Abstract
The possibility of joining composite materials, conventional steel and lighter aluminum alloy, is tested using friction welding that preserves the natural environment greatly. The friction welding of aluminum alloy, Al-Mg (A5056), and carbon steel (S45C) are done under various experimental conditions and the friction welding characteristics are examined. The mechanical property (tensile strength) of the welded specimen has enough strength under the friction welding conditions of 1 000 rpm, the friction pressure of above 20 MPa, the friction time of less than 1 second and a quite high upset pressure near the plastic flow pressure of A5056. The macroscopic and microscopic interface structures are also examined in relation to the friction welding conditions in order to clarify the joining mechanism of the interface between different materials by the friction welding. Moreover, the heat quantity during friction welding that relates closely to the generation of the inter metallic compound and the joining mechanism is also examined. The amount of upset that relates closely to the mechanical properties of the welded specimen is also examined.
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