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首页> 外文期刊>Journal of Materials Engineering and Performance >Experimental Study of Stationary Shoulder Friction Stir Welded 7N01-T4 Aluminum Alloy
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Experimental Study of Stationary Shoulder Friction Stir Welded 7N01-T4 Aluminum Alloy

机译：固定肩摩擦搅拌焊接7N01-T4铝合金的实验研究

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摘要

Stationary shoulder friction stir welding (SSFSW) was successfully used to weld 7N01-T4 aluminum alloy with the thickness of 4 mm. Effects of welding speed on formations, microstructures, and mechanical properties of SSFSW joint were investigated in detail. Under a constant rotational velocity of 2000 rpm, defect-free joints with smooth surface and small flashes are attained using welding speeds of 20 and 30 mm/min. Macrostructure of nugget zone in cross section presents kettle shape. For 7N01-T4 aluminum alloy with low thermal conductivity, decreasing welding speed is beneficial to surface formation of joint. With the increase of welding speed, mechanical properties of joints firstly increase and then decrease. When the welding speed is 30 mm/min, the tensile strength and elongation of joint reach the maximum values of 379 MPa and 7.9%, equivalent to 84.2 and 52% of base material, respectively. Fracture surface morphology exhibits typical ductile fracture. In addition, the minimum hardness value of joint appears in the heat affected zone.
机译：固定肩部摩擦搅拌焊（SSFSW）成功用于焊接厚度为4 mm的7N01-T4铝合金。详细研究了焊接速度对SSFSW接头的组织，组织和力学性能的影响。在2000 rpm的恒定转速下，使用20和30 mm / min的焊接速度可获得具有平滑表面和小飞边的无缺陷接头。横截面中的熔核区的宏观结构呈现釜形。对于导热系数低的7N01-T4铝合金，降低焊接速度有利于接头的表面形成。随着焊接速度的提高，接头的力学性能先增大后减小。当焊接速度为30 mm / min时，接头的抗拉强度和伸长率分别达到379 MPa和7.9％的最大值，分别相当于基础材料的84.2和52％。断裂表面形态表现出典型的韧性断裂。此外，接头的最小硬度值出现在热影响区。

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