Agricultural machinery broken bolt how to take out
September 04 02:32:01, 2025
1. First, remove the sludge and debris from the broken surface of the bolt. Use a center trowel to carefully break up the center section of the bolt. Then, use an electric drill to create a pilot hole with a diameter of 6 to 8 mm at the center of the broken area. Make sure the hole is drilled straight and deep enough. Once the initial hole is made, replace the small drill bit with one that has a diameter of 16 mm and enlarge the hole further to prepare for the next step.
2. Take a welding rod with a diameter of 3.2 mm or smaller. Set your welder to medium or low current settings and begin surfacing welding from the inside out, starting at the bottom of the broken bolt hole. Begin the arc at the base of the hole to avoid damaging the outer wall of the bolt. Continue welding until you reach the top of the broken bolt. Then, build up a cylindrical shape around the hole, with a diameter of 14 to 16 mm and a height of 8 to 10 mm. This will provide a solid base for future removal.
3. After completing the surfacing, use a hand hammer to gently tap the end face of the welded area. This will cause the broken bolt to vibrate along its axis. The heat generated during welding, combined with the subsequent cooling and the vibration, will help loosen the bond between the broken bolt and the surrounding threads in the body.
4. Carefully observe the area after tapping. If you notice any signs of iron rust coming out of the fracture, it's time to proceed. Place an M18 nut over the welded area and weld it in place, ensuring a strong connection between the nut and the surfacing.
5. Once the welding has cooled down, use a pipe wrench to grip the nut and twist it back and forth. While twisting, lightly tap the nut with a small hand hammer to help break the remaining bond between the bolt and the thread. This should allow the broken bolt to be removed gradually and safely.
6. After removing the broken bolt, use a suitable thread chaser or a silk hammer to clean and recondition the threads inside the hole. This will remove any rust, debris, or foreign material that may have accumulated, ensuring the hole is ready for a new bolt.
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