Statistical analysis in tensile strength characteristics of friction welded joints of 1050, 2017, 6061 aluminum alloy to SUS304 stainless steel

The tensile strength characteristics of friction welded joints of several aluminum alloys (A1050, A2017, A6061) to stainless steel (SUS304) were investigated by statistical analysis such as normal distribution and Weibull distribution. The results are as follows. The joint efficiencies of joints obtained under an optimum welding condition followed by a good joint showed near normal distribution with higher mean value and small dispertion, and furthermore showed a Weibull distribution with large shape parameter and small coefficient of variance. On the other hand, the joint efficiencies of joints obtained under the unsuitable welding condition followed by a poor joint showed a plus or minus distortional distribution with large dispertion and showed a Weibull distribution with small shape parameter and large coefficient of variance. Thus, the optimum welding condition could be obtained in the case of A1050 to SUS304 and A6061 to SUS304, but couldn't be obtained in the case of A2017 to SUS304 in this experiment.