Welding an inside fillet weld after doing a outside corner weld on 3/16 aluminum flat. Seems I do the inside fillet and the nice outside bead gets hot enough to become concave? Back off on amps I presume on the second weld? Let piece completely cool before attempting welding on opposite side? I am experimenting and would like to think I could do both sides without damaging one of them. I had piece on a heavy steel milling set up block as a heat sink.
When heat soaked you need a lot less current to weld the second string even on a thick piece. The melting temp is far lower than steel but heat conductivity much higher so you need a lot more juice to get started.
Pictures from my scrap collection:
http://forum.weldingtipsandtricks.com/v ... f=9&t=5677
http://forum.weldingtipsandtricks.com/v ... f=9&t=5677
exnailpounder
- exnailpounder
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Weldmonger
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Joined:Thu Dec 25, 2014 9:25 am
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Location:near Chicago
If your piece gets hot, it will take less amps to weld it. Thick steel isn't a great heat sink. I will draw out heat but very slowly so thats why your AL stayed so hot. If your not in a hurry then let it cool off between welds or quench it. Are you using filler on your OS corner weld or fusing?
Ifyoucantellmewhatthissaysiwillbuyyouabeer.
Using filler moving along quickly. Last two times I did this while practicing I believe I did outside first then inside. So probably should let cool, or do outside last backing down on amps, maybe no filler I guess. Just need to practice more on scrap pieces. Learning more every day. Today's lesson did vertical up on 1/4 inch aluminum went pretty good.exnailpounder wrote:If your piece gets hot, it will take less amps to weld it. Thick steel isn't a great heat sink. I will draw out heat but very slowly so thats why your AL stayed so hot. If your not in a hurry then let it cool off between welds or quench it. Are you using filler on your OS corner weld or fusing?
- 5th Street Fab
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Guide
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Joined:Sun Jan 15, 2017 1:08 am
We usually try to do the inside first, then we cut out the burn through and weld the outside. It's nicer looking in the end.
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Okay will try inside first. And probably let cool then outside kind of a fast pass. Figure the inside fillet can tolerate the heat a bit better than the outside.5th Street Fab wrote:We usually try to do the inside first, then we cut out the burn through and weld the outside. It's nicer looking in the end.
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