Classification depends on the machine's principal function. A machine designed primarily to remove material by laser beam falls under 8456, while one designed principally for laser welding belongs in the heading covering welding machinery. For a true multi-function machine, the Section XVI combination-machine notes and, if needed, a binding ruling from CBP should guide the determination.

Yes. Machines originating from China may be subject to Section 301 additional duties on top of the base tariff rate. The applicable measure attaches at the specific tariff-line level, so importers should confirm the 10-digit HTS classification and the country of origin before entry.