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  1. #1
    Join Date
    Jun 2021

    Default optimal weld geometry for tractor implement

    Hello everyone!

    I am making an undercutter/bed lifter tractor attachment. The goal is to slide a slanted board 10-12inch (25-30cm) deep into the ground and lift the soil just enough, so that you don't need to use a shovel to dig out root crops such as garlic or carrots. This is how it looks: and in action:

    The final piece I need to decide on is how to weld the bottom lifting board to the sidewalls. There are a few options on how to do it.

    The first options is to weld the sidewalls on top of lifting board - . The downside is that the lifting board needs to be extended over the sidewalls. How much should the lifting board be over the sidewall? I am thinking at least 15mm (5/8inch). Longer lifting board also causes slightly higher forces so this may not be optimal.

    The alternative is to place the lifting board between the sidewalls - or or somewhere in between. Which configuration do you think is the hardest to break? Which electrodes do you recommend? The material I am using is hardox450, 15mm (~3/8inch) thick.

    Best regards

  2. #2
    Join Date
    Aug 2008
    near Rockhampton


    Welding it on the bottom of the legs is the easiest and I cannot see that much disadvantage power loss wide compared to welding it between the legs. Around these parts what you are making are made in a much bigger scale, pulled behind large crawler tractors and they are all welded on the bottom of the legs. Either way I do not think it matters which way you go.

    As for welding rods. A low hydrogen rod like a xx16 or xx18. While it is said Hardox 450 under 20mm thick does not need preheating prior to welding, I think if it was preheated to about 60C it would only be beneficial.
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    Gold, the colour of choice for the discerning person.

  3. #3
    Join Date
    Apr 2021


    I don't think it matters where it is welded either.

    Are you using the top link to adjust the angle of the blade?

    The three point linkage mounting points usually need to be in the same vertical plane. I assume yours are not, on purpose.

    (Your image added for easy reference)

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    Last edited by Jack Ryan; 8th Jun 2021 at 11:26 AM. Reason: Image added

  4. #4
    Join Date
    Mar 2011


    General rule I use for welded parts is try to place your welds in shear or compression, try to avoid placing them in tension.

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