Method for mixing, rubbing and welding technique of 2A70 aluminium alloy cylindrical body (delta 20mm)

A technology of friction stir welding and process method, which is applied in the direction of metal processing equipment, manufacturing tools, welding equipment, etc., to achieve stable and reliable mechanical properties, improve the performance of welded joints, and have good use effects

Active Publication Date: 2010-02-17
航天科工火箭技术有限公司
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Problems solved by technology

[0005] For thick plate aluminum alloys, the process parameters can be optimized to a reasonable range through various process methods, but f

Method used

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  • Method for mixing, rubbing and welding technique of 2A70 aluminium alloy cylindrical body (delta 20mm)
  • Method for mixing, rubbing and welding technique of 2A70 aluminium alloy cylindrical body (delta 20mm)

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[0019] For the specific welding process, see figure 1 Shown: use the first stirring head to start welding from point A of the cylinder, stop welding after welding to point B, take out the first stirring head from the cylinder, and prepare the same material and the same heat treatment state as the cylinder. , plug the keyhole pin with the same taper as the welding keyhole to the keyhole at point B, use the second mixing head to press the keyhole pin into the keyhole, and then use the second mixing head to remove the first mixing head from the first mixing head. Restart welding at the welding keyhole, that is, start welding from point B. After the welding of the remaining welding seam of the cylinder to point A, take out the stirring head and leave a welding keyhole at point A. After the welding is completed, X-ray and ultrasonic inspection of the joints of the two stirring heads showed no defects, and the mechanical properties were inspected, and the weld strength could reach m...

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Abstract

The invention relates to the welding field and discloses a method for the mixing, rubbing and welding technique of a 2A70 aluminium alloy cylindrical body (delta 20mm). A first mixing head probe is arranged at a welding seam to be welded of the cylindrical body so that a first mixing head welds a hoop welding seam of a cylindrical body and stops welding the welding head on the mixing head is usedup; the first mixing head is taken out; a second mixing head is mounted; a key hole pin which has the same taper as the welded key hole and the same materials and thermal process state as the cylindrical body is filled into the key hole which is remained after welding the welding seam by the first mixing head; the second mixing head presses the key hole pin into the key hole; the second mixing head re-welds at the welded key hole of the first mixing head, and the welding of the remained welding seam of the cylindrical body is completed. When the aluminium alloy cylindrical body with large thickness and diameter is stirred, rubbed and welded, the two mixing heads are utilized to realize the welding of the same hoop welding seam of the cylindrical body, and only one welded key hole is kept on the same hoop welding seam of the cylindrical body, thereby ensuring that the same hoop welding seam is continuously welded into a whole; and the quality of the welding seam is stable.

Description

technical field [0001] The invention relates to the welding field, and is specifically applied to the friction stir welding welding process. Background technique [0002] Friction stir welding technology is an emerging solid-phase joining technology in recent years. It is mainly used in aluminum alloy plate splicing, profile forming, circumferential weld welding, etc., and can realize the equal-strength connection of various aluminum alloys. Therefore, it is widely used in medium and thin plate aluminum alloy parts. However, for large thickness, large diameter cylinder and long weld seam welding, the service life of the stirring head is a key technology that restricts the development of this technology. [0003] For friction stir welding of aluminum alloys of medium and thin plates, it is already a mature technology, but the research on friction stir welding of aluminum alloys of thick plates has just started. [0004] At present, electron beam welding is mainly used to fo...

Claims

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Application Information

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IPC IPC(8): B23K20/12B23K103/10
Inventor 乔凤林徐晓东余书平鄢江武唐众民张振宇罗晓梅
Owner 航天科工火箭技术有限公司
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