Friction stir welding technology and joint properties of T2 cooper

WANG Zhiguo; FENG Xiaosong; YIN Yuhuan; DOU Chao; WU Wenchao

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Friction stir welding technology and joint properties of T2 cooper
Vol. 49, Issue 3, Pages: 1-5(2019)
Published：2019
DOI：
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DOI：

WANG Zhiguo, FENG Xiaosong, YIN Yuhuan, et al. Friction stir welding technology and joint properties of T2 cooper[J]. Eletric Welding Machine2019, 49(3): 1-5. DOI：

摘要

以10 mm厚T2紫铜为研究对象开展搅拌摩擦焊工艺试验。结果表明

在一定参数范围内

可获得表面成形良好、无内部缺陷的优质接头。接头的宏观截貌由焊核区、热影响区和母材组成

未观察到热机影响区。其中焊核区发生明显的动态再结晶

获得细小等轴晶组织

热影响区晶粒有所长大。接头的显微硬度分布呈"W"形

焊核区和热影响区的硬度值均低于母材

热影响区的硬度值最低

焊核区硬度比较稳定。当转速为400 r/min、焊速为100 mm/min时

接头抗拉强度达到母材的97%。不同参数下接头的断裂位置均位于后退侧热影响区。

Abstract

Friction stir welding of 10 mm T2 cooper with different process parameters were studied in this paper. The results showed that the defect-free sound joints with good surface forming can be achieved with in certain ranges of process parameters. The weld cross-section consists of weld nugget zone

heat affect zone and base metal

the thermo-mechanically affected zone was not found.Significant dynamic recrystallization occurred in the weld nugget zone and fine equiaxed crystal structures were obtained. The grain size in heat affect zone increased a little. The distribution of microhardness at cross-section was "W" shape. the microhardness values of stir zone and heat affected zone were lower than base metal the lowest microhardness occurred in heat affect zone

the microhardness in weld nugget zone were relative stable. The tensile strength of the joint reached 97% of the base metal

when the rotation speed was 400 r/min and the welding speed was 100 mm/min. The fracture positions of joints under different parameters were at the retreating side of the heat affected zone.