Re: [MW:18824] Option for E6010 in root welding

dear sir thanks for your reply.

1) i mean can we use other electrodes like E7010-P1 or E7018 in pipeline root welding or any other ?

3) Why we use E7010 electrodes in filling/capping with combination of E6010 in root for same API 5L X42 or A106 Gr.B carbon steel pipeline, if E7010 is for alloy steel ?

On Mon, Sep 30, 2013 at 7:08 AM, kannayeram gnanapandithan <kgpandithan@gmail.com> wrote:

E6010 is used only for root weld in pipe line because during welding (cellulose electrodes) decomposes cellulose + water, generates carbon monoxide and Hydrogen, Hydrogen gas is poor electrical conductor and has a high ionization potential that causes the resistance of the arc opening to increase and the electrons emission to decrease, which result in a higher arc voltage and more penetrating arc   

On Sun, Sep 29, 2013 at 4:07 PM, Srini Vasan <srinicwi@gmail.com> wrote:

E 6010 is most suitable for deeply penetrarion,also it reduces slag inclusion.but if we use E 7018 we cant achieve good penetration.E 6010 electrodes mostly utilized in pipelines,for deep penetration and good characteristics.

On 29 Sep 2013 13:26, "Octane Mac" <octane.mac@gmail.com> wrote:

1) Question is not clear. What do you mean by option?

2) E7018 arc is not deeply penetrating like of E6010

3) E7010-A1 contains 0.5% Mo unlike E6010. There isn't any similar E7010 like E6010. SFA 5.5 deals with alloyed steels and 5.1 with carbon steel.

Octane

On Sun, Sep 29, 2013 at 9:57 AM, Sam <onlyprivate2007@gmail.com> wrote:

Dear experts,

1) i want to learn that is there any option of E6010 in root welding of pipe by SMAW available ? i do know that same E6010 used for API 5L grade B, 42 and upto grade 60 also. 

2) If we use E7018 in root (when it suits UTS of base metal) , what is the main problem ? is it only about slag in inside face  and penetration ?

3) Why E6010 is AWS SFA 5.1 and same E7010 is AWS SFA 5.5 (both looks same except UTS) ?

please answer in details.

Regards,

sam.

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