Re: [MW:33016] Black soot in MIG

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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