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  1. #1
    Join Date
    May 2008
    Location
    Troy, MI
    Posts
    306

    Default Trailer Cracked Frame Repair

    My latest welding job was to repair the cracked frame of my friendís landscape trailer. I believe that the hanger wasnít welded in the proper position on the frame, which would have allowed the shackle to be vertical in the unloaded condition. This most likely caused the high forces in the hanger, and caused it to break. Ever since the hanger broke, the eye of the spring functioned as a slipper spring and rubbed on the frame. Unfortunately the frame wasnít thick enough so the eye of the spring eventually dug a slot in the frame. Eventually the slot was deep enough for the eye of the spring to be trapped by the hook that it created in the side of the slot of the frame. When the trailer was loaded it caused the spring to lengthen, which put high forces on the hook of the slot. This caused the metal to be raised on the hook side of the slot and eventually caused the frame to crack.

    This repair should get my friend through his busy fall leaf clean up season. In the spring I would like to replace the frozen pins and weld a pipe into the frame to serve as a hanger for the shackle. This will allow the fore and aft degree of freedom that the spring requires, without raising the trailer height too much. The heavy duty axle and truck tires already make the trailer on the high side. A torsional axle might be a better solution to minimize the trailer height, as wrench bender pointed out in a previous post.

    http://www.redneck-trailer.com/2009/A/A26-A29.pdf
    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
    Bridgeport

  2. #2
    Join Date
    May 2008
    Location
    Troy, MI
    Posts
    306

    Default

    More Pictures:
    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
    Bridgeport

  3. #3
    Join Date
    Apr 2006
    Location
    TAXACHUSSETTS
    Posts
    1,475

    Default

    Having a 200 dx why not stick weld this with 7018-3/32 seems like it would have been easier/faster then tigging that frame.Don,t know if those sharp corners on your reinforcing plates was a good idea also?Just my opinion,everyone does things different.
    BB402D
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  4. #4
    Join Date
    Jul 2008
    Location
    Houston TX
    Posts
    240

    Default

    Quote Originally Posted by Don52 View Post
    More Pictures:
    Nice repair!
    I certainly don't expect this one to break again.
    Maybe somewhere else, but not at the repair
    pg
    Dynasty 200 DX_set up on 3 phase
    Coolmate 3
    MM 251 w/ Spoolmatic 30A
    HTP 625 Micro Cut Plasma Cutter
    Victor O/A Rig
    Bridgeport Mill_3 phase (w/ Acu-Rite 4 axis DRO)
    10 inch South Bend Lathe_3 phase
    Baldor Double Cup Tool Grinder_3 phase
    Baldor 10 inch Buffer
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    Cyclone 2ft X 3ft Bead Blast Cabinet
    Quincy 325 2stg- Air Compressor_3 phase
    Graymills Built-in Parts Washer
    Rockwell/Delta Planer, HD Shaper, Uni-Saw etc.


  5. #5
    Join Date
    May 2008
    Location
    Troy, MI
    Posts
    306

    Default

    Quote Originally Posted by admweld View Post
    Having a 200 dx why not stick weld this with 7018-3/32 seems like it would have been easier/faster then tigging that frame.
    The frame is only 1/16 inch thick and I have better control with TIG. Plus I didn't want to get sparks on me as I was lying on my back under the frame to weld the horizontal, vertical, and overhead weld positions. It did take me a long time to weld it -- Stick would have been faster.

    Don,t know if those sharp corners on your reinforcing plates was a good idea also?
    You are right I should have chamfered or used a radius on the corners to reduce the stress concentration.

    I appreciate you taking the time to comment.

    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

  6. #6
    Join Date
    May 2008
    Location
    Troy, MI
    Posts
    306

    Default

    Quote Originally Posted by piniongear View Post
    Nice repair!
    I certainly don't expect this one to break again.
    Maybe somewhere else, but not at the repair
    pg
    I agree that it most likely won't fail where I welded it. For my last repair I painted the entire outside of the trailer with the Rustoleum conversion coating and then a glossy black top coat. It held up very well. In some of the pictures you can see some rust on that inside of the frame. I think that I will paint it in the spring to stop this failure mode.

    Thanks for your comments,
    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

  7. #7
    Join Date
    Jul 2008
    Location
    Houston TX
    Posts
    240

    Default

    Quote Originally Posted by Don52 View Post
    I agree that it most likely won't fail where I welded it. For my last repair I painted the entire outside of the trailer with the Rustoleum conversion coating and then a glossy black top coat. It held up very well. In some of the pictures you can see some rust on that inside of the frame. I think that I will paint it in the spring to stop this failure mode.

    Thanks for your comments,
    Don
    Yes sir, I like it!
    With a thickness of only .0625, using the DX200 Tig was the thing to do in my opinion.
    It sure made a nice clean repair.
    pg
    Dynasty 200 DX_set up on 3 phase
    Coolmate 3
    MM 251 w/ Spoolmatic 30A
    HTP 625 Micro Cut Plasma Cutter
    Victor O/A Rig
    Bridgeport Mill_3 phase (w/ Acu-Rite 4 axis DRO)
    10 inch South Bend Lathe_3 phase
    Baldor Double Cup Tool Grinder_3 phase
    Baldor 10 inch Buffer
    Rockwell 12 inch Disc Sander
    Cyclone 2ft X 3ft Bead Blast Cabinet
    Quincy 325 2stg- Air Compressor_3 phase
    Graymills Built-in Parts Washer
    Rockwell/Delta Planer, HD Shaper, Uni-Saw etc.


  8. #8
    Join Date
    Sep 2005
    Location
    16919 Pole Rd. Brethren, MI 49619
    Posts
    4,364

    Default

    In some of the pictures you can see some rust on that inside of the frame. I think that I will paint it in the spring to stop this failure mode .
    Too good,,,,, especially since it looks like the operator just kept driving this long after an obvious problem developed.

  9. #9
    Join Date
    May 2008
    Location
    Troy, MI
    Posts
    306

    Default

    Quote Originally Posted by Sberry View Post
    Too good,,,,, especially since it looks like the operator just kept driving this long after an obvious problem developed.
    You are correct. I brought the formation of the slot to my friends attention several years ago, and suggested that we fix it. We only observed the formation of the crack about three weeks before I repaired it. Once the crack formed it really took off. The frame was entirely cracked on both sides and 25% across the top. There was very little holding the frame together! Once the slot got deep enough the spring must have applied a huge force to the frame to crack it so quickly.

    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

  10. #10
    Join Date
    Nov 2006
    Location
    Lake of the Ozarks MO
    Posts
    3,470

    Default

    Your friend must have a Guardian Angel
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