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Preparation method of composite stirring head for friction stir welding of high melting point materials

A friction stir welding and stirring head technology, which is used in welding equipment, non-electric welding equipment, manufacturing tools, etc., to achieve the effect of dense structure, neat grains and high strength

Active Publication Date: 2020-04-14
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most critical part of FSW technology for high melting point materials is the design of welding tools. Due to the life of welding tools, FSW technology for high melting point materials is still in the research stage

Method used

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  • Preparation method of composite stirring head for friction stir welding of high melting point materials

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Experimental program
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Effect test

Embodiment 1

[0023] The invention provides a preparation method of a high melting point material friction stir welding composite stirring head:

[0024] The stirring head is composed of a conical stirring needle 1 at the end, a cylindrical shoulder outer 2 and a shoulder core 3 at the root, and the material 1 of the stirring needle 1 and the outer shoulder 2 is WC-(Fe-Co-Ni) alloy , its composition is composed of 80% WC, 13% Fe, 4% Co and 3% Ni by mass fraction; the material 2 of the shoulder core 3 is WC-(Cu-Ni) alloy, and its composition is composed of mass fraction The fraction is 80% WC, 8% Ni and 12% Cu; the thickness ratio of the stirring head shoulder core 3 to the outer shoulder 2 is 4:6, and the stirring needle 1 and the outer shoulder 2 adopt a fillet transition Design; Its preparation method comprises the following steps:

[0025] S1. Raw material preparation: Weigh the powder respectively according to the above-mentioned ratio of WC-(Cu-Ni) alloy and WC-(Fe-Co-Ni) alloy, and e...

Embodiment 2

[0033] The invention provides a preparation method of a high melting point material friction stir welding composite metal stirring head:

[0034]The stirring head is composed of a conical stirring needle 1 at the end, a cylindrical shoulder outer 2 and a shoulder core 3 at the root, and the material 1 of the stirring needle 1 and the outer shoulder 2 is WC-(Fe-Co-Ni) alloy , its composition is composed of 75% WC, 15% Fe, 5% Co and 5% Ni by mass fraction; the material 2 of the shoulder core 3 is WC-(Cu-Ni) alloy, and its composition is composed of mass fraction The fraction is 65% WC, 15% Ni and 20% Cu; the thickness ratio of the stirring head shoulder core 3 to the outer shoulder 2 is 3:7, and the stirring pin 1 and the outer shoulder 2 adopt rounded transition Design; Its preparation method comprises the following steps:

[0035] S1. Raw material preparation: Weigh the powders according to the above-mentioned ratio of WC-(Cu-Ni) alloy and WC-(Fe-Co-Ni) alloy, and each add a ...

Embodiment 3

[0043] The invention provides a preparation method of a high melting point material friction stir welding composite metal stirring head:

[0044] The stirring head is composed of a conical stirring needle 1 at the end, a cylindrical shoulder outer 2 and a shoulder core 3 at the root, and the material 1 of the stirring needle 1 and the outer shoulder 2 is WC-(Fe-Co-Ni) alloy , its composition is composed of 85% WC, 9% Fe, 3% Co and 3% Ni by mass fraction; the material 2 of the shoulder core 3 is WC-(Cu-Ni) alloy, and its composition is by mass The fraction is 70% WC, 14% Ni and 16% Cu; the thickness ratio of the stirring head shoulder core 3 to the outer shoulder 2 is 6:4, and the stirring needle 1 and the outer shoulder 2 adopt rounded transition Design; Its preparation method comprises the following steps:

[0045] S1. Raw material preparation: Weigh the powders according to the above-mentioned ratio of WC-(Cu-Ni) alloy and WC-(Fe-Co-Ni) alloy, and each add a forming agent p...

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Abstract

The invention discloses a preparation method of a friction stir welding composite stirring head made of materials with a high melting point. The stirring head is composed of a conical stirring pin atthe end and a cylindrical shaft shoulder at the root, and a fillet transition design is adopted between the root and the end of the stirring head. The stirring pin and the exterior of the shaft shoulder are made of 1WC-(Fe-Co-Ni), the core part of the shaft shoulder is made of 2WC-(Cu-Ni), a stirring head composite blank is formed after compression molding, and the composite blank is subjected topre-sintering, machining and vacuum sintering to obtain the finished product. The method is easy to operate, the stirring head is easy to process, the machining allowance in subsequent machining of the finished sintered product is greatly reduced, the production cost is reduced, and the production cycle is shortened.

Description

technical field [0001] The invention relates to the technical field of preparation of powder metallurgy materials, and more specifically, relates to a method for preparing a composite stirring head for friction stir welding of high melting point materials. Background technique [0002] Friction Stir Welding (hereinafter referred to as FSW) is an emerging solid-phase joining technology, which mainly makes the metal in the thermoplastic state through the frictional heat between the stirring head and the workpiece to be welded, and the pressure of the stirring head Under the action, it flows plastically from the front to the rear, so that the parts to be welded are pressure-welded as a whole. Due to the special connection mechanism of friction stir welding, the stirring head becomes the key component of friction stir welding. During the working process, the stirring head will be subjected to huge mechanical force and high temperature, so it has great influence on the high tempe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00B23K20/12
CPCB23K20/1245B23P15/00
Inventor 肖逸锋任赛男钱锦文吴靓许艳飞欧艳张乾坤叶明强曾毅夫宋二军刘远周益辉
Owner XIANGTAN UNIV