Dear Sir & Expert,
 
For your information, our WPQT test has been discontinued by our client due to non-compliance to  welding consumable specification which required nickel content of at least 9%  

"Consumables shall be chosen to produce welds of compatible chemical composition and
with mechanical properties not less than minimum values specified for the base material.
For duplex stainless steel, consumables shall have nickel content of at least 9% and the
nitrogen content shall be at least 0.14 - 0.2%."

Thus, we seek your advice on this matter whether or not if there is any significant effect  on the weldment quality or mechanical testing such as tensile strength,charpy impact test, bend test, hardness, ferrite count , etc. As we refer to ASME II section C specification, the chemical composition requirements for nickel is between 7.5 – 9.5 which we definitely comply with ASME requirements. During WPQT we using 8.6% nickel content and our result for charpy impact exceed the 40J average value as per client requirement.
Please help me to convinced our client for consider this consumable because these consumable can give same mechanical properties as per 9% nickel content. We also plan to using 9% nickel content during production.  

Thanks.

Aendraa Azhar
Welding Engineer