#11
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OK, I guess the flux was too thick, next time I make it more milky like.
Cheers Richard.
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Richard |
#12
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I wonder if this back fluxing/TIG welding method has any effect on the ductility of the weld.
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Bob Don't believe everything you think. |
#13
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The machine should be set on AC...not DC
Ben |
#14
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Quote:
Flux chemistry would not indicate such an occurrence.
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Kent http://www.tinmantech.com "All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919. |
#15
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I don't understand why an oxy acetylene weld is more ductile than a tig weld. (?)
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Bob Don't believe everything you think. |
#16
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Quote:
vs HAZ-- ... and, the filler many TIGboys often choose is that hard, brittle, non-anodizing 4043.
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Kent http://www.tinmantech.com "All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919. |
#17
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Ok, thanks Kent.
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Bob Don't believe everything you think. |
#18
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Hi Kent, these leaks with TIG welding aluminum, is this more relevant to the TIG welding process( eg weld density) or to poor penetration?
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Richard |
#19
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Quote:
It's a problem that the most expensive tig machines are only just now starting to overcome.
__________________
Kent http://www.tinmantech.com "All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919. |
#20
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I would agree with Kent about the density.
When I build an aluminum vessel using TIG, be it for fuel or water, I always double weld. I will first make a proper pass using thin wire and then go back and puddle the weld quickly. It sounds like a lot of work but it happens quickly. The puddle pass is lower current. I find that despite the amount of prep and what appears to be a beautiful weld, there is always a bit of porosity that comes to the surface here and there on the puddle pass. I leak test the tank before the second pass. It is very rare that there is a problem but if there is porosity at all, I figure it can potentially become a leak. I am funny about having to repair a leak later when there has been fluid (especially fuel) in the tank. Repairing a contaminated spot is never a good idea. Seldom do I have porosity when welding with 1100 wire on 1100 or 3003 sheet metal. 1100 was not the correct wire for the alloy of the tanks I have built so I was using the harder wire as Kent has mentioned (4043 or 5356). I do not know if it would yield a better result if it were done in a chamber or back purged as I have never tried that. Generally my penetration is not an issue although admittedly I often back weld as a precaution on new panels. I am looking into a new inverter welder from Miller as my machine is an old Syncrowave. I will be taking one for a test drive at the local distributor with the aid of a welding rep. The claims regarding penetration and HAZ are miraculous. Perhaps the back fluxing is the easier and less expensive route. I have been meaning to try TIG welding with a flux backing. I have Allstate flux that is getting old so it may not be a fair trial. I need to order some of the TM flux. Never seems to be enough time to do all that I would like. Rick
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Rick |
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