| 摘要 |
<p>A powder delivery nozzle (32), for a laser cladding delivery head (38), includes inner and outer sleeves (52, 54). The inner sleeve (52) defines a central passage enabling a laser beam to pass along the nozzle axis. The sleeves (52, 54) define a multi-branched longitudinally extending powder flo w- path system (52, 57, 58, 59, 60, 62). The system (52, 57, 58, 59, 60, 62) includes a first set of passages (59), and a second set of passages (60), wi th the passages (59) of the first set angularly offset from the passages (60) o f the second set. Each passage (59) of the first set communicates with two passages (60) of the second set by a circumferential passage or gallery (58) such that powder from each passage (59) of the first set passes through to t wo passages (60) of the second set. The same form of communication is able to apply to any other set.</p> |
