Question

In an arc welding process, welding speed is doubled. Assuming all other process parameters to be constant, the cross sectional area of the weld bead will

• A. $\text{reduce by}50\text{\%}$
• B. $\text{reduce by}25\text{\%}$
• C. $\text{increase by}50\text{\%}$
• D. $\text{increase by}25\text{\%}$

Answer 1

The correct option is B $\text{reduce by}25\text{\%}$

$H_s=\frac{VI}{v{A}_b}$

$\text{If}v\text{is double}\left(2v\right)\text{to make}{H}_s\text{constant}$

$A_b\text{will be reduced by}50\text{\%.}$

$H_s=\frac{VI}{2v\frac{A_b}{2}}=\frac{VI}{v{A}_b}$