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Book Chapter
Diffusion Brazing
Available to PurchaseBook: Principles of Brazing
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.pb.t51230207
EISBN: 978-1-62708-351-5
... Abstract This chapter discusses the process, principles, and modeling of the diffusion brazing system. The applications of diffusion brazing to wide-gap joining and layer manufacturing are also discussed. diffusion brazing filler metals layer manufacturing wide-gap modeling...
Abstract
This chapter discusses the process, principles, and modeling of the diffusion brazing system. The applications of diffusion brazing to wide-gap joining and layer manufacturing are also discussed.
Image
Sequential stages in diffusion brazing for a parent metal A and filler meta...
Available to PurchasePublished: 01 August 2005
Fig. 6.4 Sequential stages in diffusion brazing for a parent metal A and filler metal B that enter into a single eutectic reaction and do not form intermediate intermetallic compounds. In stage 1, at the commencement of heating, some interdiffusion occurs until melting commences at composition
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Image
Published: 01 August 2005
Image
Alumina assemblies joined by active diffusion brazing. (a) Plot of fracture...
Available to PurchasePublished: 01 August 2005
Fig. 7.27 Alumina assemblies joined by active diffusion brazing. (a) Plot of fracture strength in four-point bend tests of beams cut from assemblies. Adapted from Marks et al. [2000] . Each plate was coated with copper and joined at 1400 °C (2550 °F), in a vacuum better than 13 mPa (2 × 10 –6
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Image
Diffusion brazing connection. (a) Schematic illustration of a copper pipe i...
Available to Purchase
in Case Studies of Induction Heating
> Handbook of Induction Soldering: Principles, Processing, and Applications
Published: 31 December 2024
Fig. 11.47 Diffusion brazing connection. (a) Schematic illustration of a copper pipe in an aluminum pipe. (b) Cross section showing the assembly of the two pipes. (c) Brazed connection
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Image
Plot of shear strength as a function of brazing temperature for diffusion-b...
Available to PurchasePublished: 01 August 2005
Fig. 6.2 Plot of shear strength as a function of brazing temperature for diffusion-brazed assemblies, each comprising a foil of copper plated on both sides with a 2 μm (80 μin.) thick layer of tin sandwiched between copper-plated CuCrZr test pieces. The assembly was held for 5 min
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Image
Schematic illustration of the steps involved in making a diffusion-brazed j...
Available to PurchasePublished: 01 August 2005
Image
Patterned, plated, and stacked sheets, aligned in a jig ready for applicati...
Available to PurchasePublished: 01 August 2005
Fig. 6.9 Patterned, plated, and stacked sheets, aligned in a jig ready for application of the compressive load and diffusion brazing in a vacuum oven. The diffusion brazing conditions were a compressive stress of 3 MPa (440 psi) and a process temperature of 820 °C (1510 °F), sustained for 10 h.
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Image
Published: 01 August 2005
Fig. 6.6 Nomograph based on Eq 6.1 in the text defining the relationship between brazing time ( t ), tin thickness ( W o ), and the diffusivity ( D α ¯ ) of the solute in the base metal, according to the model of Tuah-Poku, Dollar, and Massalski 1988 [adapted from MacDonald
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Book Chapter
History of Brazing
Available to PurchaseBook: Principles of Brazing
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.pb.t5123000x
EISBN: 978-1-62708-351-5
... century, it acquired the meaning “solder with an alloy of copper and zinc,” i.e., essentially its present connotation, including the original precious metal origins. An early application of diffusion brazing, known as Sheffield plate, was developed by Thomas Bolsover in 1743 [ Bradbury 1912...
Abstract
This chapter briefly reviews the history of brazing from ancient times to the early 20th century.
Image
Single sheet of copper patterned by photochemical etching to contain a sing...
Available to PurchasePublished: 01 August 2005
Fig. 6.8 Single sheet of copper patterned by photochemical etching to contain a single plan section through six heat exchanger modules. To achieve the total component height, 185 identical sheets were required. The diffusion braze, in this case, 2 μm (8 μin.) of tin, was applied to both sides
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Image
Diffusion process resulting in loss of identity of original brazed joint. S...
Available to PurchasePublished: 01 November 2011
Fig. 7.9 Diffusion process resulting in loss of identity of original brazed joint. Source: Ref 7.9
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Book Chapter
Direct Brazing of Nonmetals
Available to PurchaseBook: Principles of Brazing
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.pb.t51230221
EISBN: 978-1-62708-351-5
... in character and conducive to metallic bonding. Therefore, in brazing to nonmetals, diffusion and chemical reaction are inextricably linked to wetting and spreading by the filler. The interaction between a braze and a nonmetal can take one of two forms. It may be classified as either chemical bonding...
