To reduce the thermal effect, to increase the bonding strength, and to achieve the complicated and fine bonding by continuously or intermittently applying the ultrasonic wave to a work to be bonded arranged in a mold when a poured second work to be bonded is in a semi-solidified condition.
A solid 5 of a first work to be bonded is inserted in a die 7. A molten metal 6 of a second work to be bonded of a separately molten aluminum alloy, etc., is poured into the die 7. In a solidifying process in which the molten metal 6 of the second work is in a semi-solidified condition, the ultrasonic vibration is continuously or intermittently applied to the solid 5 of the first work by a pressing plate. The ultrasonic vibration is of, for example, 18 KHz and 500 W. After the molten metal 6 of the second work is completely solidified, a vibrating body 3 is detached to complete the bonding. By applying the ultrasonic wave, the shear strength of at least two times that of the ultrasonic cast-in bonding in the liquid condition can be obtained. The cast-in bonding is possible even when the first work is a round bar, and its bonding surface forms an acute angle in the direction of the ultrasonic vibration.
HAN SUSUMU
FUJII TOSHIO
FUYAMA NOBUYUKI
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