Re: [MW:25420] Re: Using of ER70S-6 in place of ER70S-2

Your comment on ER70S-6 is most certainly untrue.  GTAW with ER70S-6 will yield superbly clean welds and exceed all X-ray requirements provided the base metal is clean to start with.  The bonus is that ER70S-6 will have significantly better impacts than ER70S-2 especially when PWHT is required.  In my experience, welders seem to like the flow and wetability characteristics of the -6 over the -2.   The downside of -6 is that as the Mn and Si are higher, it is more difficult to reduce the hardness of the weld.  Also, to meet many petro-chem requirements for A1 chemistry limits for carbon steel filler metals, one often has to specify a maximum of 1.6% Mn and 1.0%Si.  This typically is not a problem for filler metal suppliers.

Triple deoxidized ER70S-2 is often preferred for the first pass of an open root joint.  But the presence of these deoxidizers leads to welds with far more inclusions (microscopic SONIMS) than with -6.  The plethora of SONIMS results in the overall poorer impact performance. 

Enjoy - 

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From: 'c sridhar' via Materials & Welding <materials-welding@googlegroups.com>
Sent: Saturday, September 17, 2016 6:10 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:25410] Re: Using of ER70S-6 in place of ER70S-2

 

You have not mentioned the welding process in use at your end

If it is TIG, flat no. as 70 S2 contains triple deoxidisers Al, ZN & Ti and used with argon gas.

ER 70S06 does not have them and will not give x-ray quality welds.

If it is MAG/CO2 process or with argon gas, you can go ahead. 

Ti addition alone with 70 S6 do not help. S6 also contains excessive Mn & Si and not used for 

TIG process.

Sridhar.

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From: sanjeev singh <sanjeevsinghfbd@gmail.com>
To: Materials & Welding <materials-welding@googlegroups.com>
Sent: Thursday, 15 September 2016 11:40 AM
Subject: [MW:25396] Re: Using of ER70S-6 in place of ER70S-2

Please guide- If we add Ti in ER70S-6 in range of 0.011%, what will be the effect during CO2 welding?

regards,

Sanjeev

On Thursday, 10 January 2013 12:13:36 UTC+5:30, Ranendra Chakraborty wrote:

Dear Expert,

Please guide whether ER70S-6 can be used in place of ER70S-2. Please give code reference.

 

Regards,

Ranendra

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