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  #11  
Old 09-04-2017, 07:34 PM
Jerry Jackson Jerry Jackson is offline
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Where do you buy 91% isopropyl alcohol in gallon containers? The pint containers at drug stores gets expensive.

Jerry
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  #12  
Old 09-04-2017, 10:00 PM
crystallographic crystallographic is offline
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Dunno.

How about ....
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  #13  
Old 09-05-2017, 01:33 AM
Andy Andy is offline
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Richard, I must say that the light in the picture exagerates the 'pits'. It did not look that bad. But I must admit that this weld could be one of the welds I did with a heavy fuel rich flame...just to see what it did.

And yes...I did not think that bad acetylen is an issue here, too. But looking at my current bottle...it is very old. Under the standart color code you can glimpse the old color code of those bottles. So I thought that possible before I startet this thread.

I did weld aluminium with o/a some years back. Different setup, different supplier. No problems. I was just starting back then. I have been welding steel sheet for years now, but with steel dirty ace is not a problem.

As it becomes more and more likely that I will build an aluminium fuel tank in the near future, I wanted to get back into AL welding. Since TIG is not an option for me right now...too expensive and I am in doubt if it is te right thing to use on fuel tanks. I have seen how a steel TIG weld can behave when stressed. And I know what I can do with my o/a steel welds. But I do not want to start this discussion all over again. Both ways have their pro's and con's. The important thing for me is: the weld on a fender or a little hood like the one shown only has to hold the pieces together. The weld on a tank has to be airtight and lasting, largely immune to vibrations and so on.

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Quote:
Originally Posted by elavir View Post



Can it be something else? In this picture the weld doesn't look dirty to me but brittle.
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  #14  
Old 09-05-2017, 01:59 AM
Andy Andy is offline
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Quote:
Originally Posted by crystallographic View Post
Again, nice to see such sauber Verarbeitung.
Thank you for your nette Worte. Or better: Danke für die Blumen.

By the way...do you always have to coat the bottom of the sheet with flux? On a flange weld for examble, could you leave the 'touching' sides uncoated?

Or welding on a bung...do you need flux between the bung and the sheet?
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  #15  
Old 09-05-2017, 03:21 AM
dwmh dwmh is offline
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Nice job Andy, and I wish my Ali welds were as neat as yours.
I am in the UK but use an acetylene filter anyway (found on Ebay) The same type as Kent sells and I get my filter sleeves from Kent. I like to rule out as many variables as possible.
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  #16  
Old 09-05-2017, 03:41 AM
Oldnek Oldnek is offline
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WOW,

I really didn't think acet could get dirty as I always thought it was the shittyest gas anyway.
Must be like LPG here in OZ, how there throwing to much butane in it just to make it burn and not get hot.
I have noticed this on cars and BBQ;s .........................Lots of problems.

Just a Question, For Kent!
Is it the gas or the crap that is in the bottles when they fill them up.

Sounds like it's going like China, how they add plastic to rice....
Won't be long before a Million dollars will buy you good gas.
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  #17  
Old 09-05-2017, 10:01 AM
crystallographic crystallographic is offline
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Andy,
When welding new aluminum I only flux the rod because when hot, the flux runs like water into all crevices and gaps. Less flux into the weld means less flux to clean up.

John,
I have O/A weld samples going back to 1974 and the welds are very clean until 1989, and then they started getting gray and then even greasy because our local gas was soooo bad.

In the American aircraft factories during the 1930's O/A and O/H were used interchangeably, though on rare occasions the O/H would be specified. I have seen O/A welds on 1950's missiles (Smithsonian) - back when tig was just a kid. There is a difference in the weld appearance between O/H and O/A, but it takes a good (trained) eye to see it.
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  #18  
Old 09-08-2017, 01:30 PM
vroom vroom is offline
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Kent

Two quick questions:

Does using propane get rid of the dirty gas problem?

Do I need a new regulator to use propane?
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  #19  
Old 09-08-2017, 01:41 PM
crystallographic crystallographic is offline
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Quote:
Originally Posted by vroom View Post
Kent

Two quick questions:

Does using propane get rid of the dirty gas problem?

Do I need a new regulator to use propane?
Hi Tim,
I would not have considered that solution, but I guess so....
If your acet reg fits the threads on the propane can then you are good to go. Otherwise you have to get a fuel reg that fits propane bottles. Acet bottles have about 5 different thread fittings from the century+ that they have been used in different industries - autos, motorcycles, lighting, welding etc.
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  #20  
Old 09-08-2017, 04:35 PM
bobadame bobadame is offline
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I've used propane and oxygen to gas weld platinum. That worked great. Then I tried to gas weld aluminum with the same gasses. It didn't work. Don't remember exactly why not but maybe the chemistry was wrong.
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