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Posted by Bob La Londe on July 18, 2008, 10:22 pm
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http://img522.imageshack.us/my.php?image=pict0065pg2.jpg
Well. my very first aluminum weld is not as bad as I feared. I definitely
worked outside the parameters that Miller says. This is unknown alloy tube,
although most of the tube I have seen locally that is labeled is a 6000
series.. Its only .043 thick side wall which puts it between 17 and 18
gauge. Since Miller says you shouldn't even try anything thinner than 14
gauge I'm pretty happy with my first weld. I wouldn't want to do a lot of
this type work. You have to move really fast, and when it gets away from
you you're done. Still, its a relatively clean weld until I almost melted
through. I think I could get to where I could do this pretty easily on a
straight weld like a lap joint or a corner joint between pieces of flat
where I only have to move the gun in one direction instead of try to rotate
it around the stock.
I reduced the power way below what it says on the chart for 14 guage.
Good choice.
I might try it again at the lowest power to see if I can work a little
slower.
Reduced the wire speed.
Bad choice. The wire won't melt and apply any slower.
The other side looks ok, but it is worse than this side.
I turned the wire speed back up for this side.
I cranked up the Argon to 30CFM.
I think this was a good choice.
My thought was more gas might keep the weld cooler and reduce burn through.
I think it worked as well as can be expected.
Interestingly I think the start of the weld looks pretty good, and the end
is what looks bad. Usually the reverse of what I get when welding steel.
It is not a pretty weld but I think it will hold ok, and I am not unhappy
for my very first attempt. Now I'm gonna chuck it up in the vice and try to
beat it apart with a hammer. I think the first 3/8 to 1/2 inch from where I
started actually looks pretty good.
Bob La Londe
www.YumaBassMan.com
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Posted by Bob La Londe on July 18, 2008, 10:46 pm
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Oh, yeah, the gun on demand thing is really freaking cool. Literally set
your spool gun down, adjust speed and power for your stock and immediately
start welding with your regular mig gun. This machine is pretty darned
awesome.
Oh, yeah. The tube 'T' didn't come apart. I bent it every which way until
the metal started to fatigue and crack, but the weld held. I tried to make
another one too. Good news - I could duplicate the results. Bad news - I
could duplicate the results. Good weld about half way, and just barely
pulled off in time to prevent burn through just like the first one. I have
not tried reducing power further yet. That's next.
> Bob La Londe
> www.YumaBassMan.com
>
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Posted by Bob La Londe on July 18, 2008, 10:52 pm
Please log in for more thread options > Oh, yeah, the gun on demand thing is really freaking cool. Literally set
> your spool gun down, adjust speed and power for your stock and immediately
> start welding with your regular mig gun. This machine is pretty darned
> awesome.
>
> Oh, yeah. The tube 'T' didn't come apart. I bent it every which way
> until the metal started to fatigue and crack, but the weld held. I tried
> to make another one too. Good news - I could duplicate the results. Bad
> news - I could duplicate the results. Good weld about half way, and just
> barely pulled off in time to prevent burn through just like the first one.
> I have not tried reducing power further yet. That's next.
I almost forgot. I held it together in a solid aluminum vice while welding.
I think that might have helped act as a heat sink to take away some of the
heat initially on each weld. It could be why it starts out good, and then
wanted to burn through near the end. My heat sink is heating up faster than
it can drain away the excess heat.
I don't know. Aluminum welding is all brand new to me. Its interesting
though trying to figure out how to apply all the "book" knowledge to do real
work.
>> Bob La Londe
>> www.YumaBassMan.com
>>
>
>
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Posted by Bob La Londe on July 18, 2008, 11:37 pm
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It actually looks like my first guess at settings was about the best. Lower
power didn't work at all. I tried varying the gas flow rate, but 30CFM
seems to give about the best results. The only thing I haven't tried is
cranking up the power and trying to go faster, but somehow that seems
counter intuitive to me. I can barely keep up with this thin metal at this
power setting. Still, I now have a pretty good idea about what my lower
limit is for material and job size. I definitely won't be welding any soda
cans together with this one.
Now to go get some dinner.
This is fun figuring it out. Yeah, I'm sure I could take a welding class
and save hours of experimentation time and get down to practicing, but I
think this way I'll have a better "feel" for my equipment. Not only will I
know what it will do, but I am learning what it won't do.
(Besides I actually have a use for those little aluminum "T"s.) I think in
the future, solid rod stock might be a lot easier to work with though.
>>> Bob La Londe
>>> www.YumaBassMan.com
>>>
>>
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Posted by Ignoramus2031 on July 19, 2008, 12:50 pm
Please log in for more thread options Bob, I think that it looks great. The most interesting part is to try
destructive testing to see how good the weld is in reality. Or just
cut it apart with a hacksaw. Or both.
i
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