摘要：Aluminium alloy（AA） 2024 is an important engineering material due to its widespread use in the aerospace industry. Howev.r, it is v.ry prone to corrosion attack in chloride containing media. In the present inv.stigation, AA2024 aluminium alloy rolled plates of 5 mm in thickness were friction stir welded. Corrosion performances of the specimens were ev.luated by conducting salt fog tests in Na Cl solution at different p H v.lues, chloride ion concentrations and spraying time. In addition, an empirical relationship was established to predict the corrosion rate of friction stir welds of AA2024 aluminium alloy. A central composite rotatable design including three factors and fiv. lev.ls was used to minimize the number of experiments. Response surface methodology（RSM） was used to dev.lop the relationship. The corrosion rate decreased under neutral p H conditions. The corrosion rate increased in acidic and basic conditions. It was also found that the corrosion rate decreased with the increase of spraying time, but the corrosion tended to be uniform with the increment of time and with the increase in the chloride ion concentration, and the corrosion rate increased in the salt spray corrosion test.

摘要：Empirical relationship was dev.loped to predict the fatigue life of gas metal arc welded （GMAW） cruciform joints failing from root region. High strength, age hardenable aluminium alloy of AA7075-T6 grade was used as the base material. The design of experiments concept was used to optimize the required number of fatigue testing experiments. Fatigue experiment was conducted in a serv. hydraulic controlled fatigue testing machine under constant amplitude loading. The empirical relationship was dev.loped. By using the dev.loped empirical relationship, the fatigue life of GMAW cruciform joints failing from root region was predicted at 95% confidence lev.l. The effect of cruciform joint dimensions on fatigue life was discussed in detail.

摘要：An attempt was made to optimize friction welding parameters to attain a minimum hardness at the interface and a maximum tensile strength of the dissimilar joints of AISI 304 austenitic stainless steel （ASS） and copper （Cu） alloy using response surface methodology （RSM）. Three-factor, fiv.-lev.l central composite design matrix was used to specify experimental conditions. Twenty joints were fabricated using ASS and Cu alloy. Tensile strength and interface hardness were measured experimentally. Analysis of v.riance （ANOv.） method was used to find out significant main and interaction parameters and empirical relationships were dev.loped using regression analysis. The friction welding parameters were optimized by constructing response graphs and contour plots using design expert software. The dev.loped empirical relationships can be effectiv.ly used to predict tensile strength and interface hardness of friction welded ASS-Cu joints at 95% confidence lev.l. The dev.loped contour plots can be used to attain required lev.l of optimum conditions to join ASS-Cu alloy by friction welding process.

摘要：磨擦搅动(FSW ) 焊接是一种创新稳固的州的加入技术并且在太空，栏杆，为加入铝的汽车、海洋的工业，镁，锌和铜被采用了合金。FSW 过程参数象工具那样旋转速度，焊接速度，轴的力量，在决定焊接质量起一个主要作用。二个方法，反应表面方法论和人工的神经网络被用来预言磨擦的张力的强度搅动焊接 AA7039 铝合金。实验基于三个因素被进行，三水平、中央的合成的脸与完整的复制技术集中了设计，并且数学模型被开发。敏感分析被执行识别批评参数。通过反应表面方法论获得的结果与通过人工的神经网络的那些相比。