黄清,龙腾飞,王金锴,等.焊接速度对7075-T6铝合金薄板μFSW接头组织及力学性能的影响[J].精密成形工程,2025,17(5):50-56.
HUANG Qing,LONG Tengfei,WANG Jinkai,et al.Effect of Welding Speed on Microstructure and Mechanical Properties of Micro Friction Stir Welding (μFSW) 7075-T6 Aluminium Alloy Sheet Joints[J].Journal of Netshape Forming Engineering,2025,17(5):50-56. |
| 焊接速度对7075-T6铝合金薄板μFSW接头组织及力学性能的影响 |
| Effect of Welding Speed on Microstructure and Mechanical Properties of Micro Friction Stir Welding (μFSW) 7075-T6 Aluminium Alloy Sheet Joints |
| 投稿时间：2024-07-23 |
| DOI：10.3969/j.issn.1674-6457.2025.05.006 |
| 中文关键词: 7075-T6铝合金薄板 微搅拌摩擦焊 接头成形 显微组织 力学性能 |
| 英文关键词: 7075-T6 aluminium alloy sheets μFSW joint formation microstructure mechanical properties |
| 基金项目:国家自然科学基金(52164045，52465044，52005240);江西省杰出青年基金(20224ACB214012);江西省主要学科学术和技术带头人项目(20212BCJ23028) |
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| 摘要点击次数: 64 |
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| 中文摘要: |
| 目的 针对微搅拌摩擦焊在高焊速条件下难以控制待焊板材变形的问题，通过适当降低焊接速度来研究其对接头成形、显微组织及力学性能的影响。方法 选用微搅拌摩擦焊(μFSW)方法并使用无针式搅拌头，对0.5 mm厚7075-T6铝合金进行焊接试验，研究不同焊速条件下接头的焊缝成形、微观组织、力学性能及断裂行为。结果 采用无针式搅拌头，在47.5 mm/min低焊接速度的工艺参数下实现了超薄7075-T6铝合金板材的有效冶金连接，焊缝表面成形良好，未见明显缺陷，所获得的接头抗拉强度达404.16 MPa。然而，随着焊接速度的提高，μFSW接头成形受焊接热输入影响变大。当采用75 mm/min的焊接速度进行焊接时，由于焊接热输入降低，焊缝中心底部有未焊透缺陷产生，在接头拉伸过程中，未焊透区域优先发生断裂，因此接头的受力承载面积降低，抗拉强度下降。继续增加焊接速度至118 mm/min，未焊透缺陷延伸至焊核区中心位置，进一步降低了接头的有效受力承载面积，大幅降低了接头的力学性能。结论 不同的焊接速度对7075-T6铝合金μFSW接头的组织及性能产生了不同的影响，焊接速度越高，焊接热输入越低，焊缝底部未焊透缺陷越明显，未焊透缺陷的产生不利于提高接头的成形质量。 |
| 英文摘要: |
| The work aims to study the effect of micro friction stir welding (μFSW) on the forming, microstructure and mechanical properties of the joint so as to solve the problem that it is difficult to control the deformation of the sheet under the condition of high welding speed. The μFSW technique was used to weld 0.5 mm thick 7075-T6 aluminium alloy sheet with the pinless tool. The weld formation, microstructure, mechanical properties and fracture behavior of the joint at different welding speed were studied. With the pinless tool, the effective metallurgical bonding of ultra-thin 7075-T6 aluminium alloy sheet was achieved at a welding speed of 47.5 mm/min under the process parameters, with good formation of the weld and no obvious defects. The tensile strength of the joint obtained was 404.16 MPa. However, the formation of the μFSW joint was significantly affected by the welding heat input as the welding speed increased gradually. When welding was conducted at a speed of 75 mm/min, due to the reduction of welding heat input, there was a defect of a lack of root penetration in the center of the joint. During the tensile test of the joint, the lack of root penetration area prioritized the fracture, resulting in a reduction of the effective bearing area of the joint and a decrease in tensile strength. When the welding speed increased to 118 mm/min, the lack of root penetration extended to the center of the stir zone, further reducing the effective bearing area of the joint and significantly reducing the mechanical properties of the joint. The microstructure and properties of μFSW joint of 7075-T6 aluminium alloy are apparently affected by different welding speed. However, when the welding speed is higher, the welding heat input is lower, so that the lack of root penetration at the bottom of the weld is more obvious. Therefore, the occurrence of lack of root penetration is not conducive to improving the forming quality of the joint. |
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