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Why is it not recommended to repair the gear after quenching and fracture in the slewing drive

Publish time:2023/12/07 News Views:59

U-TRSM engineers are also involved in many processes during the production and machining of slewing drives and provide timely optimisation and feedback on details in order to design and produce quality products. As an accessory in a slewing drive, tooth hardening is a very critical process in the production of slewing bearings. Cracks may appear on the tooth surface if the tooth is not quenched properly, and after cracks are produced it is generally not recommended to weld them, but to scrap them directly. If cracked teeth are welded, the teeth will change as follows:

quenching of the gear

1. Changes in tensile strength: After welding, the tensile strength of the tooth will be reduced due to the stresses and deformations generated during the welding process, which will affect the load carrying capacity and service life of the tooth.


2. Changes in toughness: After welding, the toughness of the tooth will decrease, which will lead to the fracture of the tooth when it is impacted or vibrated greatly.


3. Changes in wear resistance: Welded teeth can suffer a loss of wear resistance due to factors such as the high temperatures and cooling that occur during the welding process, which can affect the life and efficiency of the tooth.


In order to avoid these changes adversely affecting the mechanical properties of the tooth, welding repair of the tooth is not recommended. If conditions do not permit, some measures can be taken to improve weld quality and minimise stress generation. For example, selecting appropriate welding materials and specifications, conduct preheating treatment and slow cooling after welding, etc. In addition, if a welding process is necessary, the appropriate tests and experiments should be carried out after the welding is completed.

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