1. First, remove the sludge from the broken screw surface and use the center pin to smash the center of the section. Then use a drill with a diameter of 6-8 mm to drill the hole in the center of the section. Note that the hole must be drilled. After the hole is drilled, the small drill bit is removed, and the drill bit with a diameter of 16 mm is replaced, and the hole of the broken bolt is further expanded and drilled.
2. Take a welding rod with a diameter of 3.2 mm or less. Use medium and small currents to make half of the entire length of the bolt from the inside to the outside of the hole where the bolt is drilled from the inside to the outside. The start arc should not be too long when starting welding. So as not to break through the outer wall of broken bolts. Surfacing to the top end of the broken bolt and then continue to surpass a diameter of 14-16 mm 8-10 mm high cylinder.
3、After surfacing, hammering the end face with a hammer will cause the broken bolt to vibrate in the axial direction. Because the heat generated by the arc and the subsequent cooling plus the vibration at this time will break the bolt and the thread of the body. Looseness between.
4. Carefully observe that when a trace of rust leaks from the fracture at the time of percussion, the nut of M18 can be set on the screed of the welding and the two are welded together.
5, after welding, cool, hot and cold with a plum wrench to twist around the nut back and forth can also twist back and forth side with a small hammer hit the end of the nut so that the broken bolt can be removed.
6. Take out the broken bolt and use a suitable silk hammer to process the thread in the frame once to remove the rust and other impurities in the hole.
Whether it is the tiny screws of electronic devices, or the general screws of furniture and electrical appliances, or even large screws used in engineering, construction, bridges, transportation equipment, airplanes, trams, and automobiles, screws occupy a very important position in these fields