The invention discloses an efficient cooling
powder feeding
nozzle and an inner hole cladding method. The efficient cooling
powder feeding
nozzle comprises a
nozzle body, a
laser beam channel is formed in the nozzle body, and a
shielding gas channel is arranged outside the
laser beam channel; the nozzle body is provided with a plurality of
powder feeding pipelines arranged around the
laser beam channel, and is characterized in that an inner
water cooling chamber is arranged between the laser beam channel and the powder feeding pipelines, and a cooling water inlet and a cooling water outlet are formed in the inner
water cooling chamber; cooling water flows through the inner
water cooling chamber to cool the outlet area of the laser beam channel. The
cooling effect of the powder feeding nozzle is improved, the reliability of the powder feeding nozzle is improved, the bearable laser power upper limit of the powder feeding nozzle is improved, and the
miniaturization difficulty can be reduced. In addition, the invention further provides a process method for cladding the inner hole of the thin-wall part, and a high-quality cladding layer can be rapidly obtained.