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Method for low-temperature joining of metal materials, and joint structure

A technology of metal materials and joining methods, applied in the direction of welding/welding/cutting items, metal processing equipment, manufacturing tools, etc., can solve problems such as inability to fully utilize mechanical properties

Active Publication Date: 2018-11-09
OSAKA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when friction stir welding, which is a solid-state joining, is used, it is difficult to suppress the strength reduction of the joint portion of high-tensile steel or heat-treated aluminum alloy, and it is impossible to fully utilize the original strength of these metal materials in the joint structure. have mechanical properties

Method used

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  • Method for low-temperature joining of metal materials, and joint structure
  • Method for low-temperature joining of metal materials, and joint structure
  • Method for low-temperature joining of metal materials, and joint structure

Examples

Experimental program
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Effect test

Embodiment 1

[0116] according to Figure 5 In the shown arrangement, carbon steel plates (JIS-S45C) are stacked on top of each other, and the carbon steel plates on the upper side are press-fitted into the rotary tool to perform spot joining. Among them, a cylindrical tool (φ12 mm, no probe) made of WC-Ni cemented carbide was used as the rotary tool, and the plate thickness of the carbon steel plate was 1.0 mm or 1.5 mm. The rotation speed of the rotary tool is 30rpm or 50rpm, the load is 12ton or 15ton, and the bonding time is 10 seconds or 30 seconds. In addition, as mentioned above, the recrystallization temperature of Fe is ~500°C, and the recrystallization temperature of carbon steel S45C is about 600°C.

[0117] Regarding the carbon steel sheet used as the test material, the hardness (strength) was changed by tempering treatment at each temperature of 400°C, 500°C, and 600°C. Figure 5 SEM photographs and EBSD grain boundary images of carbon steel sheets tempered at various tempera...

Embodiment 2

[0120] A cylindrical tool (φ12 mm, probe: φ4 mm, length 1.8 mm) made of tool steel (Hitachi Metals, YXR33) was used as the rotary tool, the rotational speed of the rotary tool was set to 50 rpm, the load was set to 15 tons, and the bonding time was set to 50 rpm. Except having set it as 10 seconds, it operated similarly to Example 1, and implemented spot joining.

Embodiment 3

[0122] A cylindrical tool (φ12mm, probe: φ4mm, length 1.8mm) made of tool steel (JIS-SKD61) was used for the rotary tool, and a low-carbon steel plate (JIS-SPCC) was used as the material to be joined. Point welding was performed in the same manner as in Example 1 except that the load was 6 ton and the joining time was 60 seconds.

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Abstract

To provide: an easy-to-use low-temperature joining method with which it is possible to effectively suppress reductions in the mechanical properties of a junction of various types of high-tensile steelor aluminum, and of a heat-affected zone; and a joint structure obtained from the low-temperature joining method. A method for joining two metal materials by forming a joint interface in which the two metal materials face each other at a joint and press-fitting to the joint a rotation tool caused to rotate at a prescribed speed, the method for low-temperature joining of metal materials characterized in that the peripheral velocity of the outermost periphery of the rotation tool is set to 51 mm / s or less, whereby the re-crystallization temperature inherent to the metal materials is reduced byintroducing a large strain to the joint, and recrystallized grains are generated at the joint interface by setting the joining temperature to less than the re-crystallization temperature inherent to the metal materials.

Description

technical field [0001] The present invention relates to a low-temperature bonding method for directly bonding metal materials and a bonded structure obtained by the low-temperature bonding method. The low-temperature bonding method and the bonded structure obtained by the low-temperature bonding method. Background technique [0002] With the increase in the strength of metal materials such as steel and aluminum alloys, a reduction in the strength of the joint portion, which restricts the mechanical properties of the joint structure, has become a serious problem. On the other hand, in recent years, friction stir welding in which the maximum attained temperature during joining does not reach the melting point of the material to be joined and which reduces the strength of the joint portion less than conventional fusion welding has attracted attention and has been rapidly put into practical use. [0003] However, when friction stir welding, which is a solid-state joining, is us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12
CPCB23K20/122B23K20/121B23K20/1205B23K20/22B23K2103/04B23K2103/10B23K20/1235B23K20/125B23K20/227B23K20/2336B23K20/1225B23K20/123B23K2103/02
Inventor 藤井英俊上路林太郎森贞好昭
Owner OSAKA UNIV