powder injection

O.B

Laser cladding by powder injection is a deposition technique using a coating material in form of powder particles and laser beam .The laser beam heats the substrate strongly enough to melt it locally ,and powder particles are blown in the melting pool . Laser cladding with powder injection methods starts with the formation of a melt pool in the substrate in which cladding powder is being fed. Thus a clad layer is formed almost instantaneously. I haven't a problem with the moving heat source; my problem is how to put the powder in the melt pool. Thanks.