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Friction stir hard brazing preparation method of composite pipe/calandria and composite plate

A friction stir and brazing technology, used in welding equipment, non-electric welding equipment, manufacturing tools, etc., can solve problems such as inability to obtain firm joints

Active Publication Date: 2021-09-10
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the inherent contradiction between torsional film removal and heat input, it is impossible to obtain a firm joint without cracking after welding only by optimizing the specification parameters, and a new breakthrough must be sought

Method used

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  • Friction stir hard brazing preparation method of composite pipe/calandria and composite plate
  • Friction stir hard brazing preparation method of composite pipe/calandria and composite plate
  • Friction stir hard brazing preparation method of composite pipe/calandria and composite plate

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Embodiment Construction

[0054] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0055] (1) Process design

[0056] Based on the fact that the periphery of the square tube base material is flat, it can theoretically form a large area of ​​contact friction with the shoulder of the friction stir welding tool (stirring head), which is expected to generate enough frictional heat to melt the solder and make a composite tube. The friction brazing (FSB) method is a process in which two preformed U-shaped claddings (e.g., bent from aluminum sheets) are welded to a square base pipe (e.g., square steel pipe) to produce a single composite square pipe (e.g. , aluminum-clad steel composite square tube).

[0057] The technological process of preparing composite square tubes by friction stir brazing mainly includes material preparation and assembly processes, and a welding process consisting of friction stir brazing without pins on both...

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Abstract

The invention discloses a friction stir hard brazing preparation method of a composite pipe / calandria and a composite plate. A square pipe is used as an inner pipe, and two groove-shaped pre-formed pieces are used as materials for forming an outer pipe; brazing filler metal is preset between the inner pipe and the outer pipe; welding of a lap joint interface of a groove bottom plane / a finished square pipe plane is achieved through friction stir brazing of a needle-free tool, welding of a lap joint interface of a groove wing side plane / the finished square pipe plane and a groove wing / groove wing butt joint interface is achieved at the same time through friction stir brazing of a needle-carrying tool, and therefore the composite square pipe is obtained by forming the composite plate through welding on the side face of the square pipe; and multiple composite square pipes are welded through friction stir brazing or argon arc welding, and the composite calandria is obtained. According to the friction stir brazing preparation method of the composite pipe / calandria and the composite plate, the welding temperature of the lap joint interface is increased through the thermit reaction induced by stirring friction, it is guaranteed that Si-containing aluminum-based hard brazing filler metal is smoothly melted, meanwhile, mechanical and metallurgical dual-mechanism film removing is achieved, excessive thickening of intermetallic compounds is restrained, and thermal stress is restrained.

Description

technical field [0001] The invention relates to the application of friction stir brazing, in particular to a preparation method for friction stir brazing of composite pipes / arrangements and composite plates. Background technique [0002] Friction Stir Brazing (FSB) technology is to solve the problems of Friction Stir Lap Welding (FSLW) with narrow welding width (only the diameter of the stirring pin) and hook defects at the interface of the stirring zone ( The original surface of the lower plate is easy to extend vertically into the base material of the upper plate or horizontally into the stirring core area, resulting in a thinning of the effective load-bearing thickness of the upper plate), difficulty in vertical mixing inside the stirring area, keyhole and tool wear, etc., and in 2012 Brazing technology proposed in 2011 (Zhang Guifeng, et al. Friction stir brazing: A novel process forfabricating Al / steel layered composite and for dissimilar joining of Al tosteel. Metallur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12
CPCB23K20/12B23K20/122Y02E30/30
Inventor 张贵锋刘旭杨小辉石盛范蒙
Owner XI AN JIAOTONG UNIV
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