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Re: [MW:33019] Black soot in MIG

By Materials & Welding

how many passes are you welding. If it is more than one try FCAW for the 2nd pass as it would provide an scavenging action and forms light density slag of Al2O3

Thanks & Regards

J.Gerald Jayakumar



On Friday, 1 April, 2022, 05:16:43 pm IST, Anthony Dalisay <anthonydalisay6@gmail.com> wrote:


I thought of doing the same too, however, it will cost me down time to remove the surface aluminium of all the items (about 40k pieces). You are correct that it is natural tendency for aluminium to oxidize when diffused with the weld arc, although this seems to be illusive, would changing the gas flow rate(to higher), welding progression(from pull to push) and angle of torch and contact tip to work distance (CTWD) will help eliminate the black soot? I have not tried those I mentioned yet except adjusting the CTWD to much closer distance to base material but surely I will try and see if that would work. I you think I missed something out please feel free to mention it.

If this black soot still occurs, I might switch to High Purity Argon as my last resort and see if thats going to be a success. I let you guys know the result of this experiment shortly. I appreciate all your inputs.

Regards,
Anton

On Fri, 1 Apr 2022 at 7:10 PM 'james gerald' via Materials & Welding <materials-welding@googlegroups.com> wrote:
Sorry i mistook it to be aluminium alloy 7065. IN Aluminiumized sheets welded using carbon steel filler you can prevent black spots by removing aluminium  from the steel sheet in the area of welding  and avoid diffusion of Al into weld metal as Al as a naturally tendency to oxidize as Al2O3

Thanks & Regards

J.Gerald Jayakumar




On Friday, 1 April, 2022, 04:25:10 pm IST, Anthony Dalisay <anthonydalisay6@gmail.com> wrote:


This is actually for motorcycle industry and the base material is not of any kind of pure aluminium series. It is an aluminized sheet welded by a robotic MIG using a normal carbon steel filler wire. With given parameters in the email thread.

Regards,
Anton

On Fri, 1 Apr 2022 at 6:24 PM 'james gerald' via Materials & Welding <materials-welding@googlegroups.com> wrote:
seems to be like Aluminium alloy with slight additions of Zn, Mg & Cu mostly in Aerospace industries,

Thanks & Regards

J.Gerald Jayakumar



On Friday, 1 April, 2022, 09:26:43 am IST, Anthony Dalisay <anthonydalisay6@gmail.com> wrote:


Filler wire is ER70-6S @0.8 diameter size. 

On Fri, 1 Apr 2022 at 11:45 AM Kannayeram Gnanapandithan <kgpandithan@gmail.com> wrote:
what is welding rod classification

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


On Thu, Mar 31, 2022 at 3:36 PM '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
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