Re: [MW:17558] Combined welding process qualification

Hi, Han

Pls note the followings:

1) If you have done back chippind then possibly you have removed all the weld metal deposited by GTAW.

In this case your procedure is qualified only with SAW with backing. Welder is also qualified only for SAW.

2) In this case you should use GTAW process after back chipping so that you will have complete 5 deposition

with GTAW & 16MM with SAW.

With this your procedure & welders will be qualified with GTAW+SAW OR GTAW & SAW separately.

Regards,

Zakir Ali.

INDIA


From: Rudolf <rudolf_jude@yahoo.com>
Sent: Tue, 23 Apr 2013 16:53:19
To: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>
Cc: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>
Subject: Re: [MW:17528] Combined welding process qualification

Hi may I know why do you want I back gouge after you have welded with GTAW. 

Sent from my iPhone

On 23 Apr, 2013, at 3:57 PM, james gerald <gerry_tup@yahoo.com> wrote:

If the GTAW weld is not part of Bend Test / Radiography, then GTAW welder has to be qualified separately.

 

SAW welding operator do not require separate qualification.

Thanks & Regards

J.Gerald Jayakumar
00968-99438165

From: Han Kuen Chow <chowhk2013@gmail.com>
To: materials-welding@googlegroups.com 
Sent: Tuesday, April 23, 2013 11:27 AM
Subject: [MW:17520] Combined welding process qualification

Dear Expert,

Could you please give your opinion for following matter?

Combined welding process: GTAW + SAW
Test coupon: Single U
Plate thickness: 20 mm
GTAW - root pass and hot pass (approx. 4 or 5 mm)
SAW - filler pass and capping (approx. 16 mm)
Root to be back gouging and filled with SAW.

Question:
1. Does this welder / welding operator qualify to weld with GTAW and SAW? Root to be back gouging and filled with SAW.


2. Is separate qualification required to qualified this welder / welding operator for GTAW + SAW?




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