P5A to P8

[Aslam Khan]

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 

[venkateswara reddy Desireddy]

We can use P5a. 

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Sent: Tuesday, February 3, 2026 10:50:27 am
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Subject: [MW:35983] P5A to P8

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[Manoj Mumbai]

As per code you can use. 

Convince your customer also before starting WQT.

Thanks & Regards

Manoj

[sridhar cn]

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.

[Anandhapadmanabha pillaim]

As per ASME SEC IX QW-423 Which allows alternative materials for welder qualification and the welder will be qualified within the ranges of the essential variable, you can proceed with WQT on a P1 to P1 material with F43.

[Aslam Khan]

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

Thanks&regards

Aslam khan
Mob:+965 66744128

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[Anandhapadmanabha pillaim]

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.

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