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1. (WO2018134605) POWDER DELIVERY ASSEMBLY

Pub. No.:    WO/2018/134605    International Application No.:    PCT/GB2018/050154
Publication Date: Fri Jul 27 01:59:59 CEST 2018 International Filing Date: Sat Jan 20 00:59:59 CET 2018
IPC: B23K 26/342
B29C 64/153
B23K 26/14
B23K 26/144
B33Y 30/00
B29C 64/209
Applicants: ADVANCED LASER TECHNOLOGY LTD
Inventors: FEARON, Eamonn
Title: POWDER DELIVERY ASSEMBLY
Abstract:
A powder delivery assembly (12) comprising a central bore (100) with an outlet through which, in use, a heating beam, such as a laser, and optionally a flow or gas, is arranged to pass along a beam axis (18) coaxial with the central bore, and a plurality of powder delivery nozzles (22), each powder delivery nozzle (22) comprising a bore and an outlet through which bore a stream of gas-powder flows, in use, along a respective powder trajectory (102) which is coaxial with the respective powder delivery nozzle bore, wherein the powder delivery nozzles (22) are arranged such that their respective powder trajectories (102) substantially intersect (32) the beam axis (18) downstream of the central bore's (100) outlet. The angle (104) between the powder trajectories (102) and the beam axis (18) is preferably 42-degrees, which improves powder deposition and confinement at the melt pool. The shape, materials and surface of the powder delivery assembly (12) is/are configured to minimise absorption of heat radiated from the melt pool (32), and to improve, by streamlining, the flow of gases away from the melt pool (32).