Abstract: A welded component includes at least one high temperature segment of a high alloy Cr steel with high creep strength and a low temperature segment of a low alloy steel with high toughness and/or a high yield strength which are connected materially to one another via a weld joint. In one such component a gradual transition of chemical, physical and mechanical properties in the joining area is achieved in that between the weld joint and the high temperature segment there are at least two successive clad layers of at least two lower alloy weld metals with a total content of elements which increase the creep strength, such as for example Cr, Mo, W and V, which total content decreases toward the weld joint, and/or an increasing total content of elements which increase the toughness and/or yield strength, such as for example Ni and Mn, which total content increases toward the weld joint.

Abstract: A method for producing a welded rotor of a low-pressure steam turbine, the method including providing a first forging including a steel with a minimum yield strength of approximately 700 Mpa. A second forging is provided including a heat-treated 3.5 NiCrMoV stel having an average chemical composition of 3.5% of Ni, 1.5% of Cr, 0.35% of Mo, 0.10% of V, 0.25% of C, remainder Fe. A build-up layer of welding deposit is applied to a connection surface of the second forging using build-up welding. A first local post-weld stress-relief annealing is performed so as to soften the build-up layer and a corresponding heat-affected zone. The first and second forgings are joined together so as to provide a welding location. The welding location is filled using a welding deposit so as to provided a welded join. The welded join is subjected to a second post-weld stress-relief anneal.

Abstract: A welded component includes at least one high temperature segment of a high alloy Cr steel with high creep strength and a low temperature segment of a low alloy steel with high toughness and/or a high yield strength which are connected materially to one another via a weld joint. In one such component a gradual transition of chemical, physical and mechanical properties in the joining area is achieved in that between the weld joint and the high temperature segment there are at least two successive clad layers of at least two lower alloy weld metals with a total content of elements which increase the creep strength, such as for example Cr, Mo, W and V, which total content decreases toward the weld joint, and/or an increasing total content of elements which increase the toughness and/or yield strength, such as for example Ni and Mn, which total content increases toward the weld joint.

Abstract: A welded component includes at least one high temperature segment of a high alloy Cr steel with high creep strength and a low temperature segment of a low alloy steel with high toughness and/or a high yield strength which are connected materially to one another via a weld joint. In one such component a gradual transition of chemical, physical and mechanical properties in the joining area is achieved in that between the weld joint and the high temperature segment there are at least two successive clad layers of at least two lower alloy weld metals with a total content of elements which increase the creep strength, such as for example Cr, Mo, W and V, which total content decreases toward the weld joint, and/or an increasing total content of elements which increase the toughness and/or yield strength, such as for example Ni and Mn, which total content increases toward the weld joint.

Abstract: A welded component includes at least one high temperature segment of a high alloy Cr steel with high creep strength and a low temperature segment of a low alloy steel with high toughness and/or a high yield strength which are connected materially to one another via a weld joint. In one such component a gradual transition of chemical, physical and mechanical properties in the joining area is achieved in that between the weld joint and the high temperature segment there are at least two successive clad layers of at least two lower alloy weld metals with a total content of elements which increase the creep strength, such as for example Cr, Mo, W and V, which total content decreases toward the weld joint, and/or an increasing total content of elements which increase the toughness and/or yield strength, such as for example Ni and Mn, which total content increases toward the weld joint.

Abstract: A method of producing a rotor (1), equipped with a control wheel (4), of a turbine, in particular a steam turbine, includes the following steps: A: producing a closed blade ring (5), B: separating the blade ring (5) into a plurality of parts (11, 12), C: assembling the parts (11, 12) around the rotor (1) in such a way that the assembled blade ring (5) encloses the rotor (1), and D: welding the assembled blade ring (5) to the rotor (1) at an axial section (10) intended for the control wheel (4).