Re: [MW:35990] P5A to P8

Qw-423 Allows alternative material for WQT.

You can alter the base material mentioned in the WPS , alternative base material shall be chosen as per the table mentioned in QW-423.

On Tue, 3 Feb 2026, 4:15 pm Aslam Khan, <akchillu@gmail.com> wrote:

What about qw-423, it mention we can use alternative material for wqt,pls clear the doubt

Thanks&regards

Aslam khan
Mob:+965 66744128

On Tue, 3 Feb 2026 at 2:46 PM sridhar cn <sridharcn305@gmail.com> wrote:

As per ASME Section IX, welder qualification for a dissimilar weld (P5A → P8) performed using F-No. 43 filler cannot be done on 

P5A → P5A materials alone. The test coupon must include at least one P8 base metal to represent the metallurgical condition of 

the production weld. Therefore WQT must be performed on a CS + SS test coupon. CS + CS coupon with F43 is not acceptable under

ASME IX.

Sridhar.

On Tue, 3 Feb 2026 at 13:20, Aslam Khan <akchillu@gmail.com> wrote:

I have scenario in site, we have to qualify welders for cs to ss,but we dont have ss material available ,can we do with cs alone using f43 filler wire. wps- p5a to p8- f.no-43

Wqt - p5a to p5a- f.no-43

Thanks&regards

Aslam 

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