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Shrink a bearing by welding to remove

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  • Shrink a bearing by welding to remove

    The wheel bearing on my customer's baby stroller for jogging failed and all of the balls came out leaving the outer race a heavy press fit in the hub. The bike store said that they would have to grind through the outer race to remove it, but they were too busy to deal with it.
    I used an ID puller to grip the ball race of the bearing because the bearing was up against a shoulder and I couldn't get behind it. I tried with the setup shown below but it wouldn't budge.

    1. ID bearing puller
    Click image for larger version

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    Miller Thunderbolt
    Smith Oxyacetylene Torch
    Miller Dynasty 200DX
    Lincoln SP-250 MIG Welder
    Lincoln LE 31 MP
    Lincoln 210 MP
    Clausing/Coldchester 15" Lathe
    16" DuAll Saw
    15" Drill Press
    7" x 9" Swivel Head Horizontal Band Saw
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    Bridgeport

  • #2
    Next I tried to use a more rigid backup to prevent the spokes from acting like springs, which reduced the impact load as shown below:

    2. Rigid backup

    Click image for larger version

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    Miller Thunderbolt
    Smith Oxyacetylene Torch
    Miller Dynasty 200DX
    Lincoln SP-250 MIG Welder
    Lincoln LE 31 MP
    Lincoln 210 MP
    Clausing/Coldchester 15" Lathe
    16" DuAll Saw
    15" Drill Press
    7" x 9" Swivel Head Horizontal Band Saw
    20 Ton Arbor Press
    Bridgeport

    Comment


    • #3
      This also didn't work, so I used a TIG torch with a small diameter conventional nozzle to melt the outer race in spots and allow it to shrink as the metal cooled off. I didn't actually add any metal. The TIG setup is shown below:

      3. TIG melting spots on outer race

      Click image for larger version

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      Miller Thunderbolt
      Smith Oxyacetylene Torch
      Miller Dynasty 200DX
      Lincoln SP-250 MIG Welder
      Lincoln LE 31 MP
      Lincoln 210 MP
      Clausing/Coldchester 15" Lathe
      16" DuAll Saw
      15" Drill Press
      7" x 9" Swivel Head Horizontal Band Saw
      20 Ton Arbor Press
      Bridgeport

      Comment


      • #4
        I used the "Solid backup" shown in picture #2 and the race came right out as shown below:

        4. Race removed from hub

        Click image for larger version

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ID:	590634
        Miller Thunderbolt
        Smith Oxyacetylene Torch
        Miller Dynasty 200DX
        Lincoln SP-250 MIG Welder
        Lincoln LE 31 MP
        Lincoln 210 MP
        Clausing/Coldchester 15" Lathe
        16" DuAll Saw
        15" Drill Press
        7" x 9" Swivel Head Horizontal Band Saw
        20 Ton Arbor Press
        Bridgeport

        Comment


        • #5
          Here is what the inside of the outer race looked like with the TIG melted spots. The ID of the hub wasn't affected.

          5. TIG welded outer race
          • Have you ever used this or a similar method to remove a bearing or hub?
          Click image for larger version

Name:	5. TIG welded outer race.jpg
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ID:	590636
          Miller Thunderbolt
          Smith Oxyacetylene Torch
          Miller Dynasty 200DX
          Lincoln SP-250 MIG Welder
          Lincoln LE 31 MP
          Lincoln 210 MP
          Clausing/Coldchester 15" Lathe
          16" DuAll Saw
          15" Drill Press
          7" x 9" Swivel Head Horizontal Band Saw
          20 Ton Arbor Press
          Bridgeport

          Comment


          • #6
            No I haven't, good thinking Don
            Richard

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            • #7
              Yup, I usually just run a bead completely around the inside of the race with 6011 and let it cool. Works pretty slick.
              Nice job helping out the jogger.

              ---Meltedmetal

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              • #8
                Saw this posted on another site.
                A FEW OF MY TOYS !!!

                LinuxMint
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                Miller Roughneck 2E
                Lincoln Weldpak 100
                HTP MTS 160
                Chicago Electric 80amp Inverter
                Victor O/A

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                • #9
                  A few years back I welded for a large compressor company. The guy who rebuilt the screw compressors would bring me the rotors to weld a bead on the race to remove it. I would run a bead and he would stand them up and the race would just fall off...Bob
                  Bob Wright

                  Spool Gun conversion. How To Do It. Below.
                  http://www.millerwelds.com/resources...php?albumid=48

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                  • #10
                    This is done all the time to remove worn steel bushings in excavator booms. A pass or two inside the race with your stick welder and whatever rod happens to be in it loosens the bushing.
                    Last edited by old jupiter; 09-06-2018, 09:57 AM.

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                    • #11
                      I don't feel like typing much so I'm going to keep it short, sweet and to the point. It's not magic it's knowledge being applied.

                      It's the result of restrained expansion. Iron and steel will when heated expands in all directions and when cooled shrink in all directions. While restraining it's expansion in one direction, it will still contract from that direction when cooled. It's condition is said to be "upset" as a result.

                      That my friends is the why.
                      Image result for weld expansion and contraction


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                      • #12
                        I have that same inside puller thing. They never seem to work very well. Maybe I'll add heat next time.

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                        • #13
                          Heavy duty bearing races in trucks & trailers........if the bearing is already shot.......allot of time can be saved by just running a bead a 180 degrees apart ..........falls right out....

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