Steel plates are welded autogenously using Gas Tungsten Arc welding with an

arc heat transfer efficiency of $0\mathrm{.}65.$ The first weld is made using a welding

current of $200$ A at an arc voltage of $18$ V with a welding speed of $0\mathrm{.}002$ m$$s

$$

$.$

The second weld is made at a welding speed of $0\mathrm{.}0022$ m$$s

$$ with the same arc

voltage. If both the welds have identical heat input, the welding current of the

second weld is