Hi all
I have a quastion on welding of building structure .The base metal is
ASTM A36 (DIN ST37),
Is it allowed to use E6010 electrode for welding root pass of complate penteration of groove joints, Acording to AWS D1.1 or NOT.
I could not find it in this standard cleary.
Thanks for any help.
I hear that 60 series is used a lot in the field for root passes. It would depend on what is in the contract documents, which usually stipulate the use of E70XX electrodes on structural projects. I would think that a good welder can weld the root without using 60 series.
Table 3.1 in the AWS D1.1-2004 has E60XX electrodes as acceptable for use on A36 < or = ¾".
Like others have said, check the contract documents, but sometimes it's permissible to use E6010 on the root pass of a double-V when that root pass will be gouged out when the back side is done, even if otherwise E6010 is not permitted.
Hg
Link to a good article by Duane Miller "Use Undermatching Weld Metal Where Advantageous"
http://www.jflf.org/pdfs/papers/design_file7.pdf
It's up to the designer, not the welder, to decide if undermatching is okay.
Also E6010 is a different story from E6018.
Hg
Review AWS D1.1 for the requirements for complete joint penetration groove welds. CJP from one side without backing is not prequalified. Consider back gouging the root so you are welding from both sides, thus complying with the requirements of a prequalified joint.
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