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Method for preventing aluminum alloy stirring friction welding seam crystal particle from abnormal growth in heat process

A friction stir and aluminum alloy technology, applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve problems that are difficult to implement and affect weld performance

Inactive Publication Date: 2008-01-23
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0005] In order to solve the problems in the prior art of preventing abnormal growth of grains in the weld zone of aluminum alloy friction stir welded joints in the post-weld solution heat treatment, which are difficult to implement and affect the performance of the weld, the present invention proposes a method The method of preventing the grain growth of aluminum alloy friction stir welding seam abnormally during heat treatment, it prevents the grain growth of aluminum alloy friction stir welding joint welding seam area from abnormal growth during the post-weld solution heat treatment process by controlling the welding process parameters

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  • Method for preventing aluminum alloy stirring friction welding seam crystal particle from abnormal growth in heat process
  • Method for preventing aluminum alloy stirring friction welding seam crystal particle from abnormal growth in heat process

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specific Embodiment approach 1

[0011] Specific Embodiment 1: This specific embodiment is achieved by such a method: first determine the rotational speed of the stirring head, and then, within the range of the welding speed corresponding to the rotational speed of the stirring head, according to the material of the aluminum alloy material to be welded and The size and the type of stirring head determine the selection range of welding speed that does not cause welding defects. Finally, the upper limit of the above range is selected as the welding speed for friction stir welding of the aluminum alloy material to be welded. The aluminum alloy material is an aluminum alloy that can be heat treated. Alloy materials. The above-mentioned non-production of welding defects refers to ensuring that the material is fully plasticized without forming tunnel-type cavity defects in the weld; the rotation speed of the stirring head is in the range of 100 to 6000 rpm; the welding speed corresponding to the rotation speed of th...

specific Embodiment approach 2

[0012] Embodiment 2: The difference between this embodiment and Embodiment 1 is: this embodiment uses 2219-O aluminum alloy as the aluminum alloy material to be welded, its size is 300mm×100mm×5mm, and the joint type is butt joint. A tapered threaded stirring head is used, the shoulder diameter of the stirring head is 14mm (millimeters), the length of the stirring needle is 4.8mm, and the rotation speed of the stirring head is 800rpm (revolutions per minute). At this time, according to the material and The size and the type of stirring head determine that the selection range of the welding speed that does not produce welding defects is 100-400mm / min (millimeters per minute). Therefore, according to the specific embodiment one, the upper limit of the above range is selected as 400mm / min as the welding speed. Friction stir welding of 2219-O aluminum alloy material. Other steps are the same as in the first embodiment. The typical structure of the weld zone of the welded joint of...

specific Embodiment approach 3

[0013] Embodiment 3: The difference between this embodiment and Embodiment 1 is that this embodiment uses 2219-T6 aluminum alloy as the aluminum alloy material to be welded, its size is 300mm×100mm×5mm, and the joint type is butt joint. Tapered threaded stirring head is used, the diameter of the stirring head shaft shoulder is 14mm, the length of the stirring needle is 4.8mm, and the rotation speed of the stirring head is 800rpm. At this time, it is determined that no welding will occur according to the material and size of the aluminum alloy material to be welded and the type of the stirring head. The selection range of the defect welding speed is 100-260 mm / min. Therefore, according to the first embodiment, the upper limit of the above range is 260 mm / min as the welding speed to perform friction stir welding on the 2219-T6 aluminum alloy material. Other steps are the same as in the first embodiment. The typical structure of the weld zone of the welded joint in this specific ...

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Abstract

The method of preventing aluminum alloy stirring friction welding seam crystal particle from abnormal growth in heat treatment belongs to the field of welding technology. The present invention controls the welding technological parameters to control the structure in the weld seam area and make the structure under weld state condition possess relatively high strain energy. The isometric crystal structure with relatively high strain energy forms fine crystal particle structure in the fallowing solid solution heat treatment owing to the increased nucleation particles. Therefore, controlling the weld technological parameters can avoid the abnormal growth of the weld seam area crystal particles in subsequent solid solution heat treatment.

Description

technical field [0001] The invention belongs to the field of welding, and in particular relates to a method for preventing abnormal growth of crystal grains in the welding seam area of ​​aluminum alloy friction stir welding joints during post-welding heat treatment. Background technique [0002] The basic principle of friction stir welding is described in European patent EP0615480-B1. During the friction stir welding process, the heat generated by the friction between the high-speed rotating stirring head and the workpiece is used to locally plasticize the welded material. When the stirring head moves along the welding interface to When moving forward, the plasticized material moves from the front of the stirring head to the rear under the rotating friction of the stirring head, and forms a dense solid-phase weld under the extrusion of the stirring head. Although the friction stir welding method can achieve a higher quality connection than the fusion welding method, the soft...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/12
Inventor 刘会杰陈迎春冯吉才
Owner HARBIN INST OF TECH
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