Nozzle system and method for removing residual stress in material through high-pressure water jet

Abstract

The invention discloses a nozzle system and method for removing residual stress in a material through high-pressure water jet, and belongs to the technical field of welding. The nozzle system comprises two parallelly arranged jet arms (3), wherein a plurality of nozzles (4) are arranged on the lower side of each jet arm (3) at intervals; the nozzles (4) on the two jet arms (3) are arranged in a staggered manner; the nozzles (4) on one jet arm (3) are arranged inclined to one side of the other jet arm (3); a core shaft (1) used for connecting a water supply pipeline is connected at one end of each jet arm (3); and the core shafts (1) are rotatably connected with the jet arms (3). When a jet arm workpiece walks, water jet ejected by the staggered nozzles on the two jet arms applies alternating tensile-compressive circle load on the material, so that the residual welding stress in the workpiece can be better loosened, and the pressure of water jet does not need to be alternately changed; and besides, a plurality of nozzles can apply continuous alternating tensile-compressive circle load, so that the reciprocating walking is not needed, and the working efficiency is obviously improved.

Description

technical field [0001] The invention relates to a nozzle system and method for eliminating internal residual stress of materials by high-pressure water jet, belonging to the field of welding technology. Background technique [0002] Metal materials inevitably produce residual stress inside the material during cold and hot processing. Residual stress has a great influence on the fatigue strength, stress corrosion, yield strength and service life of the structure. Residual stress concentration often occurs at welded joints. Aiming at this phenomenon, experts at home and abroad have proposed a variety of methods to control welding residual stress. Among them, applying alternating cyclic load to the weld area can reduce the welding residual stress more effectively. In the past, the method of using high-pressure water jet technology to eliminate welding residual stress is that the water jet acts vertically on the surface of the workpiece, and uses extremely high working pressu...

AI Technical Summary

Problems solved by technology

However, the above methods are not only complicated in structure and high in manufacturing cost, but also complicated in operation, which is not conducive to the actual processing process.

At present, the most widely used angle-variable water jet nozzles on the market are spherical nozzles, but this type of nozzle can only be used for low-pressure applications in related industries such as cleaning, spraying, and dust removal.

Therefore, the structure cannot meet the high-pressure water jet environment required to eliminate residual stress

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