All that aside, almost any welder can tell you why E6010 or E6011 electrodes are preferred for welding open roots in the field. This information can easily be found in older basic welding texts. Note that Lincoln Electric historically referred to these electrodes as "fast freeze". The cellulosic electrodes have deep penetration but more importantly the light slagging nature results in very rapid solidification in comparison to comparable sized electrodes of other classes. Because the slagging is light, there is no problem with controlling slag to prevent rolling under arc. The deep penetration assures that, with proper manipulation, side wall fusion is complete. With a proper whipping technique, varying gap (root opening) can be accommodated with little or no problem due to the rapid solidification (fast freeze). The light slag combined with the deep penetration also minimizes the potential for slag inclusions.
Because of the high diffusible hydrogen content, typically only root will be made with the 10 or 11 rod. Subsequent passes made with low hydrogen, E7018. This limits the potential for hydrogen assisted (delayed cracking). Of minor importance is that appearance also would suffer as 10 or 11 rods typically appear rough and ropey.
Sometimes it pays to look for the old, simpler information.
Enjoy.
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of JIJILAL K M
Sent: Thursday, May 26, 2016 6:00 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:24883] E6013 not Applicable for High Thickness material
Dear KGP,
Your explanation in cellulose electrode arc character and its intention for using pipeline root pass welding is very correct.
JIJILAL K.M.
QA/QC Manager,
Thai Jurong Engineering Ltd,
KCE SPP Project,Thailand
#096 786 0129
On 26 May 2016 at 16:44, Kannayeram Gnanapandithan <kgpandithan@gmail.com> wrote:
to my knowledge, 6010 is having around >30<60ppm of Hydrogen. During welding, in high temp, it decomposes cellulose & water which generate carbon monoxide and high level Hydrogen
Hydrogen is poor electrical conductor and has the high ionization potential that causes the resistance of the Arc opening to increase and Electron emission to decrease, which result in a higher Arc Voltage and more penetrating Arc, that is why it is being used in cross country pipeline for root run
THANKS & BEST REGARDS,
KG.PANDITHAN, IWE, AWS-CWI, CSWIP 3.1,
CONSULTANT-WELDING & QUALITY
Mobile no: +919940739349
On Thu, May 26, 2016 at 1:21 PM, Lakshman Kumar. B <lakshmankumar4@gmail.com> wrote:
Hi friends,
Generally 6010 which is cellulose type coted electrode for root pass, and for fill & final runs preferred for 6013…
6010 is burning on DC+(reverse polarity), whereas 6013 can burn in AC, DC (+/-)…
This is also one reason 6010 gives good penetration…
There is no technical code that 6013 should not be used for higher thickness (say above 20mm) – if anyone is having any code references in this regard please correct me…
It becomes a practice to client to say, use "good electrode" than a regular one – "as I am putting more money to purchase a high thick material and it's a complicated work(so only going for high thickness)" – there is no logic behind this….
Further this is my personal experience – for 25mm thick I used 6013 with proper WPS –
6013 is widely used electrode as a reason of free availability and low in cost, that's so clients are thinking to propose a higher grade than existing…
By using 6013 we can develop weld qualities of RT with "NSD" and without any additional efforts and is easy to weld…
No doubt that 7018 is having its advantages than 6013 – but it's not limited / connected to base material thickness
So, don't get confused that for higher thickness 6013 is not suitable –
Thanks & Regards,
Lakshman Kumar B,
+91 9440031459.
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of JIJILAL K M
Sent: Thursday, May 26, 2016 12:45 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:24880] E6013 not Applicable for High Thickness material
Dear KGP,
E-6010 cellulose electrodes have an unique feature of high penetration arc jet , which ensure sufficient fusion and penetration during root pass welding.
when we train cross country welders, ask them to note jet sound during the entire course of each electrode which it self confirm correct penetration.
JIJILAL K.M.
QA/QC Manager,
Thai Jurong Engineering Ltd,
KCE SPP Project,Thailand
#096 786 0129
On 26 May 2016 at 11:09, Kannayeram Gnanapandithan <kgpandithan@gmail.com> wrote:
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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