(a) Microstructure (b) X-ray image analysis of Al Fig. 5 SEM and EDX images of compound layer Table Ⅰ Quantitative analysis of elements (at %) 1 2 3 4 5 Al 2.7 99.7 79.0 78.8 72.8 Cr 19.3 0.0 4.4 4.4 5.4 Fe 69,9 0.3 15.1 15.3 19.7 Ni 8.1 0.0 1.5 1.5 2.1 300 280 260 240 220 0 10 20 30 40 Impact velocity V m/s Max. thickness of compound layer w mµ Fig. 6 Maximum thickness of compound layer plotted against impact velocity 300 280 260 240 220 0 20 40 60 80 100 Impact velocity V m/s Concentration C at% Fig.7 Effect of impact velocity on concentration of Al in compound layer results for the bar [1]. A mechanical mixing model has been proposed previously by Date for interpreting the formation mechanism of the compound layer by impact welding [3]. The model consists of mixing and solidification of the melting metals. It is deduced from the results obtained using the model that the high content of aluminum in the layer shows much lower heat generation on the impact face than that of explosive welding.
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