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Posted by Potblak on May 16, 2007, 10:43 am
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> signaturefactory@signaturefactory.com wrote:
>
>> > Are you keeping the torch at a steep angle (around 70 - 80 degrees)?
>> I was.
>> > Are there any drafts in your shop?
>> There shouldn't have been.
>> > Is the metal really clean?
>> Probably not as clean as it could have been. I just wire brushed it
>> and nothing else.
>>
>> I'll pay more attention to those three things next time I weld.
>> Should an aluminum joint always be shiny?
>
> Yes unless you are getting etching from the high frequency, or the metal
> or filler rod is dirty
I've also seen that dull appearance caused by excessive gas or 'jetting' of
the sheilding gas.
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> patches after welding that look pretty shiny but the rest of the weld
> is dull. Is the entire joint supposed to be shiny? For instance
> today I did two different welds. Both looked good except for the
> dullness. Both were using a Dynasty 300DX with a watercooled torch.
> One was:
>
> 1/4" fillet with 4043 filler.
> Argon: 15 CFH
> Tungsten: 3/32" lanthanted (2%)
> Gas lens collet with #8 cup
> Current 250A
> Frequency: 120 HZ
> Balance: 65%
> Tungsten extended approximately 1/4"
>
> 1/8" butt with 4043 filler.
> Argon: 12 CFH
> Tungsten: 1/16" lanthanted (2%)
> Gas lens collet with #8 cup
> Current 110A
> Frequency: 120 HZ
> Balance: 65%
> Tungsten extended approximately 1/8"