Question: When the motor shaft is in use, the journal suddenly breaks. I wonder if this situation can be repaired?
Answer: In the process of using the motor shaft, it is inevitable that various problems will be encountered. Among them, the journal is relatively easy to break. When it is broken, it will cost a lot of money to buy a new one. Can it be repaired? How to solve this problem?
Theoretically speaking, the motor shaft journal fracture can be repaired, generally by welding, in which welding and post-weld heat treatment are pipe fittings.
It is necessary to clean the broken part of the motor shaft journal before welding. Do not sloppy when cleaning, especially the impurities that may bring hydrogen.
The junction 857 electrode is used during welding, and the diameter requirement is 3.2. Before welding, the electrode needs to be heated and dried at the heat source to ensure that the electrode is dry and moisture-free. It is necessary to use reverse welding on the DC welding machine, and the electrode is required to be staggered For welding, ensure that the bottom layer of welding can form a U-shaped groove. Parallel welding is not recommended.
When welding, choose a current value of 90～100, and the welding speed should not be too fast to avoid excessive temperature of the motor shaft.
After the welding is completed, it is necessary to use the gas cutting torch to heat the repair welding position immediately. The heating position cannot exceed the 100-120 mm area of the repair welding position. In order to ensure uniform heating, it is necessary to continuously rotate the motor shaft during heating.