| Summary: | 碩士 === 國立臺灣師範大學 === 工業教育研究所 === 82 === In order to explore the best brazing parameter, torch brazing is used to braze the wrough aluminum alloy plates of 1 100 and 6061(T6) by using filler metals of BAlSi-4 and TA1OO in the type of lap joint. The joint shear strength was compared through the tensile test. Further more, the change of microstructure was examined by optical microscope and micro hardness test.
The result showed that there is no different between the joint shear strength using the filler metals BAlSi-4 and TA1OO for 1100 aluminum alloy. For the wrough 6061 (T6) aluminum alloy plates, the joint shear strength of brazing filler metal TA 100 is higher than filler metal BAlSi-4.
There are reduction in the strength and hardness of base metal for bath 1100 or 6061 (T6) wrough aluminum alloy plates. Because the wrough 1100 aluminum alloy plate is strengthened by cold working, brazing heat caused recrystallization and increase in grain size. The decrease of mechanical properies of wrough 6061 (T6) aluminum alloy plate was obtained by heat treatment during brazing.
In addition, there is diffusion of Silicon in the weidment of wrough 1100 aluminum alloy plates and promote the increase of hardness of base metal. But no diffusion was observed in 6061 (T6) aluminum alloy.
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