PSI- Issue 9

Mohammad Jameel Zedan et al. / Procedia Structural Integrity 9 (2018) 37–46 Mohammad Jameel Zedan, et al. / Structural Integrity Procedia 00 (2018) 000–000

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Figure 12 shows the Energy Dispersive X-ray Spectroscopy (EDX). Readings over IMC layer near the aluminum side and steel side were taken; see Fig. 12a, and b, respectively. The spots of EDX test for the IMC band showed that Fe increases toward the steel plate with decreasing of aluminum. In the opposite direction toward aluminum, Fe decreases with increasing of Al.

Fig. 12. Green spots of (EDX) test (a) near the aluminum side; (b) near the steel side.

Table 4. EDX analysis results of IMC in points A and B. Element Series C (wt%)

C (wt%)

C (wt.%)

Error (1sigma) (wt%)

A

Iron

k- Series k- Series

8.97

11.43 88.57 100% 29.62 70.38 100%

5.87

0.9 3.5

Aluminium

69.56 78.53 25.16 59.78 84.94

94.13 100%

Total

B

Iron

k- Series k- Series

16.9 83.1

1.27 2.93

Aluminium

Total

100%

4. Conclusions For the dissimilar RSW of steel and aluminum, the optimum welds have been obtained using the current technique. Otherwise, these metals suffer the poor weldability due to their mechanical and physical properties like thermal expansions. The tensile strength values are increased by increasing the welding parameters such as electrode force, welding current, and the welding time. The optimum parameters 2400 N electrode force, 14.25 KA weld current, and 40 cycles weld time have been determined that give the optimum weld strength equal to 3210 N. These values give the largest weld nugget diameter equal to 9.75 mm. The nugget diameters are increased by increasing the electrode