difference between ER70 S-6 and ER70 S-3

[raouf salhi]

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

[c sridhar]

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.

Please don't print this e-mail unless you really need to. Save the environment.

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

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[Srini Vasan]

It's Better to use ER70S-6 instead of ER70S-3 as both of in the same F no.
If you compare both MTC of the filler wire, you can find better impact properties in ER70S-6.

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[LALU RAJENDRAN]

Hi,

Yes, the impact properties of ER 70S-6 (27 J at -30°C) is better than that of  ER 70S-3 (27 J at -20°C)

Please refer Sec II Part C SFA 5.18

Regards,

LALU

LINKS MIDDLE EAST

ABU DHABI, UAE

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[Pawan Tiwari]

Dear Sir,

You have to use ER70S-6 for better impact properties (-30deg.) in the weld metal and also suggested by your client.

If you select low S & P (<0.012%) consumable in ER70S-6 class (100%CO2 shielding) than you can achieved up to -40deg. Impact too.

 

Rgd

P.Tiwari

QA & QC-Head

 

From: material...@googlegroups.com [mailto:material...@googlegroups.com]
Sent: Monday, March 09, 2015 8:23 PM
To: material...@googlegroups.com
Subject: [MW:22958] difference between ER70 S-6 and ER70 S-3

 

Dear expert ;

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