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首页> 外文期刊>Journal of Manufacturing Processes >Prospects of laser beam welding and friction stir welding processes for aluminum airframe structural applications
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Prospects of laser beam welding and friction stir welding processes for aluminum airframe structural applications

机译：铝机身结构应用激光束焊接和搅拌摩擦焊接工艺的前景

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The present study deals with laser beam welding (LBW) and friction stir welding (FSW) applied to high-strength aluminum alloys used in aircraft industry and displays their advantages compared with the riveting technique regarding structural integrity, weight and material savings. First of all, it is shown with respect to different applications and strength levels which high-strength aluminum alloys represent the state-of-the-art and which aluminum alloys are proposed as substitutes in the future. Furthermore, the respective joining process principles are described and demonstrated on different joint configurations, whereby mechanical and microstructural properties of laser beam- and friction-stir-welded joints are discussed and compared. The current study clearly demonstrates that these two joining techniques are not competing but complementary joining techniques in the aircraft industry.FSW, as a solid-state joining process, has the advantage that the joining is conducted at temperatures below the melting point of the materials to be joined. Therefore, improved mechanical performance of joints is expected compared to that of fusion joining processes such as LBW. Furthermore, better mechanical properties can be obtained when heat input during joining is reduced by employing stationary shoulder FSW and/or external cooling. On the other hand, LBW offers several advantages such as low distortion, high strength of the joint, and high welding speeds due to its low localized-energy input. Thus, LBW - as a high-speed and easily controllable process - allows the welding of optimized complex geometrical forms in terms of mechanical stiffness, strength, production velocity, and visual quality. Both joining processes have advantages and disadvantages, depending on joint geometries and materials. They both have the potential to reduce the total weight of the structure. The FSW process (particularly lower heat input stationary shoulder FSW process) is more advantageous in producing long-distance straight-line butt joints or overlapped joints of aircraft structures, whereas the high-speed and easily controllable LBW process allows the joining of complex geometrical forms due to its high flexibility, particularly in the new generation high strength Al-alloys (such as AA2198), the strengthening phases of which are more heat resistant.
机译：本研究涉及应用于飞机行业的高强度铝合金的激光束焊接（LBW）和摩擦搅拌焊接（FSW），并显示出与铆接技术相比在结构完整性，重量和材料节省方面的优势。首先，针对不同的应用和强度水平，显示了哪些高强度铝合金代表了最新技术水平，以及将来提出了哪些铝合金替代品。此外，在不同的接头构造上描述并展示了各自的焊接工艺原理，从而讨论并比较了激光束和摩擦搅拌焊接接头的机械和微观结构特性。当前的研究清楚地表明，这两种连接技术不是航空工业中的竞争而是互补的连接技术.FSW作为固态连接工艺，具有以下优点：在低于材料熔点的温度下进行连接被加入。因此，与诸如LBW之类的熔接工艺相比，期望改善接头的机械性能。此外，当通过采用固定式胎肩FSW和/或外部冷却来减少接合过程中的热量输入时，可以获得更好的机械性能。另一方面，LBW由于具有较低的局部能量输入而具有许多优点，例如变形小，接头强度高以及焊接速度快。因此，LBW作为一种高速且易于控制的过程，可以在机械刚度，强度，生产速度和视觉质量方面焊接优化的复杂几何形状。两种连接方法都有其优缺点，这取决于连接的几何形状和材料。它们都有降低结构总重量的潜力。 FSW工艺（尤其是较低热量输入的固定肩部FSW工艺）在生产飞机结构的长距离直线对接接头或重叠接头方面更具优势，而高速且易于控制的LBW工艺允许连接复杂的几何形状由于其高柔韧性，特别是在新一代高强度铝合金（例如AA2198）中，其强化阶段具有更高的耐热性。

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