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  1. #1

    Default Auto Frame Steel Type

    Question I need answered is: What kind of steel to they make car frames out of?



    Back Story:
    ============================
    I'm pretty new to welding and a guy at work asked me if I'd fix a small crack in his car frame. Claimed the auto repair shop wouldn't do it citing liability. I haven't seen the crack yet but his description goes like this:

    Backed into something with his bike carry attached and the force carried through the carry and the class II receiver enough that it snapped one of the bolts that hold the hitch to the frame and craked the frame around the hole.

    As described it doesn't sound bad but I've been around long enough that that might also mean he should not say anything to a dealer and trade this car in for a new one. :-)

    If it IS just a small crack out of the bolt hole I don't think it's a big deal to drill the end of the crack and then weld back to the hole. Maybe even weld on a small patch.

    Any experienced thoughts out there?

  2. #2
    Join Date
    Oct 2012
    Posts
    6

    Default

    Its a unibody car and this is a small frame section thats part of the unibody right? If so its already welded together so you can weld on it some more.

  3. #3
    Join Date
    Dec 2007
    Location
    Los Angeles
    Posts
    2,855

    Default

    Dealer gives a rats arse about the crack at trade in time- if he is trading it in I wouldn't bother touching the car.


    can't help on the welding part
    Last edited by Broccoli1; 10-09-2012 at 03:32 PM.
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  4. #4

    Default

    Since your new to welding and the job is probably going to require overhead welding while lying under a car trying to fuse Chinese steel of questionable alloy made from recycled Blatz cans and Skoal lids, I would probably advise against it.

    Hammer it flat, throw a washer on the hole and crank a new bolt down good and tight.

  5. #5
    Join Date
    Dec 2008
    Location
    Arizona
    Posts
    812

    Default

    If a body repair shop wouldn't touch it, you probably shouldn't either........
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  6. #6
    Join Date
    Sep 2005
    Location
    16919 Pole Rd. Brethren, MI 49619
    Posts
    4,383

    Default

    If a body repair shop wouldn't touch it, you probably shouldn't either........
    Why not, you figure all body shops want this work, or are even capable of welding anyway. If there is a good fix for it why not. Most of these do not need to be drilled. weld over it with a wire feeder nice and toasty, drilling can help burn thru on starts, penetration, or if its thick grind a little. I will agree, could be difficult, location, position etc.

  7. #7
    Join Date
    Sep 2005
    Location
    16919 Pole Rd. Brethren, MI 49619
    Posts
    4,383

    Default

    Claimed the auto repair shop wouldn't do it citing liability.
    Yes, you couldnt expect a repair place to actually fix anything??? hahaha. Dont you wish they would just fess up, we dont know how to do it, or, its not our kind of job.

  8. #8
    Join Date
    Nov 2006
    Location
    Lake of the Ozarks MO
    Posts
    3,556

    Default

    Probably not their thing, as SBerry said.
    I send people packing quite regularly, but they generally know the real reason.

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  9. #9
    Join Date
    Oct 2012
    Location
    Sunny Florida
    Posts
    3

    Default

    don't know if you took the job or not but I have welded on few frames in my time with no ill effects, 7018 or mig, get the paint and dirt off might need to grind a little "v" depending on size and thickness of frame ( sounds like a small crack) but like sberry said over head and or location could be prob.Keep ears covered from the little hot balls a fire good luck
    Last edited by CK2; 10-09-2012 at 04:19 PM.

  10. #10
    Join Date
    Oct 2012
    Location
    Sunny Florida
    Posts
    3

    Default

    remember you have fuel line, wires, brake line, ect... that run along inside of frame!
    Last edited by CK2; 10-09-2012 at 07:17 PM.

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