Fastener knowledge: steps to remove broken screws cleverly

In many cases, hardware screws will suddenly break off, but some people can't take out the broken screws. For this kind of accident, tell everyone how to take out the broken screws cleverly.

1. First, remove the sludge on the surface of the broken screw and use the center 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 through, 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. At the beginning of the surfacing welding, take half of the entire length of the bolt. Do not be too long to avoid burning through the outer wall of the broken bolt. After surfacing to the upper end of the broken bolt, continue to weld a cylinder with a diameter of 14-16 mm and a height of 8-10 mm. (Guide: Three types of difficult-to-dismantle fasteners)

3. After the surfacing is completed, hammer the end face with a hand hammer to cause the broken bolt to vibrate along its axial direction. Due to the heat generated by the arc and the subsequent cooling plus the vibration at this time, the broken bolt and the There is looseness between the threads of the body.

4. Carefully observe 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 both.

5. After welding, use a torx wrench to set the nut on the nut while it is still warm. 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 bolts, use a suitable wire hammer to process the threads in the frame to remove rust and other debris in the holes.

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