Re: [MW:4390] Aluminium Welding

Dear Randy,

Thanks a lot for your reply.. clarifies a lot of points.

Will give MIG welding a go and see the results.

Regards,

Nimesh S Chinoy

On Sat, Feb 27, 2010 at 4:54 AM, Dull, Randy <RDULL@ewi.org> wrote:

Mr Chinoy:

The electrode you used, LH 409, appears to be designed specifically for repair welding, and may be more suited for use on castings than for fabricating wrought aluminum plate.

Either TIG or MIG would be suitable processes for welding 5-mm thick 5052 plate, but MIG would generally be more productive. The preferred filler metal or electrode alloy for welding 5052 would be 5356.

The low strength of the fillet welds made using LH 409 electrodes is likely due to incomplete fusion to the base metal. Welding aluminum is more challenging than welding steel and most other metals due to the high thermal conductivity of the base metal. It is difficult to achieve complete fusion, especially at the start of the weld, using conventional arc welding. This is an area that TIG has an advantage, as you can hold the torch at the start until the weld pool is sufficiently large to add filler metal, thus ensuring better fusion to the base metal.

Randy

Randal M. Dull, P.E.
Engineering Team Leader - Arc Welding
EWI
1250 Arthur E. Adams Drive
Columbus, OH 43221
614.688.5095 (direct)
614.688.5001 (fax)
randy_dull@ewi.org
www.ewi.org

-----Original Message-----
From: Cooper, Kirk
Sent: Sunday, February 21, 2010 6:21 PM
To: Dull, Randy
Subject: FW: [MW:4349] Aluminium Welding

Randy - can you help?

Thanks,
Kirk
________________________________________
From: Ames, Nathan
Sent: Saturday, February 20, 2010 9:55 AM
To: Cooper, Kirk
Subject: Fwd: [MW:4349] Aluminium Welding

Thanks, Nate Ames

Technical Director | NFC
Eng. Team Leader | EWI
Mail: 1250 Arthur E. Adams Dr., Columbus OH 43221
Email: <mailto:names@ewi.org> names@ewi.org<mailto:names@ewi.org>
Cell: 614.578.7898

Begin forwarded message:

From: Nimesh Chinoy <nchinoy@gmail.com<mailto:nchinoy@gmail.com>>
Date: February 20, 2010 6:40:13 AM EST
To: "materials-welding@googlegroups.com<mailto:materials-welding@googlegroups.com>" <materials-welding@googlegroups.com<mailto:materials-welding@googlegroups.com>>

Subject: [MW:4349] Aluminium Welding

Reply-To: "materials-welding@googlegroups.com<mailto:materials-welding@googlegroups.com>" <materials-welding@googlegroups.com<mailto:materials-welding@googlegroups.com>>

Dear All,

Need to weld Aluminium of grade 5052 for 5mm thick plates in both BUTT and FILLET welding. Kindly suggest which type of power source (Arc, TIG, MIG) will be most suitable for this application.

We tried using LH409 welding electrode (3.2mm ) in EP mode. We get a good weld result with BUTT joints but Fillet doesnt hold any strength , any reasons why ?

--
Nimesh S Chinoy

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--
Nimesh S Chinoy

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