1. Firstly, clear away the mud from the surface of the broken self-locking nut, and use a center punch to mark the center of the uniform cross-section. Then, install a drill bit with a diameter of 6-8 millimeters into the electric drill and drill a hole at the center of the cross-section.After drilling through the hole, remove the small drill bit and replace it with a drill bit with a diameter of 16 millimeters. Continue to expand and drill through the broken bolt hole.
2. Take welding rods with a diameter of 3.2 millimeters or smaller and weld the entire length of the broken bolt from the inside to the outside of the drilled hole using medium to low current.
After the welding is completed, use a hammer to strike the end face of the broken bolt to create movement along its axis. Due to the heat generated by the previous arc and subsequent cooling, coupled with the need for action at this time, there will be looseness between the broken bolt and the thread of the body.
4. When a small amount of rust is found to leak out from the fracture after careful observation, the self-locking nut of M18 can be placed on the welded column head and welded together.
5. After welding, gently cool and use a ring wrench to twist the nut back and forth while it is hot. You can also use a small hammer to tap the end face of the nut while twisting back and forth to remove the broken bolt.
After removing the broken bolts, use a suitable hammer to process the threads inside the frame once to remove rust and other debris from the holes.