Method and device for remanufacturing sheet metal welding piece by utilizing laser

Abstract

The invention discloses a method and a device for remanufacturing a sheet metal welding piece by utilizing laser and relates to the field of non-traditional machining. The method comprises the following steps of: closing cracks by employing continuous laser re-molten cracks and neighboring area; then heating the surface of the joint of the sheet welding piece in a dynamic strain ageing temperature area; and performing laser shock processing on the surface of the joint of the sheet welding piece by utilizing a double-sided laser impact method. According to the device, the sheet welding piece can be compositely strengthened and remanufactured, the cracks on the surface of the welding line are closed, the air holes inside the welding line are eliminated, the tensile strength of the joint of the sheet welding piece is improved, and the service life of the sheet welding piece is prolonged.

Description

technical field [0001] The invention relates to the field of laser processing, in particular to a method and device for double-sided laser impact strengthening of laser remelted thin plate weldment joints under the condition of dynamic strain aging temperature, which is suitable for the fields of remanufacturing, strengthening and life extension of thin plate weldments, such as sheet metal Metal weldment remanufacturing and surface strengthening. Background technique [0002] Aluminum alloy is widely used in various welding structures due to its low density, non-magnetic properties, high thermal conductivity and strength, good formability, low temperature performance, and corrosion resistance; aluminum alloys with many alloy elements and complex and changeable structures Alloys have higher and higher requirements for welding technology and equipment. The performance of welded joints is directly related to the safety and reliability of engineering applications. A lot of resea...

AI Technical Summary

Problems solved by technology

[0003] Post-weld heat treatment will destroy the welding quality of the entire weld and cause high-amplitude residual tensile stress, which directly leads to fracture failure of the weldment. A good alternative to improving the strength of the heat-affected zone of the weld is strain hardening, such as rolling the weld Or mechanical shot peening, and these processes are not practical or ideal in some complex structures. Using laser remelting to repair the cracks at the joints of thin plate weldments, and then performing laser shock strengthening treatment on the joint surface can greatly improve the mechanical properties of welded joints. The performance and fatigue strength of the welded structure are determined to a large extent by the stress concentration in the component. Unreasonable joint forms and various defects (such as incomplete penetration, undercut, etc.) In addition, some characteristics of the welded structure itself, such as the inhomogeneity of joint performance, welding residual stress, etc., all have an impact on the fatigue strength of the welded structure. Aluminum alloy welded structures often occur under repeated external forces. Fatigue fracture, fatigue failure process is generally difficult to detect, so fatigue fracture is very dangerous. According to data, 90% of the fractures in aluminum alloy welded components are caused by fatigue failure at welded joints. Therefore, aluminum alloy The fatigue performance of welded joints has received more and more attention from design and use units. To study the fatigue fracture characteristics of aluminum alloy welded joints, analyze the factors that cause fatigue fracture hazards, and estimate the fatigue life of welded joints is the key to improving and continuing to develop aluminum alloy welding. important issues of structure

Images