Re: [MW:4806] Buttering procedure for P4 to Inconel

According to ASME IX

 

QW-283 Welds With Buttering

QW-283.1 Scope. This paragraph only applies when the essential variables for the buttering process are different

than the essential variables for the process used for subsequent completion of the joint. Common examples are

(a)

the buttered member is heat treated and the completed weld is not heat treated after welding

(b) the filler metal used for buttering has a different F-Number from that used for the subsequent completion of the weld

QW-283.2 Tests Required. The procedure shall be qualified by buttering the test coupon (including heat treating

of the buttered member when this will be done in production welding) and then making the subsequent weld

joining the members.

 

 

2010/4/13 Muhammed Ibrahim <ibratech@gmail.com>

Hi Members,

 

Kindly request your suggestion on the following matter.

 

We have to weld one 2" Nozzle (PNo.4) to Tube sheet with (PNo.4). Due to some practical dificulties we have to avoid PWHT of this joint. So we are planning to buttering both nozzle and tube sheet nozzle opening with Inconel. Then Butt weld the joint with Inconel.

 

We have one overlay procedure (SMAW) with Inconel on P4 material with PWHT and another butt welding procedure for Inconel to Inconel (GTW+SMAW) without PWHT.

 

Can I use these PQR together for this butt weld?.

 

Or I have to qualify a new buttering+buttwelding PQR with same condition?.

Thanks & Regards
Muhammed Ibrahim PK

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