论文部分内容阅读
研究了板厚为6mm的AZ31镁合金搅拌摩擦焊工艺,并对接头的断裂机制进行了考查。在转速为1000r/min,焊接速度为60～300mm/min条件下获得表面平整,无缺陷的焊缝。与母材相比,搅拌区的晶粒得到明显细化。随焊接速度增加,搅拌区的晶粒尺寸减小。搅拌区的硬度高于其他区域。焊接速度为150mm/min时,接头拉伸强度最高,达到母材的92.7%。断裂多发生在热影响区,热影响区晶粒粗大且分布不均,显微硬度最低,是焊接接头的薄弱环节。
The friction stir welding process of AZ31 magnesium alloy with a thickness of 6mm was studied, and the fracture mechanism of the joint was investigated. In the speed of 1000r / min, the welding speed of 60 ~ 300mm / min conditions were smooth surface, no defects in the weld. Compared with the base metal, the stirring zone of the grain was significantly refined. As the welding speed increases, the grain size of the stir zone decreases. Stirring zone hardness higher than other regions. When the welding speed is 150mm / min, the joint tensile strength is the highest, reaching 92.7% of the base metal. Fracture occurred in the heat affected zone, heat affected zone coarse grains and uneven distribution, the lowest microhardness, is the weakest link in the weld.