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Self-sustaining friction stir welding stirring head with irrotational lower shaft shoulder and welding method of stirring head

A friction stir welding and friction stir technology, which is used in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the problems of low mechanical properties of welded joints, increased welding heat input, and difficulty in welding seam forming, so as to reduce welding heat. Input, reduce loads, improve the effect of weld formation

Inactive Publication Date: 2012-07-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the lower shoulder of the existing self-sustaining friction stir welding stirrer rotates and produces heat, the welding heat input increases, resulting in difficulty in forming the weld seam and the low mechanical properties of the welded joint, and further proposes a lower shoulder without Rotating self-sustaining stirring head and friction welding method

Method used

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  • Self-sustaining friction stir welding stirring head with irrotational lower shaft shoulder and welding method of stirring head
  • Self-sustaining friction stir welding stirring head with irrotational lower shaft shoulder and welding method of stirring head
  • Self-sustaining friction stir welding stirring head with irrotational lower shaft shoulder and welding method of stirring head

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specific Embodiment approach 1

[0017] Specific implementation mode one: as Figure 1~2 As shown, a self-sustaining friction stir welding stirring head with a non-rotating lower shoulder in this embodiment, the stirring head is composed of an upper stirring head 1 and a lower stirring head 2, and the upper stirring head 1 is composed of an upper shaft The shoulder 7 and the stirring needle 6 are composed of the upper end surface of the stirring needle 6 fixed on the lower end surface of the upper shoulder 7, and the upper shoulder 7 and the stirring needle 6 are coaxially arranged, and it is characterized in that: the lower stirring The head 2 is composed of a supporting base 3, a radial positioning bearing 4 and a lower shoulder 5, the center of the upper end surface of the supporting base 3 is processed with a circular groove 3-1, and the radial positioning bearing 4 is installed on a circular In the shaped groove 3-1, the lower shoulder 5 is fixed on the upper end surface of the support base 3, and the lo...

specific Embodiment approach 2

[0018] Specific implementation mode two: as figure 2 As shown, the diameter D1 of the upper shoulder 7 in this embodiment is 3 to 5 times the thickness of the workpiece to be welded, the diameter D2 of the lower shoulder 5 is 4 to 6 times the thickness of the workpiece to be welded, and the diameter d of the stirring pin 6 is 3 to 5 times the thickness of the workpiece to be welded. 1 to 2 times the thickness of the welded workpiece. With such a design, good weld seam formation can be obtained while ensuring sufficient strength of the stirring needle. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0019] Specific implementation mode three: as figure 2 As shown, the diameter D1 of the upper shaft shoulder 7 in this embodiment is 4 times of the thickness of the workpiece to be welded, the diameter D2 of the lower shoulder 5 is 5 times of the thickness of the workpiece to be welded, and the diameter d of the stirring pin 6 is 4 times of the thickness of the workpiece to be welded. 1.5 times. With such a design, good weld seam formation can be obtained while ensuring sufficient strength of the stirring needle. Other steps are the same as in the second embodiment.

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Abstract

The invention relates to a stirring head and a welding method, in particular to a self-sustaining friction stir welding stirring head with an irrotational lower shaft shoulder and a welding method of the stirring head, which solve the problems that welding heat input is increased as a lower shaft shoulder of an existing self-sustaining friction stir welding stirring head rotates to generate heat, weld formation is difficult, and the mechanical property of a welding joint is low. A circular groove is machined at the center of the upper end face of a support base, a radial positioning bearing is mounted in the circular groove, the lower shaft shoulder is fixedly mounted on the upper end face of the support base, a stirring pin is longitudinally machined on the lower shaft shoulder, and the lower portion of the stirring pin penetrates through the stirring pin and is mounted on the support base through the radial positioning bearing during welding. The welding method includes: firstly, determining the size of the stirring head; secondly, fixing workpieces to be welded; thirdly, positioning the stirring head before welding; fourthly, determining the rotation speed of the stirring head and the pressing depth of an upper shaft shoulder; and fifthly, determining welding speed and welding the first workpiece to be welded and the second workpiece to be welded. The stirring head and the welding method are used for friction stir welding.

Description

technical field [0001] The invention relates to a stirring head for friction stir welding and a welding method using the stirring head for friction stirring. Background technique [0002] The self-sustaining friction stir welding method is a new type of environmentally friendly solid phase connection technology derived from conventional friction stir welding. It can not only effectively avoid welding defects such as cracks and pores caused by traditional fusion welding methods, but also solve conventional friction stir welding. Welding needs a backing plate, and there may be problems such as root defects in the weld, so the self-sustaining friction stir welding method has been rapidly developed and widely used. In the above method, the stirring head is composed of a stirring pin and upper and lower shoulders. The lower shoulder acts as a backing plate for conventional friction stir welding. During welding, the lower shoulder is driven by the stirring pin to rotate and genera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12
Inventor 赵运强刘会杰侯军才李金全
Owner HARBIN INST OF TECH
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