| 摘要 |
<p>The method comprises preheating a substrate (1) at a temperature in close to the solidus temperature of the substrate material, heating the substrate with a heating source (10) for the formation of a melting zone (3), supplying a filler material (20) for producing a liquid welding product in the melting zone, and introducing the filler material in the welding product in the form of powder grains (32). The size of the powder grains is selected, so that the powder grains melt in the melting zone only at the outer circumference and the unmelted residue serves as seed. The method comprises preheating a substrate (1) at a temperature in close to the solidus temperature of the substrate material, heating the substrate with a heating source (10) for the formation of a melting zone (3), supplying a filler material (20) for producing a liquid welding product in the melting zone, and introducing the filler material in the welding product in the form of powder grains (32). The size of the powder grains is selected, so that the powder grains melt in the melting zone only at the outer circumference and the unmelted residue serves as seed. The powder grains are fed to the melting zone with higher speed, so that they deeply penetrate into the welding product. The size of the powder grains is sufficiently low to produce fine and homogeneous structure. The powder grains are larger, so that only a part of the powder grains melts and the residue serves as seed. The quantity of the powder grains is selected, so that a desired degree of structure is obtained. An independent claim is included for a device for forming a globular microstructure in a melting zone during connection or deposition welding process.</p> |
