Used shielding gas PQR
Used shielding gas PQR
(OP)
Hello,
I have a PQR:
Code AWS D1.1
Process: GMAW
Material: S235JR
Filler: Lincoln LNM 26 ER70S-6. AWS A5.18
Prescribed shielding gas: Ar or Ar-CO2
Gas used for PQR:
Shielding gas: (M24 - Ar-CO2-O2)
I think this is not allowed because:
Applied shielding is not in accordance with supplier data sheet
Applied gas is not in accordance with AWS A5.18
Is my opinion correct or is this allowed in accordance with AWS D1.1?
Rg Patrick
I have a PQR:
Code AWS D1.1
Process: GMAW
Material: S235JR
Filler: Lincoln LNM 26 ER70S-6. AWS A5.18
Prescribed shielding gas: Ar or Ar-CO2
Gas used for PQR:
Shielding gas: (M24 - Ar-CO2-O2)
I think this is not allowed because:
Applied shielding is not in accordance with supplier data sheet
Applied gas is not in accordance with AWS A5.18
Is my opinion correct or is this allowed in accordance with AWS D1.1?
Rg Patrick





RE: Used shielding gas PQR
Did you mean "I have a WPS" ?
Have a look at Table 4.5 (19)
Cheers,
DD
RE: Used shielding gas PQR
yes I have, butt the used gas inthe PQR was Ar-C02-O2)
I think oxygen is not allowed (O2 not approved). See attachement filler matwerial from supplier.
Patrick
RE: Used shielding gas PQR
Don't try working to EN standards when using American standards.
RE: Used shielding gas PQR
the supplier has determined the mechanical properties as welded with C02-Ar and not with O2.
I think this is not correct.
RE: Used shielding gas PQR
If one wants to store the welding electrode under water before using them (no, I am not saying that it is a good idea), one must demonstrate that doing so will not be detrimental to the outcome. Welding a test assembly using the electrodes stored under water is allowed if it can be demonstrated the electrodes are still capable of producing a weld that has the required tensile strength, soundness, and any additional properties dictated by the applicable welding standard. The other/additional properties may include the ability to meet visual acceptance criteria, radiographic acceptance criteria, hardness requirements, notch toughness, and chemistry. That said, providing all the test results are acceptable, the electrodes stored under water would be permitted for production welding.
In your case, any shielding gas or mixtures of gases that was used to weld a test assembly that produces acceptable results can be used for production.
Best regards - Al
RE: Used shielding gas PQR
RE: Used shielding gas PQR
Is the deletion of the O2 not an essential variable ?
19) A change in shielding gas from a single gas to
any other single gas or mixture of gas, or in
the specified nominal percentage composition
of a gas mixture, or to no gas
Cheers,
DD
RE: Used shielding gas PQR
RE: Used shielding gas PQR
RE: Used shielding gas PQR
Was the gas used for production the same as the gas used to qualify the WPS?
As long as the nominal percentages of the various components of the gas mix recorded by the original PQR are the same as that used for production, all is good. If the composition of the gas is subsequently changed, then a revised WPS is required and it must be qualified by testing with the parameters used recorded (while welding the test assembly) with the test results on a new PQR.
By the way, "Hello DekDee" aka Shane. How's life treating you?
Best regards - Al
RE: Used shielding gas PQR
Hello,
I have a PQR:
Code AWS D1.1
Process: GMAW
Material: S235JR
Filler: Lincoln LNM 26 ER70S-6. AWS A5.18
Prescribed shielding gas: Ar or Ar-CO2
Gas used for PQR:
Shielding gas: (M24 - Ar-CO2-O2)
When I saw "Prescribed Shielding Gas: Ar or Ar-CO2" I presumed he actually meant to say "I have a WPS" and not PQR as stated.
Then it states the gas used for the PQR was Ar-CO2-O2 - hence the reference to the deletion of the O2 from PQR to WPS.
Hi Al,
Just got back to Malaysia this morning from a great week of R&R home in Thailand.
Flew back on Malaysia airlines - quite happy to get feet on the ground after what has happened.
How is life treating you - all good ?
RE: Used shielding gas PQR
I just finished a three week road trip for AWS and ASME, so it nice to be home for a bit. I should be in New Jersey for a small job this week. Day trips are a nice change.
The grandsons are wrapping up their hockey season and are going into spring training to prepare for next season.
All is good.
Do you have my E-mail. If not, check the other site so we can keep in touch.
Best regards - Al