Techniques of Using Explosion-Proof Knock Wrench to Disassemble Corroded Nut
1) Remove the nut with less serious corrosion. First use a knock wrench to knock the nut around, and then take some oil drops on the bolt and nut. After a period of time, use the knock wrench to turn the nut clockwise to force the rust on it to fall off, and then rotate the nut counterclockwise. Repeated two or three times, generally can remove the rust of the nut.
2) Remove the nuts with serious corrosion. The method is basically the same as 1), except that the oil is not dripped on the bolts and nuts, but the "soaking" method is used. The "soak" time is several hours, during which the nut is struck with a tapping wrench from time to time.
3) If the above method does not work or is in a hurry to disassemble, the bolt and nut can be locally heated by heat sources such as acetylene-oxygen welding or blowtorch to force the oxide scale at the corroded place to fall off. The thermal expansion coefficient of the nut is larger than that of the bolt. When the nut is heated to dark red, unscrew the nut with a percussion wrench while it is hot, in this way, the nut with very serious corrosion can be screwed off in a relatively long period of time.
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