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djhelliweld
Associate

Join Date: Apr 2009
Location: British but live 50/50 Indonesia and Malaysia
Posts: 31

Change to WPS

02/10/2010 11:13 PM

Hi All, I would like to change the gas on our WPS for mild steel grade 50B from 100% CO2 to Argon CO2 mix (Cougar) Do we need to have a new PQR? Sorry to ask I dont have access to standards to check
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Anonymous Poster
#1

Re: Change to WPS

02/11/2010 5:08 AM

The Gas & The composition is treated as Essential Variable (including its flow rate) as per AWS D1.1

And changes in essential variables will call for WPS & PQR change.
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Stewie
Associate

Join Date: Jan 2009
Posts: 42
Good Answers: 3
#2
In reply to #1

Re: Change to WPS

02/11/2010 11:25 PM

Dear Guest,

Please register/sign in. GA for you.

Stewie
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Whitephone
Guru

Join Date: Jan 2010
Location: Mineral wells Tx
Posts: 630
Good Answers: 34
#3

Re: Change to WPS

02/16/2010 5:52 AM

QW-408.2

A separate procedure qualification is

required for each of the following conditions:

(a)

a change from a single shielding gas to any other

single shielding gas

(b)

a change from a single shielding gas to a mixture

of shielding gasses, and vice versa

(c)

a change in the specified percentage composition of

a shielding gas mixture

(d)

the addition or omission of shielding gas

ASME IX (GMAW, GTAW, FCAW) Sure, you need a new WPS/PQR
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