How to remove the broken high-strength bolts?

How to remove the broken high-strength bolts? Here's a brief look at it. 1. First remove the silt on the surface of the broken high-strength bolts, use the center gun to kill the center of the cross section, use a hand drill to install a twist drill with a diameter of 6-8 mm, and drill a hole in the center of the cross section. Note that the hole must be drilled through. After the hole is drilled through, take out the small drill bit, replace it with a twist drill with a diameter of 16mm, and expand and drill the hole of the broken bolt again. 2. Take a welding wire with a diameter of less than 3.2mm, use small and medium currents in the drilled hole of the broken bolt, and carry out surfacing welding from the inside to the outside. The part where the surfacing welding begins takes half of the entire length of the broken bolt. When gradually surfacing, the arc should not be too long to prevent the surface of the broken bolt from being burned through. After surfacing to the upper end surface of the broken bolt, continue surfacing to produce a cylinder with a diameter of 14-16mm and a height of 8-10mm. 3. After surfacing, hammer the end face with a hammer to make the broken bolt vibrate along its radial direction. Because the heat and subsequent cooling caused by the previous electric arc, coupled with the vibration at this time, will cause loosening between the broken bolt and the thread of the body. 4. Carefully observe the high-strength bolts. When a small amount of rust is exposed from the fracture surface during beating, you can take the M18 bolt sleeve and weld them together on the top of the surfacing welding column. 5. After welding, use an open-end wrench glove while it is still hot, and shake it back and forth on the bolt. You can also hit the end face of the nut with a hammer with both hands while shaking back and forth, so that the broken bolt can be removed. 6. After removing the broken bolt, use a suitable screw hammer to process the screw hole in the sound card frame to remove the rust and other dirt in the hole. Whether it is a small screw such as an electronic product, or a general screw for furniture and electrical appliances, or even a large screw used in engineering projects, engineering construction, road bridges, transportation equipment, airports, electric vehicles, automobiles, etc., screws occupy a very important position in these industries.