GMAW change gas from 100 %CO to Ar+5%O2

EmaD FaRaHanI

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Apr 9, 2021, 8:33:27 AM4/9/21

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Dear all,

I faced a problem with penetration in fillet welds when decide to change the gas type, as mentioned.

Most welders are doing well with this change, but some make loser penetration.

Details: mild steel, 2F welding position, wire feed speed 450ipm (optimized), 10˚ push angle,

What could be the reason?

Thanks,

Ramin Kondori

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Apr 11, 2021, 10:52:15 AM4/11/21

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Why did you change the shielding gas...?

Ramin Kondori

Sr. QA/QC & Welding Engineer

-----------------------------------------------------------

PG-Dip. in Welding Engineering (IWE AT 0070)

BSc. in Civil Engineering (IUT)

BGAS Painting Inspector

ASNT Level I&II

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EmaD FaRaHanI

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Apr 12, 2021, 12:55:49 AM4/12/21

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Thanks Dear Ramin,

Because of lots of fume due to CO2

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Ahmed Osman

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Apr 12, 2021, 1:11:24 AM4/12/21

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this gas mix will be axial spray which is more penetration . if u face this issue only with some welders and others is OK , this may related to more welders training is needed . U can cut macro from one good welder and one u r doubted " using same parameters " then compare

Best Regards ,

Ahmed Osman

Kannayeram Gnanapandithan

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Apr 12, 2021, 4:38:02 AM4/12/21

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but u will get better penetration than mixture gas due to burried arc ( Repelled), and same u get more spatter, rough bead etc.

THANKS & BEST REGARDS,

KG.PANDITHAN, BE, IWE, CSWIP 3.1,

ISO 9712 Level 2 in VT,

ASNT-Level II in PT,MT,RT & UT,

LA ISO 9001-2015,

International Welding Engineer.

CONSULTANT-WELDING & QUALITY

Mobile no: +919940739349

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Ramin Kondori

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Apr 12, 2021, 8:07:14 AM4/12/21

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If the reason for changing the shielding gas has only been the issue of excessive fumes, I recommend you to switch back to CO2.

It's mild steel and unless it is necessary, the CO2 gas will do the trick.

It is not economically feasible to use Argon.

Kind regards

Ramin Kondori

Sr. QA/QC & Welding Engineer

-----------------------------------------------------------

PG-Dip. in Welding Engineering (IWE AT 0070)

BSc. in Civil Engineering (IUT)

BGAS Painting Inspector

ASNT Level I&II

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saeed sarir

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Jul 5, 2021, 6:26:21 AM7/5/21

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Below table can help you

Best regards

Saeed Sarir

IKA Technical Inspector

Phone number : +98 09132387465

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