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Thread: TIG welding question

  1. 07-30-2011, 06:06 AM #1
    mifirewoodguy
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    TIG welding question

    Just wondering if you guys have had any luck TIG welding on your saw? I have a 357xp and a 359 xp both need some welding done on em. The 357xp needs the small tab on the flywheel side that the chain brake handle mounts to welded back on and the 359 xp need the opposite mounting hole where the chain brake mounting screw goes is wobbled out and the threads are gone, so welding the hole up will allow me to go back and drill and retap it. Any suggestions?
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  2. 07-30-2011, 08:08 AM #2
    nmurph
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    I have seen some work on saws in threads here. I am watching this thread. I have a 346 with a crank in the case under the FW. The crack doesn't extend into the CC, but I want it closed bf I go any further.
    346's 357's 359's 372's for sale- PM me if you are looking

    Quote Originally Posted by mweba View Post
    Ya sounds like a guessignosis to me
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  3. 07-30-2011, 08:15 AM #3
    shelbythedog
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    Don't know if you already had a source for the welding, but in the drag racing community around Detroit this is the guy to see for welding stuff most other guys can't handle. I have never had any work done by him personally, but his reputation is tremendous.

    Chris Razor Hi Tech Welding Phone # ? - Yellow Bullet Forums
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  4. 07-30-2011, 09:02 AM #4
    blsnelling
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    Quote Originally Posted by nmurph View Post
    I have a 346 with a crank in the case under the FW.
    I wouldn't worry about it. All my saws have cranks in them

    BTW, I've seen some beautiful welding on chainsaws. I have no idea how it's done, but it certainly can be.
    Brad - Snellerized Saws

    Have a 201T that doesn't run like you expected? Need a new one that's already modded and ready to go? PM me for details.
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  5. 07-30-2011, 09:15 AM #5
    xdmp22
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    Quote Originally Posted by nmurph View Post
    I have seen some work on saws in threads here. I am watching this thread. I have a 346 with a crank in the case under the FW. The crack doesn't extend into the CC, but I want it closed bf I go any further.
    You may already know this, but just in case and to share with others, make sure you drill a small hole on the ends of the cracks and then weld the crack and the holes back up. Cracks that are not drilled @ the end will re crack 95% of the time even after being welded.....
    Stihl MS310.....until CAD kicks in

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  6. 07-30-2011, 09:19 AM #6
    xdmp22
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    To the OP, I rent shop space inside a welding shop from some friends of mine, they are constantly TIG welding lawn mowers and trimmers and chainsaws....along with rims, and other crazy things.

    It works just fine when done right.

    Proper TIG welding is accomplished by making sure the aluminum is constantly clean with multiple wire brush strokes with stainless steel brushes.....its not uncommon to brush 3 or 4 times inbetween layers of welding. The idea is to keep the calcium layer off the top of the aluminum
    Stihl MS310.....until CAD kicks in

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  7. 07-30-2011, 09:44 AM #7
    nmurph
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    Quote Originally Posted by blsnelling View Post
    I wouldn't worry about it. All my saws have cranks in them

    BTW, I've seen some beautiful welding on chainsaws. I have no idea how it's done, but it certainly can be.
    Dang, now I understand why your saws run so well and that last rebuild of mine wouldn't run at all.


    Quote Originally Posted by xdmp22 View Post
    Proper TIG welding is accomplished by making sure the aluminum is constantly clean with multiple wire brush strokes with stainless steel brushes.....its not uncommon to brush 3 or 4 times inbetween layers of welding. The idea is to keep the calcium layer off the top of the aluminum
    We are talking about welding magnesium......a totally different animal than AL.
    346's 357's 359's 372's for sale- PM me if you are looking

    Quote Originally Posted by mweba View Post
    Ya sounds like a guessignosis to me
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  8. 07-30-2011, 11:24 AM #8
    Bob Wright
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    Quote Originally Posted by xdmp22 View Post

    It works just fine when done right.

