1. First, remove the sludge on the surface of the broken screw and use the center blaster to kill the center of the section. Then use an electric drill to install a 6-8 mm diameter drill to drill the hole at the center of the section. Note that the hole must be drilled through. After the hole is drilled, remove the small drill bit and replace it with a drill bit with a diameter of 16 mm, and continue to expand the hole of the broken bolt and drill it through.
2. Take a welding rod with a diameter of less than 3.2 mm and use small and medium current to carry out surfacing from the inside to the outside of the hole of the broken bolt. Take half of the entire length of the bolt at the beginning of the surfacing . When starting the surfacing, do not start the arc too long In order to avoid burning through the outer wall of the broken bolt . Surfacing to 3. After the surfacing is completed, hammer the end face with a hand hammer to make the broken bolt vibrate along its axial direction . This is added to the heat generated by the previous arc and subsequent cooling. Vibration at the moment will cause looseness between the broken bolt and the thread of the machine body.
4. Observe carefully. When you find that there is a trace of rust leaking from the fracture after knocking, you can take the M18 nut and put it on the surfacing stigma and weld the two together.
5. After welding, use a torx wrench to set the nut on the nut while it is still cool and twist it left and right. You can also twist it back and forth while tapping the end face of the nut with a small hand hammer so that the broken bolt can be taken out.
6. After taking out the broken bolt, use a suitable tap to process the thread in the frame to remove the rust and other debris in the hole.
