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Firstly, remove the sludge on the surface of the broken stainless steel screw head and use a center gun to kill the center of the section. Then, use an electric drill to install a drill with a diameter of 6-8 millimeters and drill a hole at the center of the section, making sure to drill the hole thoroughly. After drilling through the hole, remove the small drill bit and replace it with a drill bit with a diameter of 16 millimeters. Continue to enlarge and drill through the hole where the bolt is broken.
Take a welding rod with a diameter of less than 3.2 millimeters and use a small to medium current to weld from inside to outside in the drilling hole of the broken bolt. Take half of the entire length of the broken bolt at the starting point of the weld When starting to weld, the arc should not be too long to avoid burning through the outer wall of the broken bolt After welding to the upper end face of the broken bolt, continue welding to form a cylindrical body with a diameter of 14-16mm and a height of 8-10 mm.
After welding, use a hand hammer to strike the end face of the bolt to cause vibration along its axial direction Due to the heat generated by the previous arc and subsequent cooling, as well as the vibration at this time, there will be looseness between the broken bolt and the threads of the machine body.
Upon careful observation, if a trace amount of rust is found to have leaked from the fracture after tapping, the M18 nut can be taken and fitted onto the welded column head, and the two can be welded together.
After welding, let it cool slightly while it is still hot. Use a plum blossom wrench to twist the nut back and forth, or use a small hammer to strike the end face of the nut while twisting it back and forth, in order to remove the broken bolt.
After removing the broken bolt, use a suitable hammer to process the threads inside the frame to remove rust and other debris from the holes.
