Re: [MW:16497] Using of ER70S-6 in place of ER70S-2

Hi,

ER70S-6 has a higher mangnaese and silicon content giving this rod better tensile strength and smoother running characteristics then ER70S-2. Tensile strength is up to 88,000 psi. ER70S-2 is a triple deoxidized mild steel rod which will give quality welds on most grades of steel. Tensile strength if 77,000 psi.  Both are available in rod (GTAW) as well as spool form (GMAW). With respect to ASME Section IX, when using in place ER 70S-2, b sure u r checking the A No. of ER 70S-6, as sometimes the chemical composition varies. if its matching then you can use.
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regards,
Dsilva

Sent from my iPhone

On Jan 11, 2013, at 9:17, kannayeram gnanapandithan <kgpandithan@gmail.com> wrote:

Can be used provided if it is available in rod for TIG process.

Generally ER70S2 comes in rod form for TIG welding not in spool form for GMAW process because in GMAW process, Titanium gets oxidided in arc itself and purpose of Ti adding is lost, so it is not at all used in GMAW process.

ER70S6 comes generally in spool forms for GMAW process and if it comes in rod, it can be used in TIG process

Pandithan

Welding Consultant

On Thu, Jan 10, 2013 at 7:48 PM, c sridhar <sridhar305@yahoo.com> wrote:

Mr. Chakraborthy,

You have not given  the  process details. Is it MIG or TIG process.

In general:

For TIG process, we use ER 70S-2 for CS welding. The shielding gas used will be Argon. Radio graphic
quality is assured due to addition of Ti, Zn & Al which removes Oxygen  by forming faster oxides with it
along with Mn.& C. ER 70S-6 is available in spool form ( 15 kg  or so) and not used for TIG process as it
can not provide X-ray quality welds

For MIG process, ER 70S-6 is generally used with  Carbon-DI-oxide as shielding gas. ER 70S-6 has
excessive Mn & Si  (1.85 & 1.15 %  respectively) compared to 1,4 & 0.7 % in ER 70S-2 filler wire,
Additional Mn, & Si will remove oxides form CO2 gas to give good weld quality, but consistency to
provide x-ray quality is a question mark. ER 70S-2 could also be used but, only with Argon gas.

Sridhar.om: Ranendra Chakraborty <ranendrac6@gmail.com>

To: materials-welding@googlegroups.com
Sent: Thursday, 10 January 2013 12:13 PM
Subject: [MW:16480] Using of ER70S-6 in place of ER70S-2

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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