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Welding a steel plate to the 5th wheel plate.

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  • Welding a steel plate to the 5th wheel plate.

    I have a customer that brought me a new 5th wheel plate for a dolly on his gravel train.

    He had the old 5th wheel plate that someone welded a steel plate too, What the plate is for, Is so when they back up the pup trailer, theres a pin that comes down into a hole in the plate to keep the pup trailer straight.

    So we duplicated the plate with a hole in it and welded it to the 5th wheel plate.

    I normally dont like welding to cast but I assumed this was a cast steel which is semi tolerant to welding on.
    Plus the other one has been working for the last 8 years.

    We did all the normal preheat and post heat.

    For all you truck mechanic welders, Is this a normal practice and have you seen this type of design.

  • #2
    I can't say that I have seen that design, but I do all the weld repairs for the local TA Truckstop and the Petro Truckstop and have done plenting of weld repairs on fifth wheels and fifth wheel plates with 100% success. I wouldn't worry about it.

    Also, you assumed correctly. They are made from a cast steel.
    Last edited by jpence38; 04-16-2013, 07:22 AM.


    • #3
      J. Pence38, Thanks for the reply, I look at you list of equipment and we have alot of the same equipment.


      • #4
        When in doubt of what material your working with... just give it a good ole spark test. Theres lots of compare charts on the internet.


        • #5
          I started looking at it and I think it broke from a lack of weld, My forman only put one pass on each side, when I would have flushed it out on the top and put 3 passes on the bottom.

          I cant always oversee every thing that they do unfortunately.


          • #6
            Originally posted by Portable Welder View Post
            J. Pence38, Thanks for the reply, I look at you list of equipment and we have alot of the same equipment.
            How is business up your way?? Doing pretty good down here.


            • #7
              Ther'es 3 of us and everytime I think we are going to be caught up another job seems to pop up, we always stay busy throughout the summer for sure.

              This is are 25th year in business which helps having all the contacts that we have built through out the years.

              Its funny when I look at your list of equipment I find that we have alot of the same stuff

              Mod 32 bender, Dynasty 300, stl 150, suitcase feeders ( I run the RC feeders ) 50 ton press, Spool guns, Push pull feeders, Trail blazers, and a few other items.


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