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首页> 外文期刊>ISIJ international >Weldability of High Strength Aluminum Alloys by Friction Stir Welding
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Weldability of High Strength Aluminum Alloys by Friction Stir Welding

机译：搅拌摩擦焊接高强度铝合金的焊接性能

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摘要

The effects of welding conditions, tool rotation speed, Rt and plate traveling speed, V on weld joints formation and mechanical properties have been investigated on Friction Stir Welding joints of high strength aluminum alloys of 2024-T6 and 7075-T6 in comparison with 5083-O of 4 mm thick plates. Rt/V, Welding parameter, which is closely related to welding heat input per unit length of the welded joint affected joint qualities. Peak temperature of FSW joints near stir zone during welding increased with increasing Rt/V, but lower than solidus temperature for each alloy. As weld defects lack of bonding and inner defect occurred at low Rt/V for each alloy, and excess high Rt/V caused surface tearing as defect both for 2024-T6 and 7075T6. As to a range of optimum welding condition, 5083-O was wider than those of 2024-T6 and 7075-T6, and optimum Rt/V range common to three alloys was 3.3 to 5.0. In case of any aluminum alloy, tensile strength of the welded joints increased with increasing Rt/V, and weld defects caused low tensile strength. The maximum tensile strengths for 2024-T6, 7075-T6 and 5083-O were 373, 444 and 296 MPa in as-welded condition, which were almost 76, 83 and 100 to base metal strength. Post-weld artificial aging increased the tensile strength of 7075-T6 joint to 512 MPa, 90 to base metal strength, but in 2024-T6 decreased it slightly.
机译：在2024-T6和7075-T6高强度铝合金的摩擦搅拌焊接接头上与5083-比较，研究了焊接条件，工具转速，Rt和板移动速度，V对焊接接头形成和力学性能的影响。 O为4毫米厚的板。 Rt / V，焊接参数，与焊接接头每单位长度的焊接热量输入密切相关，影响焊接接头的质量。焊接过程中靠近搅拌区的FSW接头的峰值温度随Rt / V的增加而增加，但低于每种合金的固相线温度。由于每种合金的焊缝缺陷都在低Rt / V时发生粘结不足和内部缺陷，而过高的Rt / V则导致表面撕裂作为2024-T6和7075T6的缺陷。关于最佳焊接条件的范围，5083-O比2024-T6和7075-T6的宽，并且三种合金共有的最佳Rt / V范围为3.3至5.0。在任何铝合金的情况下，焊接接头的抗拉强度会随着Rt / V的增加而增加，并且焊接缺陷会导致抗拉强度降低。 2024-T6、7075-T6和5083-O在焊接条件下的最大抗拉强度分别为373、444和296 MPa，相对于母材的强度几乎为76、83和100。焊接后的人工时效将7075-T6接头的抗拉强度提高到512 MPa，对母材的抗拉强度提高了90，但在2024-T6中则略有降低。

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