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impact results - UHT material´s welding

impact results - UHT material´s welding

impact results - UHT material´s welding

(OP)
Dear colleagues,

I hope this message finds all you well

Project: ASME VIII- Pressure vessel - material ASME SA517 Gr B. Thickness 9,5 mm.

I have to qualify a WPS for welding ASME SA517 - B with impact requirements at -40 C,

Also is required PWHT, and my first results of impact test @-40C of test plate were very low. (lateral expansion less than 0,2mm and energy less than 20J)

The declared Values of certificate of consumable is 75J @ -73C !!!

Can the presence of PWHT changes so much the values of impact? (certificate´s value is "as welded" and my results is "after PWHT".

Any help will be very useful.

Thanks a lot,

Fernando Lescovar Neto

RE: impact results - UHT material´s welding

Most certainly PWHT can effect impact behavior of weldments. Exposure to elevated temperature from PWHT can result in secondary hardening for some alloys, thus lowering the impact values from as-welded values.

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