Pin tool suitable for local dry-type friction stir welding in water environment

A technology of friction stir welding and stirring head, which is applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., and can solve the problem that the stirring head cannot be applied to local dry welding, poor stability of arc and droplet transition, complex supporting equipment and technology Conditions and other issues, to achieve the effect of narrowing the distribution range, reducing the width and softening degree, and accelerating the cooling rate

Inactive Publication Date: 2009-10-14
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing friction stir welding stirring head cannot be applied to local dry welding in the water environment, and underwater welding requires complex supporting equipment and technical conditions, which is difficult to realize, and the arc and droplet transition Poor stability, the decomposition of water under the high temperature of the arc leads to the increase of hydrogen in the weld, resulting in the deterioration of the performance of the joint, and then provides a stirring head suitable for local dry friction stir welding in the water environment

Method used

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  • Pin tool suitable for local dry-type friction stir welding in water environment
  • Pin tool suitable for local dry-type friction stir welding in water environment

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specific Embodiment approach 1

[0008] Embodiment 1: Combining Figure 1 to Figure 2 Illustrating this embodiment, a stirring head suitable for local dry friction stir welding in a water environment includes a stirring head base, which is composed of a cylindrical clamping body 3 , a cylindrical connecting body 4 and a stirring head. The cylindrical clamping body 3, the cylindrical connecting body 4 and the stirring needle 1 are coaxially made into one from top to bottom in sequence, and a positioning table is formed at the junction of the stirring needle 1 and the cylindrical connecting body 4. The shoulder end surface 4-2, the side surface of the cylindrical clamping body 3 is provided with an anti-loose fastening surface 3-1, and the cylindrical connecting body 4 is provided with an annular heat-insulating heat-dissipating groove 4-1; the stirring The needle 1 is composed of a shaft shoulder 1-1 and a needle body 1-2. The shaft shoulder 1-1 and the needle body 1-2 are coaxially made into one body from top...

specific Embodiment approach 2

[0009] Specific implementation mode 2: Combining Figure 1 to Figure 2 Describing the present embodiment, the inverted funnel-shaped cover 2-2 of the present embodiment is made of stainless steel, copper or rubber material. Other components and connection relationships are the same as in the first embodiment.

specific Embodiment approach 3

[0010] Specific implementation three: combination Figure 1 to Figure 2 Describing the present embodiment, the upper ends of the plurality of stainless steel wire bundles 2-3 in the present embodiment are uniformly fixed in the U-shaped wire brush holder 2-1. With this setting, the water is better drained. Other components and connection relationships are the same as in the first embodiment.

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Abstract

A pin tool suitable for local dry-type friction stir welding in water environment relates to a pin tool of friction stir welding. The invention solves the problems that the existing pin tool of friction stir welding is not applicable to the local dry-type welding in water environment; as underwater welding needs complicated supporting equipment and technical conditions, the difficulty of implementation is comparatively large; and the stability of an electric arc and drop transfer is poor and the decomposition of water at the high temperature of the electric arc can lead to seam hydrogenation so as to cause the deterioration of joint performance. A fitting nut is connected with the upper thread of a shaft shoulder and a positioning backing ring is arranged between the upper end face of the fitting nut and the end face of a shoulder. A U-shaped steel wire brush holder is fixedly installed on the shoulder. The upper ends of a plurality of stainless steel tendons are fixedly installed in the U-shaped steel wire bush holder and an inverted funnel-shaped shade covers the outside of the steel wire brush. The pin tool overcomes the defects of the existing pin tool of friction stir welding in welding under water environment, satisfies the requirements of local dry-type welding under water environment and also boosts the performance of joints.

Description

technical field [0001] The invention relates to a stirring head for friction stir welding, in particular to a stirring head suitable for local dry friction stir welding in a water environment. Background technique [0002] Friction Stir Welding (FSW) is a new solid-phase joining method invented by the Welding Institute (TWI) in the United Kingdom in 1991, and its patent number is US5460317. At present, a series of studies have been carried out on the introduction of cooling external field to improve the weld formation and joint performance of friction stir welding. In the FSW process of 7075 aluminum alloy, J.Q.Su et al. obtained a fine weld nugget area with a size of about 100nm in the formed weld behind the stirring head cooled by a mixture of water, methanol and dry ice [J.Mater.Res. 2003, 18: 1757], the introduction of a forced cooling external field during friction stir welding changes the thermal cycle and temperature field of the welding process, thereby changing the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12B23K20/26
Inventor 黄永宪刘会杰张会杰周利沈俊军张郁中
Owner HARBIN INST OF TECH
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