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  1. #1
    Join Date
    Feb 2008
    Posts
    835

    Default Welding Die-Cast Zinc Alloys?

    I've been lurking here for a while and just signed up to throw my 2 cents in recently. So now that I'm here (and to head off any ideas that I don't learn something new every day), I have a question for some of the more experienced welders.

    I'm sure that almost all of us have encountered broken die-castings. Not unusual since some have a ductile-brittle transition temperature not far below room temp. Has anyone got any tips/tricks for welding die-castings of high zinc content alloys like Zamac (ZAMAK)? I tried once some time ago... TIG welding/argon/various tungstens/polarities/etc and all I got was a crappy weld because it would pop and spit out metal before I could even develop a real puddle.

    I assume it was the zinc vaporizing before the other stuff (Al/Mg/Cu) was even halfway to their melting point. Being unable to weld inside of an atmosphere of 20 tons per square inch to keep the zinc from volatizing, I gave up. But I revisited this question last week when someone brought a GM tilt steering column to me that cracked when the 4 bolts deep inside backed out and let the wheel thump back and forth.

    I know this stuff used to get soldered with a special Cadmium alloy solder (EXTREMELY dangerous/toxic) but that's out of the question. Anyone recommend different gas, particular tungsten, AC squarewave, AC sinusoidal, particular balance, glovebox atmospere?

  2. #2
    Join Date
    Nov 2007
    Location
    Jackson, MI
    Posts
    57

    Default

    I've always been told it can't be done.

  3. #3
    Join Date
    Sep 2005
    Location
    Salem ,Ohio
    Posts
    3,893

    Cool

    http://www.crownalloys.com makes a torch repair rod for zinc aka potmetal. I have some and its Royal Kirkrod and it works pretty good. You see those guys at the flea markets/swap meets repairing junk and selling their brand of rod and they do a good job of fixing non critical parts. Royal Kirkrod 18" & 36" For Torch or Tig to Repair Zinc Based Metals..Bob
    Last edited by aametalmaster; 02-28-2008 at 05:45 PM.
    Bob Wright, Grandson of Tee Nee Boat Trailer Founder
    Metal Master Fab Salem, Oh 44460
    Birthplace of the Silver & Deming Drill
    1999 MM185 w/185 Spoolgun,1986 Thunderbolt AC/DC
    Spool Gun conversion. How To Do It. Below.
    http://www.millerwelds.com/resources...php?albumid=48

  4. #4
    Join Date
    Dec 2005
    Location
    wisconsin
    Posts
    836

    Default Die Cast Welding

    It was commonly done years ago. I myself have welded up a few of the older carb castings.I have a page scanned from one of my old welding books, but I cant get the file size small enough to post. If anyone wants it PM me with your address. In short you can use the aladdin filler rods with a OA torch, about a 3x carburizing flame and working the oxides out as you go. It can also be soldered usually with aluminum solders such as the ones sold by Brazing Technologies Group.

    -Aaron
    "Better Metalworking Through Research"

    Miller Dynasty 300DX
    Miller Dynasty 200DX
    Miller Spectrum 375 extreme
    Miller Millermatic Passport

    Miller Spot Welder
    Motor-Guard stud welder

    Smith, Meco, Oxweld , Cronatron, Harris, Victor, National, Prest-o-weld, Prest-o-lite, Marquette, Century Aircraft, Craftsman, Goss, Uniweld, Purox, Linde, Eutectic, and Dillon welding torches from 1909 to Present. (58 total)

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