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Old 05-14-2020, 11:17 PM
steve.murphy steve.murphy is offline
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Default Gas Welding Aluminum Flux

When gas welding aluminum for something like a lap joint or welding a something like a fuel tap fitting onto a fuel tank that has an overlap onto that does not get 100% welded, is residual flux a concern for corrosion? I can't see how you could clean all the leftover flux out of the joint.
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Old 05-15-2020, 06:38 AM
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Mark Fox Mark Fox is offline
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You could try boiling hot water from the kettle. That’s what I use when I Silver solder stainless steel.
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Old 05-15-2020, 08:59 AM
billfunk29 billfunk29 is offline
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Default steam cleaning

THese cheap steam generators work well,,... if you can get to the joint.



https://www.walmart.com/ip/Bissell-3...SellerId=17664
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Old 05-15-2020, 11:12 AM
crystallographic crystallographic is offline
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I've found trapped flux on weld seam backsides that were 85 years old - only got to see them after cutting the body off the frame.

For my efforts, I use a slosh of boiling water followed by a spray of 25% phosphoric acid. Seems to work well for AGW flux, after inspecting.
Some fluxes set up as a "glass" and are more difficult to remove, like the silver braze flux I use or a brass brazing flux, and steam is better in those cases because steam is hotter than boiling water.
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Old 05-15-2020, 04:50 PM
steve.murphy steve.murphy is offline
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Thanks for that guys . I always wondered about that Kent. Cheers
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