Trouble with inside corner welds

[B_C]

Happy Thanksgiving...

[Don52]

Thanks for the help.

[B_C]

As is...Depending on the mix...Most Alumix bottles have 75 argon 25 helium...You can get Alumix
with 75 helium 25 argon which is pretty aggressive for thinner material..

[Don52]

I noticed that my Airgas LWS sells Alumix. Would you recommend using that as is or purchasing a cylinder of helium and mixing it with Argon?

The web site said call for price. Any idea of the cost?

[B_C]

Unless it's thin material I use Alumix gas on all aluminum. It's just so much nicer. And I kinda like EASY...Easy is good. You have helium,
take advantage of it....I mix it with argon all the time to help wet out those hard spots... Sure you can pre-heat that thick stuff but unless it is really thick and big I use more helium...

[Don52]

I like to start from the outside and weld to the corner from both sides rather than a continuous bead.. and then hit it hard after I'm done in the center of the corner

Thanks for your input. I will try that technique.

I noticed that the second leg of the weld flowed better then the first, because the metal was pre heated. The pictures that I posted were my practice pieces. The actual part was a 1/8 x 1 x1 Angle welded into a 20" x 20" frame. I noticed that the welds on the actual part didn't flow as well as the sample piece. I believe that the longer pieces of angle acted as a heat sink that cooled down the weld. Would you preheat for this weldment?

[B_C]

I like to start from the outside and weld to the corner from both sides rather than a continuous bead..
and then hit it hard after Im done in the center of the corner...It doesn't offer
any more strength, but I like the way it looks...(That's what happens to you when you are asked for COSMETIC welds) Setting your wave to penetration side helps keep everything tight also

[Don52]

I have trouble achieving an even weld and getting the aluminum to flow into and around the corner for inside corner welds. I end up with an uneven weld with a larger weld in the corner as shown in the attached pictures. I need to heat up the corner for a long time to get it to flow. Any tips or tricks would be appreciated.

Current: 160 amps
Frequency: 250 Hz
Tungsten: 3/32 Tri Mix
Balance: 70%

BC your inside corner welds always look so uniform. Anything that you can share on how to do this?