API 16A

[nadfourchon]

In API 16A Sec. 7.3.6.2 "Deposited weld metal properties" it states: The deposited weld metal mechanical properties shall meet or exceed the min specified mechanical properties of the base material. Verification of properties shall be established through the implementation of the manufacturer's WPS and supporting PQR. When materials of differing strength are joined, the weld metal shall meet the minimum requirements of the lesser material.

What does this mean? Does this say that when I develop a new WPS and PQR that I must do mechanical testing with specimens made from strictly weld metal along with the specimens of base and weld metal? Or is the required mechanical testing of the welded specimens enough?

 

[Bonswa]

Simply put, that section is just saying that the weld metal being used must be as strong if not stronger than the weaker of the two materials being welded together.

If you're welding material "A" to material "B", and material "A" is a stronger than material "B", then the weld metal being used must be AT LEAST as strong as material "B".

The part about WPS and PQR just states that the strength of the weld metal being used can be found in the manufacturer's WPS and PQR. That information is to be used to verify that the weld metal IS at least as strong as the weaker of the two base metals.

 

[nadfourchon]

Thanks