1. First, remove the sludge from the broken screw on the surface of the breakage. Center the crucible with the center crucible and then use an electric drill to drill a drill with a diameter of 6-8 mm. Drill the hole at 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 the electrode with a diameter of 3.2 mm or less and use medium and small currents to take half of the entire length of the bolt from the inside to the outside of the hole where the broken bolt is drilled from the inside to the outside of the surfacing. The starting arc during start-up welding should not be too long. So as not to break through the outer wall of the bolt to burn through. Surfacing to the top end of the broken bolt and then continue to build a cylinder with a diameter of 14-16 mm high 8-10 mm.
3.After welding, hammering the end face with a hammer causes the broken bolt to vibrate in the axial direction. Since the heat generated by the arc and the subsequent cooling together with 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 soldering, cool and hot, use a box wrench to twist the nut back and forth, and twist it back and forth. Tap the nut face with a small hammer to remove the broken bolt.
6. Take out the broken bolt and use a suitable tap to process the thread in the frame once to remove the rust and other impurities in the hole.