Re: [MW:18900] Option for E6010 in root welding

   Dear sir,

thanks for your detailed reply.

just one query. why E7010 gives more hard slag and produce internal undercut while E6010 is not.instead E6010 gives more penetration.

means both is same EXX10 class and cellulose coated electrode (last digits are same 10)  than what makes them behave so much differently ? 

the only difference should be their tensile strength as per code. ?

regards,

On Tue, Oct 1, 2013 at 12:58 PM, Geoff Rogers <gbr476@gmail.com> wrote:

E6010 is used primarily for root pass welding because it has excellent penetration characteristics which helps ensure complete fusion of the root pass.  It is also good at preventing internal undercut.  E6010 can also be used for fill and cap passes for lower strength steels, ex API 5L X42 and lower.  

E7010 is also used for used for root pass welding but is more likely to cause internal undercut and produce a harder to remove slag that is not as easy to grind out or burn out with the second pass causing a defect know as "wagon tracks".  The slag is not a problem for fill passes as there is more room for grinding due to the wider bevel opening and will burn out because other fill passes are typically welded with higher heat input than the 2nd pass.  E7010 is commonly used for line pipe steel as all steel is an alloy steel; it just depends on the compatibility of the electrode with the steel alloy.  E7010 and E8010 are typically used for fill passes for higher strength steels.  

All EXX10 electrodes are cellulose electrodes and generate high levels of hydrogen that is retained in the weld.  The level of retained hydrogen can be reduced with higher preheat and keeping the weld hot after weld completion.

E7018 is not typically used for root pass welding since it contains higher levels of iron in the flux coating making it difficult to hold the puddle for a root pass.  E7016 can be used for root pass welding but the welders must learn how it operates to be successful with that rod.

--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
 
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.