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Does welding a frame crack STRENGTHEN the frame?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by BigTex, Jul 19, 2001.

  1. BigTex

    BigTex 1/2 ton status

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    Guys, my frame had a crack around the steering gear. I welded 2 plates on either side of the crack. The weld is a pretty solid weld. Does this actually strengthen the frame, or does it just temporarily repair it until it actually breaks?

    <a target="_blank" href=http://www.chriswhitley.com>www.chriswhitley.com</a>
     
  2. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    I can only add that I have always heard that it is bad to weld at all on your frame. The weld only weakens the material in the frame where you welded. If you notice, all parts attached to the frame by GM are attached with bolts or rivits...

    Just my .02

    Does anyone else smell BFGs burning???
    454/TH400/NP205 - 14BFF/D60/w/ 4.10s
    <a target="_blank" href=http://24.10.209.54/bigolk5.htm>http://24.10.209.54/bigolk5.htm</a> [​IMG]
     
  3. BigTex

    BigTex 1/2 ton status

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    Well then what is the proper way to repair the frame when it has cracks? I am also going to add the brace in the near future.

    <a target="_blank" href=http://www.chriswhitley.com>www.chriswhitley.com</a>
     
  4. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    Check out this link http://www.offroaddesign.com/catalog/steeringkit.htm. Hope that helps you out!

    Does anyone else smell BFGs burning???
    454/TH400/NP205 - 14BFF/D60/w/ 4.10s
    <a target="_blank" href=http://24.10.209.54/bigolk5.htm>http://24.10.209.54/bigolk5.htm</a> [​IMG]
     
  5. MaxCrack

    MaxCrack 1/2 ton status

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    Well, it's stronger after the weld than with the crack. heheh.



    That's because I'm the devil.
     
  6. shaneopie

    shaneopie 1/2 ton status

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    I put the weld in kit on my 1985 blazer after the frame cracked and then i went out and beat the crap out of my blazer and i did not have anymore problems with the frame area after i put that kit in.
     
  7. BigTex

    BigTex 1/2 ton status

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    Cool. Thanks, guys. I just wanted to hear you guys' experiences on welding the frames in that area. I know alot of you have.

    <a target="_blank" href=http://www.chriswhitley.com>www.chriswhitley.com</a>
     
  8. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Welding a crack on a frame does not make it weaker. The weld itself is actually stronger than the steel the frame is made of. What welding will do is create stress around the welded area due to expansion and contraction from the heat of the weld.

    My own personal opinion on why GM used rivets instead of welding frame parts is that A) it was probably cheaper and easier to rivet tooling wise. B) Future crossmember changes also would require less tooling changes...

    As for the frame being heat treated I think thats a load of crap. Mostly there is no good reason to do it...none of GM's light duty trucks were ever designed to carry a load heavy enough to warrant the extra expense. If anyone has some source to prove the frames were heat treated I'd like to see it.

    Good welding procedures should always be observed but other than that I see no problem welding on the frame.

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
     
  9. michaelm

    michaelm 1/2 ton status

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    i agree with the heat treated is BS.
    gm's 'high strength' steel is anything BUT high strength.
    you guys with K5s must be aware of the rear shock mounts tearing out as well as all the nasty crack areas.
    i have a 2wdr 1 ton frame that we shortened and converted to 4wdr because i was tired of repairing the 1/2 ton frame.
    i would stitch weld every cross member that is riveted as you will be amazed how much better the truck will handle.
    start looking at your engine crossmember under the fuel pump area as well as i have yet to see one that wasnt broken
     
  10. mudddog91

    mudddog91 1/2 ton status

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    Man i thought i was the only one that would stitch weld all of my crossmembers!!!!!!!!I like the stiffness it added!Only reason I did it was because the rivets would loosen and the hole they were in would wallow out.
     
  11. FRIZZLEFRY

    FRIZZLEFRY 1/2 ton status

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    Did you stich all of them ?I was thinking of doing this to mine to get rid of some frame flex.

    "I AM THE HILIFT KING"<a target="_blank" href=http://community.webshots.com/user/beaterwhang>community.webshots.com/user/beaterwhang</a>
     
  12. michaelm

    michaelm 1/2 ton status

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    i was swapping the engine when i stitched the crossmembers from the firewall forward and did the steering box crack repair, as the engine was removed and welder was out i went to town. current frame has all rivets replaced with next size up bolts with stovers nuts
     
  13. tyler t.

    tyler t. 1/2 ton status

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    I agree that heating treating metal does not make it stronger it only adds strength to the metal if you add a filler (wire or stick electrode) which is of a higher tensile strength rating than the metal you are working with. Heat treating steel actually makes it more brittle when it cools. I have heard this before "it adds strength, but it makes the metal more brittle", how does one explain this? If you are a decent welder and can lay down a good solid bead you have nothing to worry about.

    J:(P it's what's for dinner!
     

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