Effect of Dwell Time on Fracture Load of Friction Stir Spot Welded Dissimilar Metal Joints

Table 4

Influence of dwell time on macrograph of FSSW dissimilar joints.

Dwell time (sec)	Cross-sectional macrograph	Observation
4		FL = 8.49 kN;
		HH = 2.16 mm;
		HW = 1.35 mm;
		HID = 2.11 mm;
5		FL = 8.81 kN;
		HH = 1.89 mm;
		HW = 1.38 mm;
		HID = 2.46 mm;
6		FL = 9.56 kN;
		HH = 0.78 mm;
		HW = 1.81 mm;
		HID = 2.75 mm;
7		FL = 9.28 kN;
		HH = 0.70 mm;
		HW = 1.78 mm;
		HID = 2.54 mm;
8		FL = 9.06 kN;
		HH = 0.65 mm;
		HW = 1.67 mm;
		HID = 2.02 mm;

FL, fracture load “kN”; HH, hook height; HW, hook width; HID, hook initiation distance “mm.”