Problem $1$

It takes $3021$ J to melt the amount of metal of a weld bead with a cross$-$sectional area of $4\mathrm{.}5m{m}^2$ and $150\mathrm{.}0$ mm long. $($a$)$ Using Table $25\mathrm{.}2,$ what is the most likely metal? $($b$)$ If the heat transfer factor is $0\mathrm{.}82$ and the melting factor is $0\mathrm{.}63$ for the welding process, how much heat must be generated at the welding source to accomplish the weld?