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  1. #1
    Join Date
    May 2008
    Troy, MI

    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

    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
    Miller Spectrum 375 Plasma Torch

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