For spot welding of two steel sheets (base metal) each of 3 mm thickness, welding current of 10000 A is applied for 0.2 s. The heat dissipated to the base metal is 1000 J. Assuming that the heat required for melting 1 mm volume of steel is 20 J and interfacial contact resistance between sheets is 0.0002 ohms, the volume (in mm ) of weld nugget is.

For spot welding of two steel sheets (base metal) each of 3 mm thickne

1.	For spot welding of two steel sheets (base metal) each of 3 mm thickness, welding current of 10000 A is applied for 0.2 s. The heat dissipated to the base metal is 1000 J. Assuming that the heat required for melting 1 mm volume of steel is 20 J and interfacial contact resistance between sheets is 0.0002 ohms, the volume (in mm ) of weld nugget is.
A.	180mm
B.	50mm
C.	150mm
D.	60mm
Answer» D. 60mm

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