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Reflooring dump bed

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  • Zig
    replied
    Thanks for the replies I can definitely see why it should be welded solid. I’ll be using 7018 and I was thinking about preheat to slow the cooling rate but looking at what Franz posted it says to avoid slow cooling rates

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  • ryanjones2150
    replied
    And one more link, Zig, I think you’ll find helpful:

    https://mcsmag.com/7-tips-welding-abrasion-resistant-plate/

    Leave a comment:


  • ryanjones2150
    replied
    Never mind, five second search reveals it’s a common grade for this application.

    Just one link to look at if you’re interested:

    https://www.heritagetruck.com/products/steel-dump-truck-bodies/

    How much you figure a dump box made out of
    Hastalloy X would cost? About half the total amount of rice in China?

    Leave a comment:


  • ryanjones2150
    replied
    All of that above is a direct cut and paste from commercial metals’ website:

    https://www.cmc.com/en/americas/our-businesses/performance-steel/cmcimpactmetals/abrasion-resistant-steel-plate/ar450

    Check it out for yourself.

    Anyone with a Lincoln “metals and how to weld them” book handy? Be interested in what that book says about this grade of steel.

    Any particular reason AR450 is spec’d out for this job?

    Leave a comment:


  • lars66
    replied
    All of what Franz said and better put spreaders in if doing a complete overlay of the floor.

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  • Franz©
    replied
    This is a Put it on paper job.
    Customer must be advised in writing that AR 450 is very likely to crack and fail in his aplication, and weld cracking is expected. Customer don't sign off, let somebody else weld it because when it fails the truck owner will be badmouthing you all over town.

    Drilling, Machining, Punching Impact AR450 plate is more challenging to drill, machine, and punch compared to as-rolled steels (grade 50-80K) due to higher hardness levels, but can be successfully accomplished with appropriate tools. Carbide tipped tools are recommended, but high speed steel tools can be used. Slightly lower speeds and higher pressures compared to as-rolled grades are recommended for proper chip formation. Bending Free bending should be performed utilizing maximum allowable bend radius to prevent cracking. Impact AR450 plates 0.313” (7.96 mm) thick and less can be bent using miniumum radius of 4T. Larger bend radius is recommended for thicker plates.

    Post-Delivery Heating Impact AR450 plate achieves its properties through quenching and tempering processes.

    Heating in fabrication (such as post-weld stress relieving) or in service must not exceed 400 Fahrenheit without risk of lowering the strength and hardness of the material.

    Welding Impact AR450 can be welded by conventional processes such as SMAW, SAW and GMAW provided that the weld procedures used are suitable for this grade and design of the welded structure.
    Proper weld procedures should include the following:
    1. Low Hydrogen conditions must be used.
    2. Excessive preheating (>350 F) should be avoided to prevent softening.
    3. Slow cooling rates should be avoided to prevent low toughness in the HAZ.

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  • Fusion Pro
    replied
    I've done a lot of those with dual shield esab wire...solid weld...pre heat...post peen...usually the prep is the only hard part....good answers so far

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  • ryanjones2150
    replied
    I would strongly consider dual shield. That will zip it up in no time.

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  • smawgmaw
    replied
    Weld it up solid!

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  • Noel
    replied
    Something low hydrogen, E7018 as an example would work. Preheating maybe if it's cold out and your worry is rapid cooling causing contraction cracking and brittleness, using GMAW solid wire for instance.
    As for welding all seams, yup, for the reasons mentioned. Give some thought to your welding sequence, stop starts and intersections.

    Leave a comment:


  • Ltbadd
    replied
    Try calling Associated Steel, they sell AR plate and can probably answer your questions.

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  • ryanjones2150
    replied
    I’ve been doing a good bit of work for a dump truck outfit here, but most of their stuff is aluminum. I’ll say this for sure, the truck he has that don’t have the seams welded in full end up in terrible shape. Dirt, water and muck get between the old floor and the new one and it makes a heck of a mess. In fact, he bought a couple used trucks a few months ago and that was the exact issue we ran into. Had a lot to cut out of those two. That goes for the plastic liners as well. Those that don’t have the hold downs welded the full length have become a thorn in my side. Takes a good few hours to get the junk out and pulled flat enough to weld it up. Their last mechanic tried stitch welding and then filling the gaps with silicone. That probably looked good for about a week. Now it’s just more I have to remove before I make the repairs.

    Leave a comment:


  • Zig
    started a topic Reflooring dump bed

    Reflooring dump bed

    Hey guys I’m new here and need some advice. I have a customer ordering some ar-450 3/16” plate to lay in his dump truck floor and wants me to weld it in. I’d like some tips if there are any should I just stitch weld or try to weld solid? Does it need a preheat being only 3/16”? I’ve never welded hardened plate I’ve got a pipe and some structural background thanks in advance for any replies
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