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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Kannayeram Gnanapandithan
Sent: Thursday, May 26, 2016 11:09 AM
To: materials-welding
Subject: Re: [MW:24874] E6013 not Applicable for High Thickness material
JKM, Why 6010 is preferred for root run in cross country pipeline welding?
THANKS & BEST REGARDS,
KG.PANDITHAN, IWE, AWS-CWI, CSWIP 3.1,
CONSULTANT-WELDING & QUALITY
Mobile no: +919940739349
On Thu, May 26, 2016 at 9:09 AM, JIJILAL K M <jijilalkm2@gmail.com> wrote:
Dear Amit,
Recommending E-7018 for higher thickness structure steel welding is by considering following factors.
1, When thickness increase the load bearing capacity of structure increases - so flaw less welding required.
since 7018 is low hydrogen type we can ensure less hydrogen induced weld defects by maintaining
proper electrode baking before welding.
2, As per structure code , full penetration butt weld joints required RT/UT, fillet joints need MT/PT.
here E-7018 is better option than 6013
3. For thicker sections , more layer of welding /deposition required. other than 6013 , E-7018 flux having iron in fine powdered form which will supplement 15-20% additional metal in deposited metal(called high deposition efficiency).This will help for minimum usage of manpower , filler metal, electric power .
4. E-7018 required more welding skill from welder side. So only qualified welder shall be used. All this will assure you good quality welding in the end if you prefer E-7018 electrode.
JIJILAL K.M.
QA/QC Manager,
Thai Jurong Engineering Ltd,
KCE SPP Project,Thailand
#096 786 0129
On 26 May 2016 at 00:40, Varun Ur <urvarun@gmail.com> wrote:
Dear amit
6013 can be used for higher thickness for structural weld but was D1.1 calls for pre heat for thickness above 20 MM , if you are using low hydrogen coated electrode you can skip this pre heat requirement up to certain thickness.
Also you get higher deposition rate for 7018.
And of course you can get good radiographic quality weld with 6013 also.
So weigh your pros and cons based on application limitations.Cheers
VarunDear Expert
It has been observed that practically that E6013 electrode generally used for low thickness material i.e less than 20mm thickness however E7018 become mandatory for high thickness on the same material in structural work.
Kindly give your opinion refer to standard.
Regards
Amit Vishwakarma
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