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WELDING QUESTION?

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ALLEN B

11-13-2000 11:33:36




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I HAVE A STIL CHAINSAW WHICH HAS BROKEN EARS ON THE CASTING OF THE RECOIL START WHERE IT BOLTS DOWN, IS THERE ANYWAY THIS CAN BE WELDED OR FIXED SOMEHOW?




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Bus Driver

11-26-2000 12:42:36




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 Re: WELDING QUESTION? in reply to ALLEN B, 11-13-2000 11:33:36  
Based on my broken parts with the Stihl saws, I think Steve with US Alloys is correct. Mine was welded by a pro, but it took him three weeks to find time to do it. To test lightweight (not zinc) metals for magnesium, put a few filings on glass or plastic and put a drop of vinegar on the filings. If it "fizzes", it is magnesium. To compare to aluminum, do the same test with a known aluminum sample and it will not "fizz".

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Steve U.S. Alloys

11-15-2000 06:49:42




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 Re: WELDING QUESTION? in reply to ALLEN B, 11-13-2000 11:33:36  
Hi Allen,
The part you want to repair is magnesium. Aluminum filler materials will not work. In addition, if you over heat the material, it will catch fire and burn very brightly and very hot and will continue to burn until nothing is left as magnesium will produce it's own oxygen. I have a very simple and fool proof method for you and will walk you through the procedure.
Steve



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Bill

11-19-2000 08:47:09




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 Re: Re: WELDING QUESTION? in reply to Steve U.S. Alloys, 11-15-2000 06:49:42  
Steve; Could you share your process with the rest of us?
Thanks..
Bill



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T_Bone

11-14-2000 21:50:27




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 Re: WELDING QUESTION? in reply to ALLEN B, 11-13-2000 11:33:36  
Hi Allen, Yes it can be and very easy. Two choices for welding, Tig or Brazing as Mig and Arc welding would be too cold for such a small area.

Clean, reclean and clean is the key to alunimum welding with a "new" SS wire brush on a drill motor after you take a propane or oct/act heat to burn off the oils. How to tell when it's clean is alunimum will turn black oxide on the surface when it's not clean and really white if it is clean.

I use regular alunimum filler rod for arc welding because it contains the flux needed. Any welding supply shop carrys the correct rod. Alunimum is a tad hard to see the weld puddle but with brazing it much easyier cause you only have to get it hot enough for flow to occur thus a good joint will result. Tig will also be great but greater skill is rerquired to tell when it's hot enough to weld.

A little practice will help on a scrap piece for either method. If Tig is used I would still apply a small amount of preheat with a torch as it would be faster than without it but not required.

Have fun!!!

T_Bone

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robert hudson

11-14-2000 09:45:27




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 Re: WELDING QUESTION? in reply to ALLEN B, 11-13-2000 11:33:36  
May not be Alum. but magnesium. If welded with alum. rod, it'll look ok but will not be compatable.(will break). Too find which it is. file some particles onto a corner of a sheet of paper. Hold a flame under the corner till it burns, if the metal fillings spark and burn, its Magnesium. In either case it can be tig welded with the proper filler rod. Clean with brake cleaner (the mixture oil soaks into the casting pores and contaminates the weld.

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Bill

11-14-2000 03:39:26




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 Re: WELDING QUESTION? in reply to ALLEN B, 11-13-2000 11:33:36  
They sell a rod that you can use with a propane torch that will repair aluminum and pot metal. Runs around $10.00 for a pack. I've used it with good results on some projects, poor on others. I wouldn't blame the rod at this point, just that I'm not really good at welding or braizing. You can get the rod at Quality Farm and Fleet, Northern Tools (online) has it and some parts stores carry it. Good luck.

Bill

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Steve from Tn

11-14-2000 04:39:48




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 Re: Re: WELDING QUESTION? in reply to Bill, 11-14-2000 03:39:26  
Would brazing work here?



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Jim K

11-13-2000 16:36:03




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 Re: WELDING QUESTION? in reply to ALLEN B, 11-13-2000 11:33:36  
Allen I think if your pretty good with welding aluminum you could probably do it. I had to replace the one on my STIHL 028 (dropped it out of a tree) only 35 bucks.
Jim K



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