Question

A plate of 1 m length is welded at a speed of 100mm/min with an arc welding power source at an duty cycle of 60% with a current of 150A at 30V. Assuming welding efficiency to be 80%, the heat input to the weldment (in kJ) is______

• A. 1000
• B. 998
• C. 1136
• D. 1296

Answer 1

The correct option is D 1296

$\frac{H}{\ell }=\frac{\eta \text{DVI}}{\text{Welding speed}}=\frac{0.8\times 0.6\times 150\times 30}{\left(\frac{100}{60}\right)}$

=1296 J/mm

$\text{Heat input}=1296\times 1000=1296\text{kJ}$