Studies on Ulltrasonic Butt Welding

研究了27 kHz和19 kHz振动频率系统的超声波对接焊接。焊接试件为6 mm厚的铝、防腐铝和铜板。这些焊接试件通过这些27 kHz和19 kHz的超声波对接设备成功地进行了端到端的连接，所用的超声波振动源包括一个径向到纵向振动方向转换器，其中6个(27 KHz)或8个(19 KHz)螺栓夹紧的朗之万型PZT换能器的振动频率为i7 kHz或19 kHz。使用的焊接试件用带锯切割，部分试件用铣床加工，只用氯油脱脂和清洗，不做进一步的加工。获得的铝试件的焊接强度约为100 Mpa，与试件强度相当，防腐铝和铜试件的强度约为250 Mpa，相当于防腐铝试件的强度。连接(1)铝试件、(2)铝-铜试件、(3)防腐铝试件和(4)6 mm厚的防腐铝-铜试件所需的功率分别为1-3KW/cm2、2-4KW/cm2、6-8KW/cm2和7-9KW/cm2。焊接表面附近的硬度略有下降，但在适当的焊接条件下，19 kHz的焊接没有引起硬度下降。

Ultralsonic butt welding by 27 KHz or 19 KHz vibration frequency systema was studied. Welding specimens used were aluminum, anticorrosive aluminum and copper plates of 6 mm thickness. These welding specimens are successfully joined end to end by these 27 KHz and 19 KHz ultrasonic butt welding equipments< The ultrasonic vibration source used consisted of a radial to longitudinal vibra- tion direction converter with 6 ( 27 KHz ) or 8 ( 19 KHz ) bolt-clamped Langevin type PZT transducers of i7 KHz or 19 KHz vibration frequency. Welding specimens used were cut by a bandsaw and some specimens were finished by a milling machine, and only degreased and cleaned by chlorothene and without further finishing. The weld strength of aluminum specimens obtained is about 100 MPa which was nearly equal to specimen strength, and the strength of anticorrosive aluminum and copper specimens obtained was about 250 MPa which is about anticorrosive aluminum specimen strength. Required power for joining (1) aluminum specimens, (2) aluminum to copper specimens, (3) anticorrosive aluminum specimens, and (4) anticorrosive aluminum to copper specimens of 6 mm thickness were 1 --3 KW/cm^2, 2 -- 4 KW/cm^2, 6 -- 8 KW/cm^2, and 7 -- 9 KW/cm^2.The weldment sections of specimens were tested by a microvickers hardness tester. A slight decrease of hardness adjacent to a welding surface was noted, but no decrease was noted by a 19 KHz welding with adequate welding condition.