calculate heat input per unit length and cross-sectional area of weld bead

Question

A weld is made using MIG welding process with the following welding parameters; Current: 200A: Voltage: 25V; Welding speed: 18 cm/min; wire diameter; 1.2 mm; Wire feed rate: 4m/min; Thermal efficiency of the process: 65%

1. The heat input per unit length of the weld in kJ/cm is:

(a) 0.18                               (b) 0.28

(c) 10.83                             (d) 16.66

 

2.The area of cross section of weld bead in mm² is:

(a) 16.3                              (b) 25.1

(c) 30.3                              (d) 38.6