    Proper TIG welding is accomplished by making sure the aluminum is constantly clean with multiple wire brush strokes with stainless steel brushes..
    The very first step is to see if the saw part is Magnesium or Aluminum, very important. A simple test is dab some liquid solder flux on the part. If it turns black its Magnesium and needs to be TIG welded if it stays clear its Aluminum and can be TIG or MIG welded. The rods/wire are different for both metals and one won't work on the other. Just my thoughts of doing them for 30+ years...Bob
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  9. 07-30-2011, 03:25 PM #9
    xdmp22
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    Well, don't I feel a little dumb......lol

    Yes, as pointed out, Aluminum and magnesium are differant animals.
    Stihl MS310.....until CAD kicks in

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  10. 07-30-2011, 04:38 PM #10
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    Magnesium also burns with this bright white light if you don't know what you are doing.

    Gets very interesting to put it out. My uncle lost a saw like that when I was a kid.
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  11. 07-30-2011, 06:20 PM #11
    nmurph
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    Quote Originally Posted by Bob Wright View Post
    The very first step is to see if the saw part is Magnesium or Aluminum, very important. A simple test is dab some liquid solder flux on the part. If it turns black its Magnesium and needs to be TIG welded if it stays clear its Aluminum and can be TIG or MIG welded. The rods/wire are different for both metals and one won't work on the other. Just my thoughts of doing them for 30+ years...Bob
    Bob,
    what rods are you using for Tiggin Mg?
    346's 357's 359's 372's for sale- PM me if you are looking

    Quote Originally Posted by mweba View Post
    Ya sounds like a guessignosis to me
    Experience is what you get when you didn't get what you wanted!

    It's as easy as bobbing for apple sauce!--Neal Boortz

    Weak people can never do the right thing! -- WatsonR
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  12. 07-30-2011, 09:02 PM #12
    SkippyKtm
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    Quote Originally Posted by nmurph View Post
    Bob,
    what rods are you using for Tiggin Mg?
    I 'taint Bob but these are the rods Bob helped me find awhile back:

    AZ92T60 magnesium tig welding rod

    I wish I could get them in a size smaller than 1/8" to match my electrode size but otherwise they're work fine. Don't bother trying to use aluminum tig filler rod because the weld will crack as it cools (ask me how I know).
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  13. 07-30-2011, 09:05 PM #13
    Roanoker494
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    Here is some good reading on the subject. BTW, there was a member here that started a thread where he had repaired a boss on a 372 crankcase.

    http://www.welding-technology-machin...ium-alloys.htm (This one is probably the best IMO, make sure you check out the links on the left side of the page)
    Welding Magnesium
    http://www.welding-advisers.com/Welding-magnesium.html
    Last edited by Roanoker494; 07-30-2011 at 09:13 PM.
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  14. 07-30-2011, 09:09 PM #14
    xdmp22
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    Quote Originally Posted by SkippyKtm View Post
    I 'taint Bob but these are the rods Bob helped me find awhile back:

    AZ92T60 magnesium tig welding rod

    I wish I could get them in a size smaller than 1/8" to match my electrode size but otherwise they're work fine. Don't bother trying to use aluminum tig filler rod because the weld will crack as it cools (ask me how I know).
    that is harris welco stuff

    here are links to the page, they are available in 1/16" and 3/32"

    The Harris Products Group - Magnesium 292

    and here is the same stuff only with less aluminum and zinc

    The Harris Products Group - Magnesium 261

    the 292 is what we sell the most of to the welders here in omaha ne
    Stihl MS310.....until CAD kicks in

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  15. 07-30-2011, 09:13 PM #15
    SkippyKtm
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    Quote Originally Posted by Roanoker494 View Post
    Here is some good reading on the subject. BTW, there was a member here that started a thread where he had repaired a boss on a 372 crankcase.

    Welding Magnesium
    Welding-magnesium, for light and strong permanent connections
    Do you mean the thread I started a month or two back?:
    http://www.arboristsite.com/chainsaw/173495.htm

    I'm kinda embarrassed by it now . I've improved somewhat since then, practice makes perfect I suppose!
    Last edited by SkippyKtm; 07-30-2011 at 09:17 PM.
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