A control method for spot defects in nickel-based welds

Abstract

The invention belongs to the technical field of welding, and particularly discloses a point defect control method for a nickel-based weld joint. By utilizing the method, the nickel-based weld joint can be controlled to be free of point defect, and weld joint deposition metal meeting the requirements of mechanical performance design can be obtained. According to the method, the formation of the welding point defect is controlled by controlling welding materials to comprise the following microalloy addition elements and impurity elements by weight: less than or equal to 0.35% of Al, less than or equal to 0.35% of Ti, 0.50-1.0% of Nb, less than or equal to 0.005% of Ca and less than or equal to 0.005% of Mg. The method applies to the welding of an Inconel690 alloy, and a point defect-free nickel-based weld joint is obtained. The weld joint deposition metal has the performance of room temperature yield strength sigma0.2 of more than or equal to 240MPa, tensile strength sigmab of more than or equal to 550MPa, elongation A% of more than or equal to 30 and weld joint deposition metal room temperature impacting energy Akv of more than or equal to 70J. Aiming at solving the problem that the weld joint usually has point defects in the welding process of the Inconel690 alloy, the content of microalloy addition elements Al, Ti and Nb and the impurity elements of a welding wire is controlled by controlling the microalloy addition elements and the impurity elements in the welding materials, so that the welding efficiency can be improved, and the utilization rate of the materials can be increased.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a method for controlling nickel-based weld point defects. The method can be used to control nickel-based welds without point defects, and to obtain weld deposited metal meeting mechanical property design requirements. This method is suitable for welding of Inconel690 alloy. Background technique [0002] The nickel-based Inconel 690 alloy base metal corresponds to a large number of alloying elements in the welding material. The microalloying elements of the welding material of the same brand provided by major foreign companies are very different. During on-site welding, the fluidity of the liquid weld metal is poor, the depth of penetration is shallow, and welding points often occur. There are no reports on the control of spot defects in nickel-based welds. [0003] In order to optimize the mechanical properties of the nickel-based alloy base metal, microalloying ele...

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Problems solved by technology

[0002] The nickel-based Inconel 690 alloy base metal corresponds to a large number of alloying elements in the welding material. The microalloying elements of the welding material of the same brand provided by major foreign companies are very different. During on-site welding, the fluidity of the liquid weld metal is poor, the depth of penetration is shallow, and welding points often occur. There are no reports on the control of spot defects in nickel-based welds.

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