#1
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Bubbles in 5052
Making butt welds for a motorcycle tank. Material is 5052 0.060 inch thick. 3/32 2% lanthanated, 80 balance, 80 herts, 80 amps max, #6 cup, gas lens, 12 cfhr argon. Cleaned by sanding the cut edge, the grinding marks are from knocking down the initial pass with abrasives. Made initial pass with 5356 1/16 filler rod. Then a pass from the inside with no filler, then another pass from the outside without filler.
What's with the bubbles? I can live with them if they are only cosmetic but gotta get rid of them if they are going to make leaks or cause structural failure. I did a liner on the last tank and don't want to do that again for a variety of reasons. I can still grind most of it out from inside and out if necessary. IMG_1590.jpg
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Jeff |
#2
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Hi,
The issue is contamination. It appears in your photo, that the weld to the right looks fine and the bubble form half way along the photo. To me, it looks like brown/tan soot on both side of the weld, from not cleaning the aluminum before the weld. A contaminated tungsten, oxidation on the welding rod, or the aluminum itself can cause this. To get the bubble out of the weld, you will have to grind most of the old weld away and try again. The bubbles will cause a leaking weld line. Bill
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Bill Tromblay "A sign of a good machinist, is one who can fix his F$@& Ups" My mentor and friend, Gil Zietz Micro Metric Machine. |
#3
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Ran a burr to lift out the porous area and re-welded. Looks good now in the areas I did that. Thanks.
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Jeff |
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