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Fast, reliable and economic: high integrity TIG overlay welding of large components


the field of industrial production technology. The basic idea is to make workpieces of materials which are particular suitable for the manufacturing process of the current part, e.g. casting, forging etc. The “wetted” surfaces, i. e. the zones of the workpiece which will be exposed to an attacking medium, are accurately covered by a protective layer.


O 18 IMT December 2017


verlay welding, also referred to as cladding, is a well- established practice in


The attacking media can be


aggressive or hot gases like sour gas in the oil and gas production or exhaust gases from the combustion of fossil fuels; liquids with solved corrosive chemical agents like cooling water of the primary circuit in a nuclear reactor or with abrasive particles of rock as found in crude oil from an oil well; finally, solids like lumps of coal or ore and excavation waste as byproduct of mining operations. Workpieces can differ


considerably in material, size, geometry etc. Examples of smaller parts with regular geometry are fittings for tubes and pipes, bigger rotationally symmetric components are power plant steam generator nozzles, the group of huge workpieces with complex geometries comprises e.g. vessels and vessel heads for nuclear reactors. Various processes can be used to carry out overlay welding. Manual welding is often applied because of its flexibility and simple


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equipment, shielded metal arc welding is selected if the specified tolerances are not too narrow and the quality requirements of the depot remain modest, high quality coatings can be obtained with manual gas tungsten arc welding. However, the results of manual welding always depend on the skills and personal form of each individual welder and conventional TIG welding is furthermore characterised by rather low melting rates. If the necessary equipment is available,


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