B31.3, Qualification ASME BPV Sec. IX.
One of the WPS is qualified for Low temperature Carbon steel with impact testing and PWHT. The qualification range is 20mm to 36mm. 
PWHT is applicable (Project specification). Soaking time was 1 hr 30 minutes.
Question: Is this WPS qualified for a repair weld with this soaking time? 
Is a new PQR to qualify the repair joint?

Best Regards,

Muhammad Babur Khan Lashari
Project Quality Supervisor.
API 570, API 510, CSWIP 3.2.2. ISO 9001:2015

Mob: +966 58 2774568 / +966 51 0559680

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