Abstract
A dross transportation conveyor includes a group of transportation plates, a first temperature rise restraining surface, and a second temperature rise restraining surface. The transportation plates include a first transportation plate and a second transportation plate. The first transportation plate extends in a first direction. The second transportation plate is disposed to be adjacent to the first transportation plate and extends in the first direction. The transportation plates transport dross generated by irradiation of a laser beam on a workpiece. The first temperature rise restraining surface covers at least a part of the first transportation plate to restrain a temperature rise of the first transportation plate due to energy of the laser beam. The second temperature rise restraining surface covers at least a part of the second transportation plate to restrain a temperature rise of the second transportation plate due to the energy of the laser beam.