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

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...

AI Technical Summary

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 for the stirring head (including structure and material) that affects the welding ability, a long-term and stable research process is required

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