Re: [MW:32297] Re: Back Weld at Pressure vessel - U stamp

Please understand whether this problem in Production Joint or during PQR Qualification. When you take it with your Client, list all the possible Code clauses and convince the Client that none of the Code clauses are violated.

1. First the WPS is suitable for welding single sided or double sided and with Backing or without Backing since all these variables are non-essential variables as below ASME Sec.IX snap shot.

2, Secondly consider all other code clauses and convince your Client that weld is within code limits/

Thanks & Regards

J.Gerald Jayakumar

On Monday, 19 April, 2021, 06:06:35 pm IST, Ramesh <rameshkannandevaraj@gmail.com> wrote:

Don't not confuse with production weld and repair welds

 

Though its single sided weld as per WPS for your production ,  when repair comes at root what you do ? ( presuming accessible at root side )

 

For repair, your weld metal is backing material, so any welder qualified with backing or without backing can repair in your case. 

Thanks and Regards

Rameshkannan D

"What you have learned is a mere handful; What you haven't learned is the size of the world – Avvaiyar"

On Mon, Apr 19, 2021 at 5:31 PM Vishwas Keskar <vvkeskar123@gmail.com> wrote:

Dear Samkar

May I know what is your concern now ?

On Mon, Apr 19, 2021 at 3:51 PM sankar bombay <sankar.bombay@gmail.com> wrote:

For GTAW Welder QW-402.4 Deleting of backing is essential Variable 

Addition of backing they have not mention 

On Mon, Apr 19, 2021 at 2:19 PM Ramesh <rameshkannandevaraj@gmail.com> wrote:

Seems weld repair carried out at the root side. Whether your repair carried out as per approved repair procedure ? 

 

With Backing or without backing is essential for welders, not for procedures !

unless there are any specific requirements from the client / inaccessible area for root welding.

Thanks and Regards

Rameshkannan D

"What you have learned is a mere handful; What you haven't learned is the size of the world – Avvaiyar"

On Mon, Apr 19, 2021 at 1:09 PM Vishwas Keskar Welding Manager WELDING <vvkeskar123@gmail.com> wrote:

Is  that WPS  addressing - 

 QW 402  - Joint design - GTAW - Backing - With/Without 

(Ref - QW256- GTAW - QW 402.5- Addition of  backing is Non essential variable.)

if Both (Backing - With/Without  )  is addressed( which  like  normally is  addressed), then there is no issue at  all .

Eg-

QW 402-

Backing: With/Without                                                                         

Root spacing: As per piping fabrication drawing                                                                                                          

Backing Material (Type): Yes (Metal)

1. Metal -        2. Non-fusing Metal      

3.   Nonmetallic NA   4. Others 

The matter is to  be resolved  amicably . Meet QAC  In charge along with Welding Engineer, Manufacturing Responsible. Explain him the details . 

It shall be acceptable.

Regards

On Monday, April 19, 2021 at 7:20:46 AM UTC+4 sankar krishnan wrote:

Dear Gentlemen,

   Good Evening, In our project Vessel joint thickness 10mm ,Process(GTAW+SAW),Single V joint 

They completed Welding ,Few days later during Inspection we observed , They have done Internal Welding of the shell, As per WPS its not shown 

Guys let me Know  its can Accepted or Rejected 

If Rejected , Please send Reference code standards

As per QW 402.5 Joints (Backing its non Essential ),Its mention Backing strip or also back welding 

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