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Re: [MW:22959] difference between ER70 S-6 and ER70 S-3

By Materials & Welding
The only difference in those rods is the amount of silicon deoxidizers in them. They are identical
rods otherwise. The higher number at  the end means there is more silicon in the rod. So, -6 has
more than -3

The  more silicon IN -6 will help with contaminants and wetting of the weld pool but with TIG  it
makes the puddle a little harder to control. Prefer to use -6 for MIG as it makes a great weld with
Ar + CO2  or with pure CO2  gas.  O2 is removed out in the form of Mn O2 & SI O2.

SFA 5.18, ER-70S-3 generally has less low temperature impact properties. It provides  27 J impact
@ -20 Deg C. Both ER-70S-2 and Eh R-70S-6 will provide 27 J impact @ -30 Deg C and above.
 
ER-70S-2 filler wire with its triple deoxidizers (Al + Ti + Zn) is good with TIG and could be made
to meet min. impact at -30  (or) -46 deg. C. if manufactured specially.  On the other hand, ER-70S-6 
has  high Manganese and provide more UTS values comparatively..
 
You can try 80S-Ni filler Wire under SFA 5.28 and this filler provides impact @ -46 Deg C. Similarly
 while E 7018 provides  27 J at -30 deg. C  , E 7018-1 provides at -46 C.
 
Trust above details will help U to choose your right requirement.

C Sridhar.
Technical Adviser - Welding,
for Alsta Pristine Engineering Private Limited,. Bangalore
( SS, AL fabricators & A venture of Advance Eng. Inspection  & Welding Training Services). Chennai,
Mobile nos: 0 94449 71097, 0 7406 326326, 0 94445 21267.


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From: 'raouf salhi' via Materials & Welding <materials-welding@googlegroups.com>
To: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>
Sent: Monday, 9 March 2015 8:22 PM
Subject: [MW:22958] difference between ER70 S-6 and ER70 S-3

Dear expert ;

we have  to weld an ammonia liquid line ( temperature of service -33 °c) with ER 70 S-3 for penetration and E 7018 for filling and cap .

Our client ask to weld with ER 70 S - 6 because of better impact test proprities.

THis is true ?? please give me more details

Regards
 
SALHI Raouf
QA/QC Engineer

Tel: Morocco +212628979891
      Tunisia +21621458258
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