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A resistance heat source assisted composite biaxial needle-free friction stir welding method

A friction stir and welding method technology, applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the problems of low welding speed, wear of stirring head, heavy equipment, etc., to improve welding speed, improve strength, and reduce welding. The effect of defects

Active Publication Date: 2019-06-28
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in the special high temperature environment of friction stir welding, when welding metal materials with high melting point, the wear of the stirring head is serious, and the equipment is generally heavy and complicated.
In addition, when welding materials with high melting point and large thickness, the welding speed is often low

Method used

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  • A resistance heat source assisted composite biaxial needle-free friction stir welding method
  • A resistance heat source assisted composite biaxial needle-free friction stir welding method
  • A resistance heat source assisted composite biaxial needle-free friction stir welding method

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Embodiment Construction

[0020] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0021] refer to figure 1 , figure 2 , image 3 and Figure 4 , a resistance heat source assisted composite biaxial needle-free friction stir welding method, comprising the following steps:

[0022] 1) Clamping and fixing the first workpiece 1 to be welded and the second workpiece 2 to be welded on the welding workbench, the seam gap between the first workpiece 1 to be welded and the second workpiece 2 to be welded is 0-0.6 mm; The welding workbench and workpiece fixture need to be insulated to prevent the danger of equipment leakage; before clamping, it is necessary to clean the joint surface of the first workpiece 1 to be welded and the second workpiece 2 to be welded to remove oil. Remove oxide film;

[0023] 2) The first workpiece 1 to be welded, the second workpiece 2 to be welded, the first stirring head 3, and the second stirring head 4 are connected by t...

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Abstract

The invention discloses a resistor heat source-assisted composite double-shaft needle-free friction stir welding method. The method comprises the steps that stirring friction heads are adopted as electrodes of a resistor heat source, high-density currents are provided for the interior of a to-be-welded workpiece through a direct-current switch power supply, and the resistor-assisted heat source is provided for the stirring heads in the friction stir welding process; the stirring heads rotating at a high speed are inserted into the two sides of a joint, and upsetting pressure is exerted to metal at the joint through a shaft shoulder, so that the metal material at the joint is softened; the metal structure at the joint achieves a plasticizing state under the stirring effect through the stirring heads rotating at the high speed, and meanwhile micro-forging treatment is conducted on the plasticized metal by adopting an ultrasonic vibration exciter, so that metal structure crystalline grains at the joint are refined; the stirring heads do feeding motion in the direction of the joint, a cavity formed after a stirring needle moves is continuously filled with the plasticized metal under the stirring and extruding effect of the stirring heads, and the plasticized metal is gradually cooled and solidified to form a final welding joint. According to the method, the life of the stirring heads is prolonged, the welding thickness is increased, the welding speed is increased, and welding defects are reduced.

Description

technical field [0001] The invention belongs to the technical field of friction stir welding and forming, and in particular relates to a resistance heat source assisted composite biaxial needleless friction stir welding method. Background technique [0002] Friction stir welding (FSW) is a solid phase welding technology, originally used for the connection of low melting point metals (such as aluminum alloys and magnesium alloys, etc.), because there is no melting of materials in the FSW process, so this technology can avoid traditional fusion welding Common problems such as cracks, pores and deformation, and have low requirements for operation and equipment. Although the research on friction stir welding technology has been more and more in-depth, but there are still deficiencies in this technology. [0003] Friction stir welding mainly stirs the workpiece through the stirring head, and relies on frictional heat to heat the metal around the joint of the workpiece to a plast...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/12B23K20/26
CPCB23K20/123B23K20/1245B23K20/26
Inventor 赵升吨张鹏范淑琴董朋王永飞
Owner XI AN JIAOTONG UNIV
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