Recent content by r6155

I insist: "More info: design pressure and temperature?" And now: The diameter of the bolt you are considering is? Something is strange here

More info: design pressure and temperature?

During design, everything matters. PWHT is key in this case. At first glance I don't like your design.

PWHT is not mentioned, why?

How do you plan to weld the flange to the cylindrical shell? Shell thickness and material?

It is impossible to draw a conclusion.

@ DekDee Once the manufacturer/ inspector has specific reason to doubt the ability of a welder, the validity of that welder gets terminated. As clearly stated in QW-322, the welders whose validity has been revoked shall requalify. That is, the ordinary renewal coupon is not enough...

P91 welding requires great care. Lack of penetration is a serious problem. No inspection was performed during the root pass of the weld, and I assume the preheating and argon purging weren't inspected either. What else happened that you don't know about?

@ DekDee ????????????? The welder has failed and a retest is required. ??????? ????????????? What does ?????. Could you explain it? Do you understand that the welder is a candidate for an award?

This is due to a lack of inspection at the root of the weld. The welder has failed and a retest is required. The defective weld is not approved.

@Karik87 You said: "It is very difficult for me to explain the test results to Client." Well, you need to read more and take a welding and NDT training course Impact test requires a step-by-step inspection by qualified personnel.

Which test coupon did you select? You need to read more.

And the impact test at the HAZ? Was another test performed?

There are many errors during specimen extraction, machining, and testing. Did you witness all the steps?.

quenched and tempered.