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Thread: "Battlebot" Repair (TIG weld 4130 Cr-Mo steel)

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  1. #1
    Join Date
    Dec 2009
    Greater Seattle, WA

    Default "Battlebot" Repair (TIG weld Cr-Mo steel)

    Here is another job I did at the Northwest Model Hobby Expo

    At the expo they had a raised, enclosed steel and bulletproof plexiglass "arena" where robots would "battle" one another with things like large rotating lawnmower blades spinning at very high RPM. I can't imagine how dangerous it would be to be near one of those robots without the steel and bulletproof plexiglass between you and it!

    Anyhow, I got to repair a damaged "spinner" type battle bot for a competitor, so he could get back in the competition. Time was very limited, I recall I did the repair in 8 minutes start to finish.

    The big gash in the robot body was caused apparently by another "spinner" robot blade slicing into it. The material of this robot was heat treated Chrome-moly steel. Something like 4140 or 4340 I think. I used TIG with 70S6 steel filler rod for the repair. This robot was in the 14 pound weight class, and it was a "spinner" type as well. (the robot body spins at a very high speed with blade extended around the outside.) The heat treating gave it a neat dark color all over it. I had to weld with little heat input to avoid damaging the sensitive electronics mounted on the opposite side of the metal. Apologies for blurry pics, that's what can happen when in a hurry I guess.

    There is a *lot* of effort that goes into designing and making these custom robots, so I was kind of honored to get to weld on one.

    PS - A little battlebot trivia: I heard the two Mythbusters guys met each other by doing battlebots.
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    Last edited by jakeru; 03-07-2011 at 06:19 AM.
    '13 Everlast 255EXT
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  2. #2


    Is that the guy's wallet in your hand?

    Just kidding. To me there is always something super gratifying about being in the right place at the right time to help somebody out with a repair. Good work dude.
    Everlast PP256
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  3. #3


    looks good man!
    300whp FWD 94 Celica
    PowerPro 205 with a hack behind the mask!

  4. #4


    I remember watching battle bots on TV and I even had a game on the computer when I was younger. I always wanted to build one too. I guess fixing one is close to that I did not know that people were still making these and doing battles.
    Everlast 255EXT - Perfection
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  5. #5
    Join Date
    Dec 2009
    Greater Seattle, WA


    I found a video on the northwest model hobby expo web site that has a little blurb about the battlebots. Fast forward to 3:09 to see it.
    There is also a short clip of me striking an arc at 0:46
    Last edited by jakeru; 03-07-2011 at 10:00 PM.
    '13 Everlast 255EXT
    '07 Everlast Super200P

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