We are essentially doing GMAw welding on thick plates with single grrove with 2 m root face. . One way of checking penetration is to see whether an uniform weld metal deposit has appeared on the bootom side. If it has then it is grinded and removed other wise gougins is done and welded again. I therefore agree that it is not backing. Backing is done generally where appraoch from the other side is not available and whre full penetration is the requirement. Arijoy Roy R&D Telcon Jamshedpur
--- On Wed, 23/3/11, Karthik <karthik6684@yahoo.com> wrote:
From: Karthik <karthik6684@yahoo.com>
Subject: Re: [MW:10480] RE: 10463] Backing
To: materials-welding@googlegroups.com
Date: Wednesday, 23 March, 2011, 9:32 PM
| I think,this is not a backing,because this is to make sure for the welder confirmation. it is happen in normal practice that after welding of single v groove of plate and to be confirmed by visual to confirm the full penetration..and if the penetration is good...many(All) times the welder need to confirm by themself by grind to some depth after confirm by visual (1 or 2mm max..) to make it look good appearnce as well as to avoid any discrepancies in RT.(even it can accept in Rt without grinding) As far as my experience and Customer,AI witness.. it was accepted as without backing...
Thanks & Regards,
(Karthik)
Karthikeyan.S QA/QC Manager Getabec Energy Co.,Ltd. 379,Moo6,Soi8,Nikhomphatana, Rayong-21180, Thailand. Phone: 0066 38 897035-8 (Off) Fax: 0066 38 897034 Hand Phone: 0066 892512282
--- On Wed, 3/23/11, John Henning <jhenning@deltak.com> wrote:
From: John Henning <jhenning@deltak.com>
Subject: [MW:10464] RE: 10463] Backing
To: materials-welding@googlegroups.com
Date: Wednesday, March 23, 2011, 9:41 PM
YES – it is welding with backing. See QW-402.4, non-essential variable for both SMAW and GMAW and an essential variable for welder performance qualification for both processes per QW-416. "QW-402.4 The deletion or the backing in single welded groove welds. Double welded groove welds are considered welding with backing." John From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Venkateswaran
Sent: Wednesday, March 23, 2011 4:11 AM
To: materials-welding@googlegroups.com
Subject: [MW:10463] Backing As per ASME SEC IX ,we qualified PQR(SMAW/GMAW process) with 8mm/10 mm thickness plate full penetration welding( Root Land:1mm to 1.5 mm) as root ,hot and cap welding and then back/root side of plate was grounded(approx 2mm) to sound metal and one pass of cap welding was done in root side. My question is whether is method is considered as welding with backing or with out backing it is considered as backing. how? Regards, kvr --
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents. --
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
| -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
|
--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at
http://materials-welding.blogspot.com/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
No comments:
Post a Comment