5052-H32鋁合金電阻點銲拉剪強度之韋伯可靠度分析

[[abstract]]5052-H32 aluminum alloys, with the effects of resisting weather and its proper intensity, has the advantage of applying to the outside plate of cars. Besides, due to the prosperous development of 3C(computer, communication, consumptive electronic product) in Taiwan, 5052-H32 aluminum alloys have the qualities of light weight, proper intensity, not affecting communication and not conducting magnetic, so it is noticed in the applicative field. 5052-H32 aluminum alloys, used in the research, is aluminum- magnesium alloys. Through processing hardness and steady treatment, its intensity is medium, matching the AC spot welding machine . In the best welding parameter, by the test of tensile-sheer strength ,we studied the rang of tensile-sheer strength, and then by analyzing reliability , we discussed the reliability of welding parameter. After studying, we discovered that the best welding parameter of 1.0mm’s 5052-H32 aluminum alloy is 17.1KA welding current, 130kgf electrode force, 13cycles, 17cycles, 21cycles holding time. In addition, from the micro-structure of nugget and the test of micro-hardness, the structure around nugget is divided into base material, heat-affected zone(HAZ) and re-melted zone. The micro-hardness value of base material is the largest, the micro-hardness value of re-melted zone is the second, and the micro-hardness value of HAZ is the smallest. The Weibull modulus, m, of the welding plate which is used to test the intensity of tensile-shear strength is between 2.45 and 10.96. Under all conditions, Weibull modulus, m, is over 1 and it’s wear-out mode destruction, which proves that it is practical to use 50KVA AC spot welding machine to welded 5052-H32 aluminum alloys.