Effect of welding parameters on microstructures and properties of Mg-3Zn-0.5Y alloy joint by FSW

LV Jiangang; Chen Xi; Zhang Lei

doi:10.7512/j.issn.1001-2303.2020.10.05

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Effect of welding parameters on microstructures and properties of Mg-3Zn-0.5Y alloy joint by FSW
Vol. 50, Issue 10, Pages: 22-28(2020)
Published：2020
DOI： 10.7512/j.issn.1001-2303.2020.10.05
稿件说明：

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DOI：

LV Jiangang, Chen Xi, Zhang Lei. Effect of welding parameters on microstructures and properties of Mg-3Zn-0.5Y alloy joint by FSW[J]. Eletric Welding Machine2020, 50(10): 22-28. DOI： 10.7512/j.issn.1001-2303.2020.10.05.

摘要

采用搅拌摩擦焊对Mg-3Zn-0.5Y合金板材进行焊接

获得了成型较好、无缺陷的焊缝

研究了工艺参数对焊接接头显微组织及力学性能的影响。结果表明

当焊速为110 mm/min时

转速在600～1 300 r/min范围内能够得到成型良好的焊缝

随着转速的升高

接头强度先升高后减小;当搅拌头旋转电机转速为1 100 r/min时

焊接速度在90～110 mm/min范围内能够获得成型良好的焊缝

随着焊接速度的提高

接头强度先提高后减小。拉伸断裂方式主要为韧脆混合断裂。当搅拌头旋转运动速度为1 100 r/min、焊速为110 mm/min时

Mg-3Zn-0.5Y合金焊缝综合力学性能较优

拉伸强度达到222.5 MPa。

Abstract

In this paper

the Mg-3Zn-0.5Y alloy weld in good shape and defect-free was produced by friction stir welding

and the influence of welding parameters on the microstructure and mechanical properties of the welded joint was studied. As a result

when the welding speed is 110 mm/min

the well-formed weldcan be obtained with the rotation rate at 600 ～1300 r/min. The tensile properties of the joints first increase and then decrease in the range. When the rotational speed of 1 100 r/min

the well-formed weld can be obtained with the rotation rate at 90～1 300 mm/min. With the increase of rotating speed

the joint strength increases first and then decreases. Brittle fracture and ductile fracture can be observed simultaneously. Good comprehensive mechanical properties can be obtained when the rotation rate was 1 100 r/min and the welding speed was 110 mm/min

the tensile strength was 222.5 MPa

the yield strength was 173.8 MPa.