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首页> 外文期刊>Journal of Manufacturing Processes >The influence of process parameters on mechanical properties and corrosion behavior of friction stir welded aluminum joints
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The influence of process parameters on mechanical properties and corrosion behavior of friction stir welded aluminum joints

机译：工艺参数对搅拌摩擦焊接铝接头力学性能和腐蚀行为的影响

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Aim of the present paper is to analyze if and how the process parameters (namely rotational speed S and feed rate f) affect both the mechanical properties and the corrosion behavior of friction stir welded (FSWed) butt joints made of AA7075 and AA2024 alloys and their combination. Tensile tests were performed orthogonally to the welding direction on specimens having the welding nugget placed in the middle of gage length. Rockwell tests were carried out on each specimen moving from the joint axis until the hardness of the base material was reached. A clear dependence of the Ultimate Tensile Strength (UTS) from the process parameters were observed when the joints are obtained using the same material while the effect is not so evident when two different materials are concerned. In almost all cases, the best conditions, in terms of mechanical resistance, were obtained for intermediate values of rotational speed and feed rate. Further tests were performed for evaluating the corrosion behavior and the stress corrosion cracking susceptibility of FSWed joints. In particular, local corrosion potential measurements were executed and longtime immersion tests were carried on four points bending specimens loaded up to 80% of the Yield Strength (TYS), in 35 g/L sodium chloride solution. The same tests were replicated on unloaded specimens. The potential trends are always well defined and much higher for the AA2024 alloy, since it is more noble than the AA7075 alloy. Mixed welding allows to identify the AA7075 alloy as an anode part, having a lower copper concentration and a high concentration of zinc. A correlation of some corrosion behaviors to the mechanical characteristics was evidenced, in particular for the AA2024 alloy.
机译：本文的目的是分析工艺参数（即转速S和进给速度f）是否以及如何影响由AA7075和AA2024合金制成的搅拌摩擦焊接（FSWed）对接接头的机械性能和腐蚀行为组合。垂直于焊接方向进行拉伸测试，测试样品的焊接块位于标距长度的中间。对从接合点轴移动的每个样品进行洛氏试验，直到达到基材的硬度为止。当使用相同的材​​料获得接头时，观察到极限抗拉强度（UTS）与工艺参数的明显依赖关系，而当涉及两种不同的材料时，效果却不是那么明显。在几乎所有情况下，就机械阻力而言，对于转速和进给速度的中间值都可获得最佳条件。进行了进一步的测试，以评估FSWed接头的腐蚀行为和应力腐蚀开裂敏感性。特别是，在35 g / L氯化钠溶液中，对局部腐蚀电位进行了测量，并在负荷高达80％屈服强度（TYS）的四点弯曲试样上进行了长时间的浸没测试。在卸载的样品上重复相同的测试。由于AA2024合金比AA7075合金更贵重，因此它的趋势一直很明确，而且更高。混合焊接可以将AA7075合金确定为阳极零件，具有较低的铜浓度和较高的锌浓度。证明了某些腐蚀行为与机械特性之间的相关性，特别是对于AA2024合金而言。

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