Sandvik – Welding below melting point
Joining of metals for high pressure/high temperature applications is done using welding. The base metal strength is usually influenced by the welding. New welding or joining technologies that allow joining at a temperature below the melting point of the base metal.
When a precipitation hardened material is welded the strength is deteriorated and the properties of the joint will not be sufficient for applications in high temperature applications. We need to find a reliable, economically feasible method to join material without influencing the microstructure of the base metal. This means that welding has to be done below the melting point of the metal. The welding is currently done using conventional methods such as Tungsten Inert Gas (TIG) which is done above the melting point of the metal (approx. 1500-1600°C) and the welding is primarily done on stainless steels and high nickel alloys with thicknesses ranging from 2-20 mm.
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