Study on Properties of 2A12-T4/7A09-T6 Aluminum Alloy Refill Friction Stir Spot Welding Joint

FANG Yuanfang; ZHANG Lina; LU Yunpeng; ZHANG Zhongping; ZHU He

doi:10.7512/j.issn.1001-2303.2023.03.15

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Study on Properties of 2A12-T4/7A09-T6 Aluminum Alloy Refill Friction Stir Spot Welding Joint
Vol. 53, Issue 3, Pages: 124-129(2023)
DOI： 10.7512/j.issn.1001-2303.2023.03.15

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方远方，张丽娜，陆云鹏，等.2A12-T4/7A09-T6铝合金回填式搅拌摩擦点焊接头性能研究［J］.电焊机，2023，53（3）：124-129.

FANG Yuanfang, ZHANG Lina, LU Yunpeng, et al.Study on Properties of 2A12-T4/7A09-T6 Aluminum Alloy Refill Friction Stir Spot Welding Joint[J].Electric Welding Machine, 2023, 53(3): 124-129.
方远方，张丽娜，陆云鹏，等.2A12-T4/7A09-T6铝合金回填式搅拌摩擦点焊接头性能研究［J］.电焊机，2023，53（3）：124-129. DOI： 10.7512/j.issn.1001-2303.2023.03.15.

FANG Yuanfang, ZHANG Lina, LU Yunpeng, et al.Study on Properties of 2A12-T4/7A09-T6 Aluminum Alloy Refill Friction Stir Spot Welding Joint[J].Electric Welding Machine, 2023, 53(3): 124-129. DOI： 10.7512/j.issn.1001-2303.2023.03.15.

摘要

采用机器人搅拌摩擦点焊设备对1.2 mm厚2A12-T4铝合金与4 mm厚7A09-T6铝合金板材进行回填式搅拌摩擦点焊试验，并对焊后试样进行X光检测、力学抗拉力检测，对焊点内部组织进行光学显微镜、扫描电镜观测。试验结果表明：当下扎/回填速率为30 mm/min时，试样抗拉力较低，当下扎/回填速率为40 mm/min、50 mm/min时，试样抗拉伸力较高，且随转速升高的变化趋势相近，试样最高抗拉力出现在转速2 100 r/min、速率40 mm/min时；焊点外缘结合区是材料结合最薄弱区域，若该区域表面出现缺陷，则焊点力学性能较差，该区域表面平整，则焊点力学性能高；试样断裂方式均为薄板一侧出现“穿孔”，焊点完整留在厚板一侧，断口断裂机制为韧性断裂、晶间滑移与脆性断裂相互作用的混合断裂。

Abstract

The lap welding of 1.2 mm 2A12 and 4.0 mm 7A09 aluminum alloys were carried out throgh refill friction stir spot welding technology by robot friction stir spot welding system. Specimen were field X-ray fluorescence exploration，subjected to tensile testing and observed by metallographic and scanning electron microscopy. The results showed that tensile force of joint was low when the welding speed was 30 mm/min. When the compaction/refilling rate increases to 40 mm/min and 50 mm/min, the tensile strength of the sample is relatively large, and the trend of change is similar with the increase of the rotational speed. The highest mechanical properties of the sample occur at the rotational speed of 2 100 r/min and the speed of 40 mm/min; The bonding area at the outer edge of a solder joint is the weakest area for material bonding. If there are defects on the surface of this area, the mechanical properties of the solder joint are poor. If the surface of this area is flat, the mechanical properties of the solder joint are high; the fracture mode of the sample is "perforation" on one side of the thin plate, and the solder joint remains intact on the side of the thick plate. The fracture mechanism is a mixed fracture of ductile fracture, intergranular slip, brittle displacement, and brittle fracture.

关键词

搅拌摩擦点焊2A12铝合金7A09铝合金力学性能

Keywords

friction stir spot welded2A12 aluminum alloys7A09 aluminum alloysmechanical property

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