Characterization of Mechanical Properties and Microstructure in CK35 and 18CrMo4 Steel Welded by Friction Welding

Kamran Amini, Ali Fatehi, Ali Boroujerdi


Machine parts can be produced by one of various manufacturing methods such as forging, machining, casting or welding methods. Choice of the manufacturing method depends on production costs of the alternatives for individual parts. Friction welding method as a mass production process is finding increasing industrial acceptance, particularly for joining dissimilar materials. Mechanical properties and micro-structure of the friction welding between two non-similar materials of CK35 and 18CrMo4 have been analyzed by using mechanical tests like tensile, bending and hardness, and microstructure analysis with scanning electron microscope and optical microscope. The results showed that the maximum tensile strength (576 MPa) and maximum bending angle without fracture (30 degree) is achieved in this condition: 13 seconds of pre-heating (friction time) and 3 seconds of forging time. The micro-structure analysis showed the presence of base material, HAZ, and thermo-mechanical region in both sides of friction welding. Meanwhile the maximum hardness is in the welded region.

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