I hope that you are aware that E 6010/ E 7010 are cellulosic electrodes, and it is widely used,
1. for welding the root pass and or all passes of single sided welds, most of the time for pipelines and flowlines welding.
2. for welding root pass of pipings under B31.3 scope, but with caution of slag on the root side.
3. To achieve a full penetration weld, the cellulosic electrodes produce a forceful spray type arc, which you not be able to achieve with a E7018 electrode due to its reletively soft arc.
the reason why E6010 is selected for root pass welding is mainly due to above mentioned facts and also you should note that E 6010 welds are deposited with downhill progresion, that means you'll only be depositing only a very thin root pass. this thin root pass doesnt contribute more from the design / strength point of view. more over the dilution of root pass by the adjacent base materials and the subsequent penetration of the hot pass will result in a root pass having chemical and mechanical properties away from that of an undiluted E6010 weldmetal.
Also please check one of your E6010 electrode batch certificates meeting the 70ksi requirements (most of the time), again it doesnt matter.
The second part of your question, you'll have to check SFA 5.5 instead of SFA 5.1 to find the requirements of 7010-G or E 7010-P1.
There are many manufacturers like Lincoln, Bohler-Austria, Thyssen-Germany, ESAB to give you 7010-G E 7010-P1.
Hope this is clear,
Regards,
A.Praveen
--- On Thu, 12/30/10, pradip kumar sil <pradipsil@gmail.com> wrote:
From: pradip kumar sil <pradipsil@gmail.com>
Subject: [MW:9025] Technical solution
To: materials-welding@googlegroups.com
Date: Thursday, December 30, 2010, 6:23 PM
Dear All,
When we use GTAW , we are using ER-70S2/E-7018( Same tensile) combination, alternatively in SMAW , we are using E-6010/E-7018( Different tensile) instead of E-7010. E-7010 is not available(as per ASME) in the market. Is there any technical problem to manufacture it or to use it.
Can somebody tell it.
Regards
Pradip
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