Technological method for improving performance of withdrawable type friction stir welding joint
A technology of welding joints and process methods, which is applied in the field of improving the performance of retractable friction stir welding joints, can solve the problems of low fatigue performance of workpieces, and achieve the effects of reducing metal flow turbulence, reducing heat input, and improving density
Inactive Publication Date: 2021-04-30
昆山六丰机械工业有限公司
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is: to solve the keyhole left after welding by retractable friction stir welding, but the needle retraction stage will cause the fatigue performance of the workpiece to be lower than that of one welding, thus providing an improved Process method for performance of withdrawable friction stir welded joint
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Embodiment
[0032] This embodiment provides a process for improving the performance of retractable friction stir welded joints, such as figure 1 shown, including the following steps:
[0033] S1. Effectively clean the surface of the two-piece hub, deal with the dust, burrs, oil stains and unevenness on the two-piece hub, and keep the area to be welded of the two-piece hub clean, metallic and free of foreign matter;
[0034] S2. Fix the two-piece hub respectively;
[0035] S3. After the two-piece hub is positioned relative to the stirring needle, the first welding is performed on the two-piece hub;
[0036] S4. Slowly withdraw the needle during the repeated welding process. At this stage, the rotation speed and forward speed of the stirring needle are consistent with the first welding; the axial pressure is reduced by 10%, the heat input is reduced, and the flash is reduced;
[0037] S5. While reducing the pressure, the process window of the needle drawing speed is 25-30mm / min. This para...
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The invention relates to a technological method for improving the performance of a withdrawable type friction stir welding joint. The technological method for improving the performance of the withdrawable type friction stir welding joint comprises the following steps of S1, effectively cleaning the surface of a two-piece type hub; S2, fixedly installing the two-piece type hub respectively; S3, carrying out first-pass welding on the two-piece type hub; S4, slowly drawing a needle in the repeated welding process, wherein the axial pressure is reduced by 10 percent, heat input is reduced, and flashes are reduced; and S5, while the pressure is reduced, enabling a needle drawing speed process window to be 25 to 30 mm / min. According to the technological method for improving the performance of the withdrawable type friction stir welding joint provided by the invention, aiming at a two-piece type aluminum alloy hub friction stir welding withdrawal needle process, metal flow turbulence and heat input are reduced by changing axial pressure and the withdrawal speed of the stirring needle in the withdrawal needle process, so that the density of a weld nugget area is improved, the recrystallization grain size is controlled, and the fatigue performance of the hub is improved.
Description
technical field [0001] The application belongs to the technical field of automobile preparation, and in particular relates to a process method for improving the performance of retractable friction stir welding joints. Background technique [0002] Friction stir welding technology is a solid-phase joining technology born in the UK Welding Technology Institute (TWI) in the 1990s. Its welding process has no arc, smoke, gas protection and metal filling. It is a typical new green welding technology. Compared with the traditional fusion welding method, the weld has the advantages of high joint strength, not easy to produce defects such as thermal cracks and pores, small welding deformation, and low residual stress. In particular, the unique advantages of this technology in welding aluminum alloys have made it widely used in the manufacture of various aluminum alloy structural parts in the fields of aerospace, automobiles, ships, and rail vehicles. However, in the process of engin...
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IPC IPC(8): B23K20/12B23K20/26
CPCB23K20/12B23K20/26
Inventor 宗绪惠范纲衔路建琦张原发沈湘岚
Owner 昆山六丰机械工业有限公司