Laser melt injection is used for reinforcing tools with hard particles. In contrast to competing technologies for generating metal matrix composite tool surfaces, laser melt injection uses the substrate material as a matrix. By this, the properties of the substrate and the hard material can be combined individually. Until now, due to low process speeds, the use of laser melt injection is limited to a small number of applications. For increasing the process speed, a model for the hard particle movement from the powder nozzle until the incorporation into the weld pool has been designed and analyzed. It was shown that the average hard particle velocity is a key factor for enabling laser melt injection at high process speeds. For preventing any damage of the hard particles by a high-intensity laser beam, the average hard particle velocity was increased significantly. Experiments showed that a significant increase in process speed can be reached with a high average hard particle velocity. For the first time, high process speeds of up to 100 m/min could be reached with laser melt injection of fused tungsten carbide into 1.2362 steel. For the copper substrate Hovadur® CNCS, a process speed of 30 m/min was reached.