First remove the sludge on the surface of the broken screw and the broken head, use the center gun to kill the center gun of the section, and then use an electric drill to install a drill bit with a diameter of 6-8 mm to drill the hole in the center of the section, pay attention to 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 and drill through the hole of the broken bolt.
Take the electrode with a diameter of less than 3.2 mm and use a medium and small current to carry out surfacing welding from the inside to the outside in the hole of the broken bolt. Take half of the entire length of the broken bolt. When starting surfacing welding, the arc should not be too long to avoid burning through the outer wall of the broken bolt. After surfacing to the upper end face of the broken bolt, continue surfacing to form a cylinder with a diameter of 14-16 mm and a height of 8-10 mm.
After the surfacing is completed, hammer the end face with a hammer to make the broken bolt vibrate along its axial direction. Due to the heat generated by the previous arc and the subsequent cooling, plus the vibration at this time, the broken bolt and the thread of the body will be between produce looseness.
Carefully observe, when it is found that a small amount of rust leaks from the fracture after the knocking, you can take the M18 nut and put it on the surfacing column head and weld the two together.
After welding, use a Torx wrench to cover the nut while it is still hot, and twist it back and forth. You can also tap the end face of the nut with a small hand hammer while twisting back and forth, so that the broken bolt can be taken out.
After taking out the broken bolt, use a suitable tap to process the thread in the frame to remove rust and other debris in the hole.
Post time: Sep-28-2022
Keyword: do sheet metal screws work on wood
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