6063-T6铝合金双轴肩搅拌摩擦焊接头组织及力学性能分析

王春桂,赵运强,董春林,邓军

doi:10.12073/j.hjxb.2018390258

6063-T6铝合金双轴肩搅拌摩擦焊接头组织及力学性能分析

王春桂,赵运强,董春林,邓军

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- 收稿日期: 2018-03-26

Analysis on microstructure and mechanical properties of 6063-T6 self-reacting friction stir welding

WANG Chungui, ZHAO Yunqiang, DONG Chunlin, DENG Jun

摘要

摘要: 对4 mm厚6063-T6铝合金进行了双轴肩搅拌摩擦焊接试验. 结果表明，双轴肩搅拌摩擦焊可以实现6063-T6铝合金的焊接，得到表面成形良好且内部无缺陷的接头. 接头宏观形貌为哑铃状，其微观形貌分为焊核区、热力影响区、热影响区及母材区. 在搅拌头转速为1 200 r/min，焊接速度为400~700 mm/min的工艺区间内，接头强度呈先升高后降低的趋势，最高可达181.64 MPa，为母材的68.5%，硬度分布呈W状分布，接头断裂位置位于前进侧热影响区，断裂方式为韧性断裂.
- 双轴肩搅拌摩擦焊|微观组织|力学性能|焊接热循环
Abstract: Self-reacting friction stir welding experiments for 4 mm thick 6063-T6 aluminum alloy were carried out in this study. The results indicated that good surface appearance and inner defect-free joints could be obtained. The joint macro morphologies were dumbbell shaped and the joint could be divided into four microstructure zones i.e. base material zone, heat affecting zone, thermal-mechanical affect zone and weld nugget zone. The hardness distribution of all the joints were W-shaped. When the rotation speed was 1 200 r/min and the welding speeds were 400~700 mm/min, the tensile strength of the joint first increased and then decreased. The tensile strength of the optimized joint was 181.64 MPa which equaled 68.5% of that of the base material. All the failed joints fractured in the heat-affected zone at the forward side with a ductile fracture mode.
- self-reacting friction stir welding|microstructure|mechanical property|welding thermal cycle

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参考文献(8)

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6063-T6铝合金双轴肩搅拌摩擦焊接头组织及力学性能分析

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Analysis on microstructure and mechanical properties of 6063-T6 self-reacting friction stir welding

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