welding procedure test coupon qualified

[stan000]

As per welding procedure , welder is qualified up to 1" in production.
If welder do test coupon 1" by using above procedure then he should qualified up to 2".
Please advice

 

[david339933]

If all you are trying to do is qualify your welder to a greater thickness, test your welder on a 1/2" coupon. This will qualify for unlimited thickness..."Max to be welded".
See Table QW-452.1(b)
As others have stated, 3 layers minimum required.

 

[stan000]

Thanks david.