#11
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If I had to make a guess I am with Carey, oxidizing flame.
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Richard |
#12
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Anodized sheet or maybe 2024?
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#13
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It is not ---
Okay - all I was given with this problem was:
Aluminum gas weld looks like this - why? Okay - so what I can see from these two images: Not the filler (4043, brazing filler, HTS whatever, lumi-alloy, dura-fix etc etc) Not the flux (wrong flux, brazing flux, dirty flux etc etc.) Not the alloy (2119, 2024, 5086, 7075 etc etc.) Not the water (iron deposits, distilled, radiator water, swamp water etc etc.) Hint: There is inconsistency in the weld - top and bottom/root, but the weld never gets "good" - just nasty/funky to "almost acceptable ..... at its best point."
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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. |
#14
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Tip was to small?
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Jeff Dyce Hell, there are no rules here - we're trying to accomplish something. Thomas A. Edison |
#15
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Quote:
Seriously, when mechanical things vary inconsistently in use, it often means something is loose and moving around when it shouldn't be and blocking free movement of something else like trash in a carb or a loose wire/bad connection. So that might suggest regulator issues varying pressure, connection issues or maybe hoses deteriorating on the inside. No idea what's in a flashback arrestor but they are made to interfere with flow in specific situations so if they were malfunctioning, that could also cause issues.
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AC Button II http://CarolinaSculptureStudio.com https://www.youtube.com/channel/UCzSYaYdis55gE-vqifzjA6A Carolina Sculpture Studio Channel |
#16
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Welding in the wind?
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#17
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Problem with the regulator?
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Bob Foster |
#18
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Hi Kent, Looks like some deep scratches might indicate an attempt to clean the sample with abrasives rather than chemicals or stainless brush. If aluminum oxide paper was used some of the grit might have been embedded or left on the surface. If so the aluminum oxide might have been too much for the cleaning action of the flux to handle.
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Johnny C. |
#19
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I have not gas welded much Alum. but here goes.......
The filler is not flowing out into the base metal. which would tell me not enough heat. the surface of the bead looks oxidized, like it solidified out of the flame envelope. So My conclusion is that the torch was at the wrong angle or lifted after each rod dip allowing O2 on the molten alum. Steve
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Steve Hamilton Hamilton Classics Auto Restoration & Metalshaping |
#20
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the answer
The problem was loose fittings.
Which gave erratic results on top and root sides. But a more distinct lack of flow occurred on the top. This scenario also included two fittings that could not be adequately tightened and still leaked. When the O/F has an inconsistent flow, the weld bead is affected both top and bottom, but the variations will be different on the top than they are on the bottom/root side. This was a classic case. Thank you, everyone, for your analyses. It was a fun bit of Holmsian scrutiny, wasn't it?
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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. |
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