Dear binu,
First of all,our welder will not decide that what type of electrodes we should have to use.we should have to first establish the WPS it must be approved by client.As per Approved WPS by client we should have to follow that welding procedure and we can do welding as per WPS.if your welding is not done as per that welding procedure or u did not followed that welding procedure or it is opposite of approved procedure it is not desirable in that case you are wrong.
A333 Gr 6 is LTCS(Low temperature carbon steel) material.we can weld that material by E-7018-1 Only.we cant use that electrode directly in welding, first prepare test coupon of that electrode by welding of plates as per ASME Section-II Part-C and send for electrode qualification test in the approved lab by client where it will be gone for chemical test and impact test.
Before use of E-7018-1 it should be impact tested at -46 C with permissible acceptable criteria of impact energy and acceptable limit of chemical composition during chemical test as per ASME SEC-II Part- C or client specification.
There is no any NDT method to know which electrode you used for welding.But we can only assume that if there is not any material available other than LT CS(A333 Gr 6) and you use E-7018, i sure that joints welded by E-7018 only but if also not any electrode available other than E-7018.
E-7018-1 is used in low temperature services.so we can use only E-7018-1 electrode for welding of LTCS material.
Regards,
Engineers India limited,
hemal chauhan.
From: Biplab Pal <biplab.mech@googlemail.com>
To: materials-welding <materials-welding@googlegroups.com>
Sent: Tuesday, 16 April 2013 2:17 PM
Subject: Re: [MW:17434] E 7018 used instead of E7018-1
Your Client is right if Client Specification says about selection of electrode.
On Tue, Apr 16, 2013 at 9:52 AM, kannayeram gnanapandithan <kgpandithan@gmail.com> wrote:
pl ref ASME sec 9 QW404.12 (e)--
On Mon, Apr 15, 2013 at 4:38 PM, Binu Nair <binugnair1984@gmail.com> wrote:
Design temperature range is -46/300--
On Sun, Apr 14, 2013 at 3:08 PM, Roy <standardliu@hotmail.com> wrote:
E7018-1 is better than E7018 in low temperature @-40℃.Once you have impact requirement, you can not use E7018 directly.RoyBohler WeldingFrom: Binu NairSent: Sunday, April 14, 2013 6:11 PMSubject: [MW:17385] E 7018 used instead of E7018-1Dear Experts,Our welders are used E7018 instead of 7018-1 for A333 Gr-6.Now client is asking to cut the joints.Moreover they are asking to prove the remaining joints whether they are welded with 7018-1 or not.Can anybody suggest a suitable method such as any NDT to prove that ?So please send your valuable suggestion with reference to code.Thanks & regards,Binu.--
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Thanks & Regards
Biplab Pal
Welding Inspector
Biplab Pal
Welding Inspector
E-mail: biplab.mech@gmail.com
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Information in this email and any attachments is confidential and intended solely for the use of the individual(s) to whom it is addressed or otherwise directed. Please note that any views or opinions presented in this email are solely those of the author and do not necessarily represent those of the Company. Finally, the recipient should check this email and any attachments for the presence of viruses. Myself accepts no liability for any damage caused by any virus transmitted by this email.
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