张继元,毛育青,王金锴,等.旋转速度对铝合金锁底结构搅拌摩擦焊接头成形及力学性能的影响[J].精密成形工程,2024,16(8):61-67.
ZHANG Jiyuan,MAO Yuqing,WANG Jinkai,et al.Influence of Rotation Speed on Microstructure and Mechanical Properties of Friction Stir Welded Aluminum Alloy Bottom Locking Structure Joints[J].Journal of Netshape Forming Engineering,2024,16(8):61-67. |
| 旋转速度对铝合金锁底结构搅拌摩擦焊接头成形及力学性能的影响 |
| Influence of Rotation Speed on Microstructure and Mechanical Properties of Friction Stir Welded Aluminum Alloy Bottom Locking Structure Joints |
| 投稿时间：2024-02-23 |
| DOI：10.3969/j.issn.1674-6457.2024.08.007 |
| 中文关键词: 锁底结构 搅拌摩擦焊 焊接缺陷 微观组织 力学性能 |
| 英文关键词: bottom locking structure friction stir welding welding defect microstructure mechanical properties |
| 基金项目:国家自然科学基金(52164045，52005240);江西省主要学科学术和技术带头人项目(20212BCJ23028);江西省杰出青年基金(20224ACB214012) |
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| 中文摘要: |
| 目的 针对密封性要求高的6082-T6铝合金特殊容器焊接接头强度低的问题，研究搅拌头旋转速度对锁底接头成形及力学性能的影响。方法 首先选用焊接速度为47.5 mm/min，搅拌针旋转速度分别为600、750、950 r/min的焊接工艺参数对6082-T6铝合金锁底结构进行搅拌摩擦焊接，分析不同旋转速度对锁底接头横截面形貌、显微组织及力学性能的影响。结果 锁底结构搅拌摩擦焊的焊缝区均存在未焊透和弱连接缺陷;随着旋转速度的提高，“S”线逐渐增多并且向前进侧方向偏移，未焊透缺陷尺寸逐渐增大;接头热影响区沉淀相的尺寸随着旋转速度的提高而增大，且分布更密集;提高旋转速度会造成接头拉伸性能逐渐降低;其中在旋转速度600 r/min下获得的接头抗拉强度达到母材的53%，而旋转速度为950 r/min时接头抗拉强度仅为母材的48%，并且在断口处发现了大量富Fe相沉淀颗粒物。结论 随着旋转速度的增大，热影响区所受焊接热循环的高温时间增长，冷却时间延长，含有富Fe的沉淀相明显可见且逐渐粗化变大，导致力学性能降低。试样断裂位置均沿接头底部未焊透区域开始断裂。 |
| 英文摘要: |
| The work aims to solve the problem of low joint strength for 6082-T6 aluminum alloy special containers with a high sealing requirement, and study the effects of rotation speed of used tools on the forming and mechanical properties of butt-lap joints. A welding speed of 47.5 mm/min with different rotating speeds including 600, 750, and 950 r/min was selected, and then friction stir welding was performed on 6082-T6 aluminum alloy bottom locking structures. The effects of different rotation speeds on cross sections, microstructure and mechanical properties of the butt-lap joints were analyzed. The results showed that there were incomplete penetration and kiss bonding defects in weld zones of the butt-lap joints. When the rotation speed increased, the "S" line gradually increased and moved toward the advancing side, and the size of incomplete penetration defect at the bottom of the butt-lap joint gradually increased. Moreover, the size of the reprecipitated phase particles in the HAZ increased and the distribution became more and more intensive with the increase of the rotation speed, and tensile properties of the butt-lap joints reduced gradually. At 600 r/min, the tensile strength of the butt-lap joint reached 53% of the base material, while it was only 48% at 950 r/min, and lots of Fe-rich reprecipitated phase particles were found on the fracture surface. With the increase of the rotation speed, the high temperature time of welding thermal cycle in the HAZ is increased and the cooling time is prolonged, the Fe-rich reprecipitate phase particles are obviously coarsened, and which can lead to the decrease of mechanical properties. The fracture positions of all tensile specimens fail along the incomplete penetration area at the bottom of the joint. |
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