#21
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Cheers Richard.
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Richard |
#22
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Cheers Richard.
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Richard |
#23
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4043 is a Silicon-bearing rod that has a low solidus (low re-solidifying temperature). 4043 was designed for welding castings. It is a hard, brittle filler that cracks when it is hammered / wheeled.
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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. |
#24
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Thanks Richard. Good luck and please post your results with the back-up flux.
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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. |
#25
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The fittings that I machine are 6061 so that is where I am using the 4043. Most tank are made from 5052 so I am using 5356 wire. Generally no hammering or crushing of the welds. On a few tanks that I made for D types, I used 3003 (butt welded) which did require some planishing and the wire I used was 1100 with great success. The bulk of the alloy tanks that I am making require edge welding of a flanged seam thus no planishing required. I am anxious to try fluxing. Kent- What do you suggest to thoroughly clean the flux form the inside of the tank (particularly the edge flange joints)? Flux is always my worry. I have seen far too many coachbuilt cars with flux corrosion that leaves me a bit nervous.
Rick
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Rick |
#26
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The pictures below are the ones I made with and without the flux( bottom weld is with and top weld without flux) IMG_20170626_084007.jpg IMG_20170626_084023.jpg I had difficulties to see the puddle that was fluxed because of the orange flair but then again it was probably too thick. Cheers Richard
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Richard |
#27
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It looks to me as though the flux is helping your welds. Sorry about the flare - it is a problem for electric welding that I have been working on.
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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. |
#28
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Flux has been an issue with welded aluminum cars since 1910, to a greater or lesser degree. Less flux into a weld means less flux to clean up. I have seen pre-war Alfa bodies with only slight residues left where they could not be cleaned on the back side - and only slight corrosion left, after 50 years. But, on the other hand .... I have seen serious backside corrosion from excessive flux ...... Maybe better to use a little less of the good flux rather than a lot of the avgerage flux? So, I flux only the rod when welding clean and fresh stock. And I rinse first with hot water, and then I rinse with 25% phosphoric - whatever available brand, MFR, Ospho, Dairyland rinse, etc. I don't try to rinse the phos. completely clean because it adds protection against corrosion. For joining 6061 to 5052 the 5356 is recommended by the AWS filler charts. 4043 is a second choice, or third. Many thousands of aviation fuel tanks were gas welded from 1920 onwards. Rinsing with hot water was S.O.P. in the factories.
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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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