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Greasy Member
Join Date: Mar 2006
Location: Indiana
Posts: 1,457
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Help... Tig welding magnesium
Hey all, have tig welded quite a bit in the past, but have come upon a situation that requires me to weld a cast magnesium housing...
Any suggestions? I know enough now, that I have to track down some magnesium filler rod. Anybody had a piece of cast magnesium burn up while welding (would rather not have that happen). Is an oven required to heat the entire piece before welding? Also, should I use a particular setting for penetration or pulse frequency? TIA, Nick
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Owner: Bennington Motorsports www.benms.com Sponsor for Midwest Region 944-SPEC racing series -When was your timing belt changed or tensioned?? -Yes, I'm the crazy man that will loan out my 9201. Just PM me, I will add you to the list and get it out ASAP. |
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01-18-2007, 04:56 PM
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Banned
Join Date: Mar 2005
Location: Travelers Rest, South Carolina
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Re: Help... Tig welding magnesium
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01-18-2007, 05:17 PM
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the key to it is to keep the tungsten as close or submerged in the weld pool this will prevent cracking. Use the better mag rod.. don;t have the number in front of me but its something like 150 bucks for a 5 lb box.. it will not start on fire unless you get it really hot.. Just be careful the zinc gases are not to frinedly to us humans.. .. I really don't know how much experience you have with tig welding but this should not be taken lightly
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01-21-2007, 06:34 PM
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Location: Boston
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If your good at welding aluminum, Magnesium should give you no problems. From a welding aspect, the two act/react very similar.
Straight Argon is the preferred gas. Crank your postflow up as much as possible. If you can, weld in an argon environment, since magnesium burns in air. AC and High freq on the welder. If your dealing with a casting, the base metal is likely one of AZ63A, AZ92A, AZ91C or AM100. If so, the filler you need is AZ92A. Be careful how you dispose of any filings or small scraps of material (if your doing any cutting or grinding) Vin |
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01-22-2007, 05:01 AM
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Greasy Member
Join Date: Mar 2006
Location: Indiana
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That is just the info I was looking for!
Granted, I was a little worried about the burning aspect as this is a 1970's hewland LG500 casting! Try finding one of those at a reasonable price anymore  I have tracked down the AZ92A filler, so I think I will be cranking up the lincoln this weekend. Thanks guys! Nick
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Owner: Bennington Motorsports www.benms.com Sponsor for Midwest Region 944-SPEC racing series -When was your timing belt changed or tensioned?? -Yes, I'm the crazy man that will loan out my 9201. Just PM me, I will add you to the list and get it out ASAP. |
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01-22-2007, 04:28 PM
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Join Date: May 2005
Location: Cridersville, OH
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Nick, PLEASE have a bucket or two of sand nearby. I've welded several pieces of mag and never had it flame up, but had a good friend lose everything from a mag fire. Also it really likes preheat, I just use a rosebud and make sure to not hit the edges. That's where it likes to catch fire. If it's an old rearend housing or trans. use plenty of mineral spirits or brake clean. And as stated before it's best to do it outside for ventilation.
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01-22-2007, 05:32 PM
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