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Re: [MW:33006] Black soot in MIG

By Materials & Welding
Hi Anthony 

You may please try with 99.9995% Ultra Pure Argon gas. Use a gas cup size of 20#.

Use the forehand technique in MIG.
MIG always works with DC, for GTAW you should go with AC.

Use a better quality branded filler wire spool.

Regards 

Prem Nautiyal 
Welding & NDT Specialist 
Cell 9769316004

On Thu, 31 Mar 2022, 15:36 'james gerald' via Materials & Welding, <materials-welding@googlegroups.com> wrote:
Try AC current

Thanks & Regards

J.Gerald Jayakumar




On Thursday, 31 March, 2022, 01:03:59 pm IST, Anthony Dalisay <anthonydalisay6@gmail.com> wrote:


Dear experts,

We have been welding aluminized sheet using MIG welder with the following parameters:

Amps: 125
Volts: 29.5
TS: 50cm/min
Gas flow rate: 12L/min
Gas type : 18%CO2 and 82%Ar

However, I cant get rid of black soot (smoke) in the weld vicinity. What do you think, is the best way to do to achieve cleaner weld in aluminized sheet such as this? 

Refer to attached photo for reference.



Thanks in advance for your expert advice.

Regards,
Anthony
--
Anthony Dipasupil Dalisay
TWI AWeldI

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