Working workpiece using laser beam comprises moving workpiece with respect to beam to produce melt, current being applied to produce field with divergent or convergent lines of current

摘要

Working a workpiece (1) using a laser beam (2) comprises moving the workpiece with respect to the beam, or vice-versa, to produce a melt (3). Current is applied to the melt to produce a field with divergent or convergent lines of current, without applying an external magnetic field.