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The starter bracket off of my 40hp Yamaha outboard snapped off. I _think_ it is aluminum. I have a oxy/fuel torch, AC buzz box, and a 175 mig welder. What process do I use to fix this? I _think_ aluminum electrodes require DC current. Will I have to take the starter apart to weld it?Thanks in a advance!Chris
Reply:Chris, you will want to tig weld this one. A starter has a LOT of stress on it when you crank a motor over. The part is cast aluminum. Zap has posted several threads with good pics of cast aluminum repairs, as well as a few other welders having done some good posts on it. I feel if you try to mig it, you will have nothing but problems on a small part like that. I would try it with a mig if it were bigger, and had more suface to deal with; but mig will start cold, and I think it would move the part around too much, as well as just not work quite as well. Good luck!!And then, after so much work...... you have it in your hand, and you look over to your side...... and the runner has run off. Leaving you holding the prize, wondering when the runner will return.
Reply:Originally Posted by RojodiabloChris, you will want to tig weld this one. A starter has a LOT of stress on it when you crank a motor over. The part is cast aluminum. Zap has posted several threads with good pics of cast aluminum repairs, as well as a few other welders having done some good posts on it. I feel if you try to mig it, you will have nothing but problems on a small part like that. I would try it with a mig if it were bigger, and had more suface to deal with; but mig will start cold, and I think it would move the part around too much, as well as just not work quite as well. Good luck!!
Reply:Braze it. Harris sells a produce called Al-braze. With the tool you have this would be an option. It flows like water when the metal is the proper temp. They also, sell a filler with flux inside the filler, I have never used it.I would take it apart, the entire part need to be preheated if you braze it. It takes a lot heat.The alumiweld type product would work. I have played with them, just haven't used them on anything meaningful. Still takes a lot of heat.Last edited by tapwelder; 05-19-2008 at 09:10 AM.
Reply:Originally Posted by tapwelderBraze it. Harris sells a produce called Al-braze. With the tool you have this would be an option. It flows like water when the metal is the proper temp. They also, sell a filler with flux inside the filler, I have never used it.I would take it apart, the entire part need to be preheated if you braze it. It takes a lot heat.The alumiweld type product would work. I have played with them, just haven't used them on anything meaningful. Still takes a lot of heat.
Reply:Number 4 tip will be fine, dont want to use the rosebud, just need to get it hot enough for the aluminum filler stuff to flow. More like soldering than brazing, since the stuff they sold you undoubtedly has a lot of tin in it. With a rosebud, and such a small piece, you could overheat it pretty fast. Remember that aluminum doesn't change colors as it heats up with a flame on it, you can get to the melting point pretty quick if you're not careful.I r 2 a perfessional
Reply:Suggestion for re-installing after the repair is completed:Find out why there was such strain on this. Carefully clean up all mating surfaces and check alignments. There is a reason this broke, it isn't just fate. That break appears to be from either alignment or vibration and a loose fastener. A speck of grit on a mating surface at time of assembly can lead to a break like that also.As usual, especially when mounting cast anythingassemblies, tighten all mounting bolts evenly, alternating from one to the next a little at a time. Don't cinch one up tight then do the other(s). Use a torque wrench if at all possible. Most reports analyzing bolt failures I have read found that without a torque wrench most people overtighten small sizes and undertighten large sizes. Where one defines the line between large and small is different, but it seems to be around 9/16 (14mm).Good luck!-MondoMember, AWSLincoln ProMIG 140Lincoln AC TombstoneCraftsman Lathe 12 x 24 c1935Atlas MFC Horizontal MillCraftsman Commercial Lathe 12 x 36 c1970- - - I'll just keep on keepin' on.
Reply:Good tip's Mondo...BobBob WrightSalem, Ohio Birthplace of the Silver & Deming Drillhttp://groups.yahoo.com/group/southbend10k/http://groups.yahoo.com/group/sawking/1999 Miller MM185 w/ Miller 185 Spoolmate spoolgun
Reply:TAKE IT APART BEFORE WELD ANYTHING ! or your starter will not start anything when finished.Me! |
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发表于 2021-8-31 23:58:35