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  1. #1
    Join Date
    May 2009

    Default Type of joint (lap, butt, cope)?

    I am getting ready to start a trailer project and ran across this forum a few days ago. I am impressed at both the talent and patients here. Good group of people.

    I am familiar with both Stick and Mig welding and have done both. I am no where proficient with either but seem to get the job done in a hobby/ad-hoc fashion.

    The trailer project I am starting is a smaller 10x5 #3500 axle utility trailer. Main use for hauling camping supplies with a utility shell atop.

    It will be constructed with 2 x 3 x 3/16 angle.

    The machines I have available to me are:

    Mig - Dayton 90/110 amp ac/dc
    Stick - Miller dialarc 250 ac/dc

    My primary question is what kind of Joint would be recommended for this project?

    Mitered butt joint, lap joint or a coped joint. Maybe this is a matter of taste, but I would like to make sure that there is not a structural reason for each type before I discount them.

    On a side question, or maybe it has to do with the type of joint used, I would like to use the Mig as it seems to be easier but I don't seem to be getting good penetration on clean metal (3/16"). I am using flux-core wire. Does shield-gas wire get better penetration?

    It is harder for me to see what I am doing (can't see the joint with an auto darkening #10) but I read in other threads that I will probably need a stronger work light and use one of those white weld pencils to mark the joints and

    I hope what I am asking makes sense. I really want to do a good job since I will be pulling a trailer down the road and would rather not have the thing fall apart on the first (or umpteenth) bump.

    Thanks for any advice.

    I forgot to mention that the joints I asked about are for the bed frame corners. Forgot that only my Wife could read my mind (intentions).

    Last edited by FutureShock; 05-12-2009 at 02:14 PM. Reason: Add forgotten detail

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