Method for fusion cutting of hot form part made of steel, comprises coating the surface of the hot form part with a corrosion protective coating, where the hot form part is severed on interface by a laser beam

摘要

The method comprises coating surface of a hot form part with a corrosion protective coating, where the hot form part is severed on interface by a laser beam and material melted by laser beam is blown in the area of the interface by cutting gas towards bottom of the interface. The cutting gas is supplied with the laser beam to the interface or is supplied to corrosion protective material, which is supplied through the cutting gas to lateral edges of the hot form part produced by the laser beam and is deposited as a corrosion protection on the cut surfaces. The method comprises coating surface of a hot form part with a corrosion protective coating, where the hot form part is severed on interface by a laser beam and material melted by laser beam is blown in the area of the interface by cutting gas towards bottom of the interface. The cutting gas is supplied with the laser beam to the interface or is supplied to corrosion protective material, which is supplied through the cutting gas to lateral edges of the hot form part produced by the laser beam and is deposited as a corrosion protection on the cut surfaces. The corrosion protective material is brought to the gas beam in powder form. Compressed air, oxygen, carbon dioxide or inert gas is used as cutting gas. The cutting gas is blown with an overpressure of 8-12 bar on the interface. The corrosion protective layer is applied with a thickness of 30-40 mu m on the cutting edges. The cutting gas beam is brought to metal powder, powder of metal organic compounds and/or inorganic materials as corrosion protective material.