Question

A 90 mm long sheet is to be welded with MIG welding process. The heat input required per unit length is 10 J/mm. The heat transfer and melting efficiencies are 0.8 and 0.6; respectively. The electrical energy consumption in kJ is _____

• A. 2.225
• B. 1.5
• C. 1.875
• D. 1

Answer 1

The correct option is C 1.875

$\frac{H}{l}=10J/mm$

$H=10\times 90=900J$

Electrical energy required is

$\frac{900}{0.8\times 0.6}=1875J=1.875kJ$