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  1. #1
    Join Date
    May 2008
    Location
    Troy, MI
    Posts
    339

    Default 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 Images Attached Images
    Last edited by Don52; 10-18-2011 at 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

  2. #2
    Join Date
    Feb 2011
    Posts
    18

    Default

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

  3. #3
    Join Date
    Dec 2009
    Location
    Williams Lake, British Columbia
    Posts
    722

    Default

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

  4. #4
    Join Date
    May 2008
    Location
    Troy, MI
    Posts
    339

    Default

    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

  5. #5
    Join Date
    Feb 2007
    Location
    Near Dallas, TX
    Posts
    214

    Default

    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

  6. #6
    Join Date
    May 2008
    Location
    Troy, MI
    Posts
    339

    Default

    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 Images Attached Images
    Last edited by Don52; 10-18-2011 at 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

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