High quality ss304 /316 Stainless steel Square head Machine Screws
 
Description:

1. Firstly, remove the sludge on the surface of broken screw and kill the center of the section with a center jack. Then install a drill bit with diameter of 6-8 mm with an electric drill and drill hole at the center jack hole of the section.After drilling through the hole, take off the small bit and replace it with a bit with a diameter of 16mm. Continue to enlarge and drill through the hole of the broken bolt.

2. Take a diameter of 3.2 mm below the electrode with small current in the broken bolt hole from inside and outside for surfacing welding the parts take off half the length of the bolt the whole can. Began surfacing welding arc not too long in order to avoid the broken bolt outer wall burn through. After surfacing to broken bolt end face as a surfacing out a 14-16 mm high 8-10 mm in diameter of the cylinder.

3. After surfacing, hammer the end face with a hand hammer to make the broken bolt vibrate along its axial direction. The heat generated by the previous arc and the subsequent cooling, combined with the vibration at this time, will loosen the thread between the broken bolt and the body.

4. Carefully observe when a trace of rust is found to leak from the fracture after knocking, you can take the M18 nut sleeve on the overlaying stigma and weld the two together.

5. After welding, it is cool and hot, use a box wrench to cover the nut and twist it back and forth, or use a small hand hammer to strike the end face of the nut to remove the broken bolt.

6. After removing the broken bolt, process the screw buckle in the frame with appropriate taps to remove rust and other sundries in the hole.