Deposition Welding |
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Building shapes out of powder and wire |
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Deposition welding is one of the generating processes and is applied for surface finishing as well as repairing or modifying existing components. Depending on the task at hand, either manual or automated laser deposition welding is used. |
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Manual laser deposition welding: the laser beam melts the filler wire and |
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Manual laser deposition welding
In the case of manual deposition welding, the welder guides the filler material "by hand" to the area to be welded. A thin wire with a diameter between 0.15 and 0.6 millimeters is primarily used as filler material in this process. The laser beam melts the wire. The molten material forms
a strong bond with the substrate, which is also melted, and
then solidifies, leaving behind a small raised area. The welder
continues in this fashion, spot by spot, line by line, and layer
by layer, until the desired shape is achieved. Argon shields
the work process from the ambient air. Finally, the part is restored to its original shape by grinding,
lathing, milling, EDM etc. |
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When coating the surface, several powder coatings are either melted onto one another or next to one another, as required. The individual welding paths must precisely overlap in order to achieve a texture that is free from errors. |
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Automated laser deposition welding
In the case of automated deposition welding, the machine guides the filler material to the area to be welded. Although the material can also be a wire, this process primarily uses metal powders. Metal powder is applied in layers to a base material and fused to the base material without any pores or cracks arising. The metal
powder forms a high-tensile weld joint with the surface. After cooling,
a metal layer develops that can be machined mechanically. A strength of this process is that it can be used
to build up a number of similar or of differing metal layers. |
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