Shielding gas for GMAW pulsed welding-Carbon Steel

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Aby Jose

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Mar 21, 2017, 6:57:30 AM3/21/17
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Dear all,

What shielding gas should be used for the pulsed GMAW welding of carbon steel? When trying with 80%Ar+20%CO2 mixture I am getting a lot of spatters. The welding used is Automatic welding with Robotic machine.
Any recommendations???

Regards,
Aby

Kannayeram Gnanapandithan

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Mar 21, 2017, 8:03:01 AM3/21/17
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what are welding parameters

THANKS & BEST REGARDS,
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CONSULTANT-WELDING & QUALITY
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PGoswami

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Mar 21, 2017, 8:33:58 AM3/21/17
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Hi Aby,

 

More enriched version of mixed gases, e.g. 90Ar+10 O2 or other Ar enriched blends may help. Look at this guide ,which has few  good recommendations about shielding gases.

 

Thanks.

 

P.Goswami,P.Eng,IWE.

 

https://www.lincolnelectric.com/assets/global/products/consumable_miggmawwires-superarc-superarcl-56/c4200.pdf

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Prasad Rao

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Mar 21, 2017, 10:46:43 PM3/21/17
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Try for 98% argon and 2% co2

On Tue, Mar 21, 2017 at 12:56 PM, Aby Jose <abyc...@gmail.com> wrote:
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Dear all,

What shielding gas should be used for the pulsed GMAW welding of carbon steel? When trying with 80%Ar+20%CO2 mixture I am getting a lot of spatters. The welding used is Automatic welding with Robotic machine.
Any recommendations???

Regards,
Aby

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Kannayeram Gnanapandithan

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Mar 21, 2017, 11:35:55 PM3/21/17
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As argon increase, %of penetration will come down and may get into porosity .  Try with 85+15 with current of >250amps. spatter is inevitable in this process, u can reduce by another option with GMAW-P. If u work in Spray mode, spatter stiking into base metal will be less due to its sizes

THANKS & BEST REGARDS,
KG.PANDITHAN, IWE,  AWS-CWI, CSWIP 3.1,
CONSULTANT-WELDING & QUALITY
Mobile no: +919940739349

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Diganta Sarma

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Mar 21, 2017, 11:47:37 PM3/21/17
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A 20% carbon di oxide mix in a 80% argon usually works best in spray transfer mode in w position so you would need to ensure that you aren't using short circuiting mode which is resulting in large amount of spatters. In case you're welding thin sheets or doing out of position welding you may have to consider changing the gas mixture 

Trust this helps

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Perumal Govindan

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Mar 21, 2017, 11:59:51 PM3/21/17
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Hi Jose,
Please let me know the AWS classification of filler wire and brand used or please follow the manufacturer recommendation for choosing the shielding gas or refer the filler wire data sheet.

Regards
P Govindan

Aby Jose

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Mar 22, 2017, 2:37:49 AM3/22/17
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Hi Perumal,

I am using ER 70S6 and the manufacturer is Bohler.

Regards,
Aby

Aby Jose

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Mar 22, 2017, 2:37:55 AM3/22/17
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Dear Mr Pandithan,

In the machine I have selected the pulse mode itself. (GMAW-P). The position I am using is IG(rotating ) . As I am using the synergy mode in the machine the current and voltage is getting selected automatically when I am giving the wire feed speed. I am using the wire feed speed of 9.5 m/min, the voltage coming is in range 25V -28V and current in range 215 to 230. How to ensure I am not using the short circuiting mode?? I am using this process for pipe welding which includes both high and low thickness.

Regards,
Aby

Kannayeram Gnanapandithan

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Mar 22, 2017, 9:50:10 AM3/22/17
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Voltage anything less than 21v goes to short circuit, but in ur case Voltage is ok, but increase the current to minimum 250amps, Do not put in Synergy mode and set the Current as required.

THANKS & BEST REGARDS,
KG.PANDITHAN, IWE,  AWS-CWI, CSWIP 3.1,
CONSULTANT-WELDING & QUALITY
Mobile no: +919940739349

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Dear Mr Pandithan,

In the machine I have selected the pulse mode itself. (GMAW-P). The position I am using is IG(rotating ) . As I am using the synergy mode in the machine the current and voltage is getting selected automatically when I am giving the wire feed speed. I am using the wire feed speed of 9.5 m/min, the voltage coming is in range 25V -28V and current in range 215 to 230. How to ensure I am not using the short circuiting mode?? I am using this process for pipe welding which includes both high and low thickness.

Regards,
Aby
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Perumal Govindan

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Mar 23, 2017, 6:49:03 AM3/23/17
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Hi Jose,

As per data sheet of ER70S-6, Bohler EMK 6, recommended composition of shielding gas is Ar + 15 to 25% of CO2.

Regards
P Govindan

Aby Jose

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Mar 24, 2017, 12:31:38 AM3/24/17
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Yeah Mr Perumal. But by using Ar + 20% CO2 I am not able to control the spatter that is the problem.

Regards,
Aby

Aby Jose

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Mar 24, 2017, 12:31:41 AM3/24/17
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Dear Pandithan,

Here the wire I am using is of dia 1.2 mm. So is it possible to give the current & voltage of that range in the weld layers? The welding process I am following is Root & hotpass TIG and the balance MIG. 

Regards,
Aby

Kannayeram Gnanapandithan

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Mar 24, 2017, 1:46:10 AM3/24/17
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yes

THANKS & BEST REGARDS,
KG.PANDITHAN, IWE,  AWS-CWI, CSWIP 3.1,
CONSULTANT-WELDING & QUALITY
Mobile no: +919940739349

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Dear Pandithan,

Here the wire I am using is of dia 1.2 mm. So is it possible to give the current & voltage of that range in the weld layers? The welding process I am following is Root & hotpass TIG and the balance MIG. 

Regards,
Aby

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