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Repair of Cracked Chute on Branch Chipper

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  • Repair of Cracked Chute on Branch Chipper

    My most recent project was to repair a wood chipper. The chipper had two chutes; one for leaves and finger sized twigs and the other for branches. The problem was the branch chute. When people feed branches in the chute and the branches get hung up, they tend to apply a back and forth motion to the branch to get it to feed into the chute of the chipper. This in turn applies a moment to the branch chute, which caused the recent failure. In this case the failure was cracking located on the top and both sides of chute at the flange where the chute attaches to the chipper base. As expected the cracks were in the heat affected zone next to the welds. I would have liked to add angle iron to the sides of the chute to beef it up, but I didn’t have enough time because my customer needed it for a church clean up. The original chute lasted about 10 years and I would expect that the repair will last as long even without the side angle iron, but I do expect it to eventually fail. In picture 4 you can see the penetration on the back side of the weld.
    Attached Files
    Last edited by Don52; 10-18-2011, 05:43 AM. Reason: Made font larger.
    Miller Thunderbolt
    Smith Oxyacetylene Torch
    Miller Dynasty 200DX
    Lincoln SP-250 MIG Welder
    Clausing/Coldchester 15" Lathe
    16" DuAll Saw
    15" Drill Press
    7" x 9" Swivel Head Horizontal Band Saw
    20 Ton Arbor Press
    Bridgeport
    Miller Spectrum 375 Plasma Torch

  • #2
    Looks good here. They should have reinforced those areas before it left the factory. Should last your lifetime!

    Comment


    • #3
      Picture 4 is a back penetration. This was done with mig right?
      Nice repair

      Comment


      • #4
        All of the welds were done with TIG. I only welded the outside of the chute. Picture 4 is what penetrated thru the crack from the TIG weld on the outside.
        Miller Thunderbolt
        Smith Oxyacetylene Torch
        Miller Dynasty 200DX
        Lincoln SP-250 MIG Welder
        Clausing/Coldchester 15" Lathe
        16" DuAll Saw
        15" Drill Press
        7" x 9" Swivel Head Horizontal Band Saw
        20 Ton Arbor Press
        Bridgeport
        Miller Spectrum 375 Plasma Torch

        Comment


        • #5
          Looks like the original weld was cold. Looks like there might have been a notch at the edge of the bead, and that's what started the crack.

          Dynasty200DX w/coolmate1
          MM210
          MM Vintage
          Lincoln AC225
          Victor O/A, Smith AW1A
          Cutmaster 81
          IR 2475N7.5FP
          Evolution Rage3
          Jancy USA101
          9" South Bend
          AEAD-200LE

          Comment


          • #6
            Attached is a close up picture taken before welding of one portion of the crack.
            This picture corresponds to the right side of the reinforcement tab on the top of the chute, which is shown after welding in picture 2.
            It does look like a cold lap on the left side.
            Picture 8 is another close up of the crack on the top.
            What do you think?
            Attached Files
            Last edited by Don52; 10-18-2011, 03:29 PM. Reason: Added Picture 8
            Miller Thunderbolt
            Smith Oxyacetylene Torch
            Miller Dynasty 200DX
            Lincoln SP-250 MIG Welder
            Clausing/Coldchester 15" Lathe
            16" DuAll Saw
            15" Drill Press
            7" x 9" Swivel Head Horizontal Band Saw
            20 Ton Arbor Press
            Bridgeport
            Miller Spectrum 375 Plasma Torch

            Comment


            • #7
              It wasn't nuclear grade or meant to last forever, no one wants to pay for it, Crap happens, likely the repair will outlast the rest of the machine.

              Comment


              • #8
                Now you're going to have up close pictures of your crack all over the internet

                Dynasty200DX w/coolmate1
                MM210
                MM Vintage
                Lincoln AC225
                Victor O/A, Smith AW1A
                Cutmaster 81
                IR 2475N7.5FP
                Evolution Rage3
                Jancy USA101
                9" South Bend
                AEAD-200LE

                Comment


                • #9
                  I learned a little bit and enjoyed your comments.

                  Thanks,
                  Don
                  Miller Thunderbolt
                  Smith Oxyacetylene Torch
                  Miller Dynasty 200DX
                  Lincoln SP-250 MIG Welder
                  Clausing/Coldchester 15" Lathe
                  16" DuAll Saw
                  15" Drill Press
                  7" x 9" Swivel Head Horizontal Band Saw
                  20 Ton Arbor Press
                  Bridgeport
                  Miller Spectrum 375 Plasma Torch

                  Comment

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