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Posted by on February 6, 2008, 11:01 am
Please log in for more thread options On Dec 9 2007, 10:23=A0pm, dcas...@krl.org wrote:
> wrote:
>
> > I tried welding some aluminum tube last night without any luck. For one
> > it was the first time I ever tried AL welding with the exception of when=
> > =A0 the machine was demoed to me years ago. I am welding 1 3/4" 0.065"
> > wall 6061 T6 tubbing using a Lincon Square wave TIG machine. Problems
> > seam to be.
>
> > 1) I am usually unable to tell when the metal is molten, It doesnt glow,=
> > dance flow or do anything it just stays there until you touch it with a
> > rod, at which point you polk a big hole in it.
>
> > 2) OK so I sort of think I know when its molten but getting it to flow
> > seems impossable. It seams like I need more currernt but I started at 30=
> > Amps and went to 70 Amps could I possibly need more to weld 0.065 wall t=
ube.
>
> > 3) It also seams like the metal does not want to fuse together but just
> > stay to itself. Filler metal tends to just form a ball and stay on top.
>
> > 4) I'm thinking maybe its dirty but I cleaned it with a scotch bright
> > pad on a angle grinder. I havent cleaned the inside of the tube so I
> > will try that next.
>
> > I was last using about 70 amps AC TIG mode, Gas was Argon as high as 20
> > CFH. filler 3/32 4043. I dont have anything thinner at the moment. I was=
> > using 1/16" 2% Thoriated tungsten flat and chamfered tip.
>
> > Can anyone post some tips and a recomended setup.
>
> > Thank You
> > John Roncallo
>
> If you have not welded aluminum for a long time, I would practise on
> some flat stock. =A0Just try getting a puddle on some =A01/8 inch to 1/4
> inch thick flat stock and then moving the puddle along. =A0And use
> Lantheumated , Ceratied, or pure tungsten. =A0Ball the tip.
>
> It sounds as if you don't have quite enough amps to me.
>
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0Dan
It sounds to me like you may be trying to weld anodized aluminum.
Make sure to use raw aluminium. These folks may be able to help you:
www.saf.com
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> it was the first time I ever tried AL welding with the exception of when
> the machine was demoed to me years ago. I am welding 1 3/4" 0.065"
> wall 6061 T6 tubbing using a Lincon Square wave TIG machine. Problems
> seam to be.
>
> 1) I am usually unable to tell when the metal is molten, It doesnt glow,
> dance flow or do anything it just stays there until you touch it with a
> rod, at which point you polk a big hole in it.
>
> 2) OK so I sort of think I know when its molten but getting it to flow
> seems impossable. It seams like I need more currernt but I started at 30
> Amps and went to 70 Amps could I possibly need more to weld 0.065 wall tube.
>
> 3) It also seams like the metal does not want to fuse together but just
> stay to itself. Filler metal tends to just form a ball and stay on top.
>
> 4) I'm thinking maybe its dirty but I cleaned it with a scotch bright
> pad on a angle grinder. I havent cleaned the inside of the tube so I
> will try that next.
>
> I was last using about 70 amps AC TIG mode, Gas was Argon as high as 20
> CFH. filler 3/32 4043. I dont have anything thinner at the moment. I was
> using 1/16" 2% Thoriated tungsten flat and chamfered tip.
>
> Can anyone post some tips and a recomended setup.
>
> Thank You
> John Roncallo