A333 Gr 6 WPS/PQR impact testing requirements 1

[Ray2020]

Dear Experts,

We have developed a new welding procedure for our client however, they are not happy with the impact test temperature.
The minimum design requirement for the vessel is -29 degrees C therefore we impact tested the test pieces at -30 degrees C.
The client is saying that the impact should be done at the rated temperature of the material A333 Gr 6 which is approx. -45 degrees C.

Their specification doesn't mention anything about impact testing should be done at -45 degrees C. He is using the ASTM Specification A333 as his reference.

He wants a reference from ASME mentioning that impact testing in a welding procedure is not required to be at the rated temperature of the material, then he'd allow it.

Can someone please help me with this.

Regards,
Ray

 

[XL83NL]

Sure we can. Take the applicable code of construction (which you haven’t mentioned) and look up the requirements which that code, for your specific application, will put on the PQR.
/edt: take ASME IX along with it to determine the overall requirements.
Huub

 

[gtaw]

So, I take it the "client" is the Owner and your employer it providing a service, i.e. installing or fabricating piping.Is your employer also the designer? It would be nice to know just who is who. As noted, you don't mention the applicable construction code nor did you include any additional requirements included in the contract documents. There's just so many loose ends to your inquiry.

Fortunately, if you are constructing in accordance with ASME, Section IX allows one to perform the CVN on any pieces left over from the original PQR test piece. What, you didn't save the "drops". For shame. Now you'll have to weld up an additional sample using the same parameters, i.e., voltage, amperage, travel speed, etc. as the original test and perform the CVN on the new test assembly. What? No one recorded that information! They are supplementary essential variable if CVN testing is required.

He who holds the gold makes the rules my friend. There's usually more to the story, as Paul Harvey used to say, "And now, for the rest of the story."

Best regards - Al

 

[weldstan]

one wonders why you would not qualify the impact tests at -45 C, when the PQR could have such greater use for you in the future. I know, I always did.

 

[david339933]

UCS - 67: The welding procedure qualification shall include impact test of the weld metal and HAZ in accordance with UG-84 when required.

UG-84(b)(2): impact test temperature shall not be warmer than the minimum design temperature.

Where did -29C come from?...strange it is the exemption temperature of UG-20(f). You could also use impact tested filler metals and be exempt for SA-333 Gr. 6.

 

[Dhurjati Sen]

I fully agree with weldstan. People are so fond of code jugglery that they simply miss the greater utility (of following the codes).

DHURJATI SEN
Kolkata, India