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Magnesium repair

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shoot501

02-07-2003 08:04:54




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Is there a way to repair a magnesium [spelling?]case on a chainsaw. I have one with a 1/2" hole in the case and another with a support ear broken off.Thanks




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andy

02-13-2003 23:50:01




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 Re: magnesium repair in reply to shoot501, 02-07-2003 08:04:54  
The part should be taken off cleaned well with soap and water, glass bead blasted or sanded good, v bevel out the break or crack and GTA ( TIG ) welded from both sides it possible. It will not catch on fire and there is not anything magic about welding magnesium, just an old wives tale, but it but must be clean. If you can weld aluminum you can weld mag. Use AZ92 welding wire. A good test for mag--file off some of the material - touch with a kitchen match - mag dust will burn with a white light and aluminum will just roll over also magnesium is much lighter in weight than aluminum.

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Dusty

02-08-2003 05:18:36




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 Re: magnesium repair in reply to shoot501, 02-07-2003 08:04:54  
You might try some epoxy.



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Steve U.S. Alloys

02-07-2003 18:17:51




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 Re: magnesium repair in reply to shoot501, 02-07-2003 08:04:54  

You can make the repair with a low temp propane plumbers torch and an alloy like 328. The Mg won't get hot enough to ignite and the repair procedure doesn't require any exotic equipment or expertise. A simple technique yields very surprising results on Mg and Al. Potmetal can also be repaired but with some degree of difficulty as the melting point of the potmetal and filler metal is very close.

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shoot501

02-07-2003 19:11:02




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 Re: Re: magnesium repair in reply to Steve U.S. Alloys, 02-07-2003 18:17:51  
Thanks Steve for the very good info.



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ScottT

02-07-2003 17:21:26




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 Re: magnesium repair in reply to shoot501, 02-07-2003 08:04:54  
None of you had to disassemble the case? I have an old Castor (made in Italy), the studs that hold the bar on stripped out of the case, It's been sitting in the corner of the garage because I assumed I would have to disassemble it to prevent everything from getting to hot. I was going to have the holes welded closed and drill and retap. What do you think?

Scott



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Bus Driver

02-07-2003 16:11:15




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 Re: magnesium repair in reply to shoot501, 02-07-2003 08:04:54  
My Stihl was welded using TIG. Only found one fellow who would do it and he took 2 weeks to get to it. To test for magnesium, scrape with a knife to make a few small shavings about like filings. Put white vinegar on the shavings, if it fizzes, it is magnesium. Factories use a housing similar to sandblast cabinet filled with inert gas and weld magnesium in those. New part for Stihl was $110.00. Welding was $20.00 and was very successful. I think he turned up the shielding gas and prevented a fire that way- smothered the heated area.

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BillW

02-07-2003 12:29:02




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 Re: magnesium repair in reply to shoot501, 02-07-2003 08:04:54  
If not reparable why not go used? What saw do you have? I have a bunch of old HOMELITE parts.



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shoot501

02-07-2003 13:24:45




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 Re: Re: magnesium repair in reply to BillW, 02-07-2003 12:29:02  
The saw is a husky 257, the reason I have 2 broken cases is I bought a used one with a good case [ yeah rite ].



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Russ

02-07-2003 11:06:47




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 Re: magnesium repair in reply to shoot501, 02-07-2003 08:04:54  
I had one welded once, and the old guy recognized it as mag. at once. He said he could weld it but it was very touchy. If the mag. catches on fire you will loose the whole thing. I filled the gas tank full of oil so there woudn't be any fumes to explode and he did a wonderful job!



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shoot501

02-07-2003 13:28:08




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 Re: Re: magnesium repair in reply to Russ, 02-07-2003 11:06:47  
How did He weld the case, stick, mig, tig or brase and what rod, wire, flux, etc do you use. Thanks



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russ

02-08-2003 12:07:55




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 Re: Re: Re: magnesium repair in reply to shoot501, 02-07-2003 13:28:08  
I assume that he tig welded it with mag rod, but this was 25 years ago!



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