Abstract
This chapter discusses the processes involved in the wetting, spreading, and chemical interaction of a braze on a nonmetal. The chapter reviews the key materials and process issues relating to the joining of nonmetals using active brazing. Emphasis is placed on the differences in brazing to metals by established methods. The chapter also describes the designing process and properties of metal/nonmetal joints.
Book Chapter
Brazing and Soldering
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 01 November 2011
DOI: 10.31399/asm.tb.jub.t53290165
EISBN: 978-1-62708-306-5
... metal. The composition and surface energy of liquids and solids are assumed to remain constant. In real systems, however, these interactions occur: Alloy formation between liquid and base metal Diffusion of base metal into brazing filler metal Diffusion of filler metal into grains...
Abstract
Brazing and soldering processes use a molten filler metal to wet the mating surfaces of a joint, with or without the aid of a fluxing agent, leading to the formation of a metallurgical bond between the filler and the respective components. This chapter discusses the characteristics, advantages, and disadvantages of brazing and soldering. The first part focuses on the fundamentals of the brazing process and provides information on filler metals and specific brazing methods. The soldering portion of the chapters provides information on solder alloys used, selection criteria for base metal, the processes involved in precleaning and surface preparation, types of fluxes used, solder joint design, and solder heating methods.
Book Chapter
Introduction
Available to PurchaseBook: Principles of Soldering
Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2004
DOI: 10.31399/asm.tb.ps.t62440001
EISBN: 978-1-62708-352-2
... of these joining methods. It presents a comparison between solders and brazes. Further details on pressure welding and diffusion bonding are also provided. Key parameters of soldering are discussed, including surface energy and surface tension, wetting and contact angle, fluid flow, filler spreading...
Abstract
Soldering and brazing represent one of several types of methods for joining solid materials. These methods may be classified as mechanical fastening, adhesive bonding, soldering and brazing, welding, and solid-state joining. This chapter summarizes the principal characteristics of these joining methods. It presents a comparison between solders and brazes. Further details on pressure welding and diffusion bonding are also provided. Key parameters of soldering are discussed, including surface energy and surface tension, wetting and contact angle, fluid flow, filler spreading characteristics, surface roughness of components, dissolution of parent materials and intermetallic growth, significance of the joint gap, and the strength of metals. The chapter also examines the principal aspects related to the design and application of soldering processes.
Book Chapter
Solid-State Welding and Bonding
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 01 November 2011
DOI: 10.31399/asm.tb.jub.t53290137
EISBN: 978-1-62708-306-5
... Abstract Solid-state welding processes are those that produce coalescence of the faying surfaces at temperatures below the melting point of the base metals being joined without the addition of brazing or solder filler metal. This chapter discusses solid-state welding processes such as diffusion...
Abstract
Solid-state welding processes are those that produce coalescence of the faying surfaces at temperatures below the melting point of the base metals being joined without the addition of brazing or solder filler metal. This chapter discusses solid-state welding processes such as diffusion welding, forge welding, roll welding, coextrusion welding, cold welding, friction welding, friction stir welding, explosion welding, and ultrasonic welding.
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.pb.9781627083515
EISBN: 978-1-62708-351-5
Book Chapter
Introduction
Available to PurchaseBook: Principles of Brazing
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.pb.t51230001
EISBN: 978-1-62708-351-5
..., brazed and soldered joints often can be endowed with the advantageous mechanical properties of welded and diffusion-bonded joints; at the same time, in most cases they can be disassembled readily, without detriment to the components, like mechanically fastened joints. These features make brazing...
Abstract
Brazing and soldering jointly represent one of several methods for joining solid materials. This chapter summarizes the principal characteristics of the various joining methods. It then discusses key parameters of brazing including surface energy and tension, wetting and contact angle, fluid flow, filler spreading characteristics, surface roughness of components, dissolution of parent materials, new phase formations, significance of the joint gap, and the strength of metals. The chapter also describes issues in processing aspects that must be considered when designing a joint, and the health, safety, and environmental aspects of brazing.
Book Chapter
Joining Technology and Practice
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280149
EISBN: 978-1-62708-267-9
...). Intermediate layers are essential to most diffusion bonding operations. The interlayer may be different from any of the basis metals/alloys. Brazing relies on the melting and subsequent solidification of an interlayer (braze metal) without any melting of the basis metals. Joining Superalloys...
Abstract
Superalloys, except those with high aluminum and titanium contents, are welded with little difficulty. They can also be successfully brazed. This chapter describes the welding and brazing processes most often used and the factors that must be considered when making application decisions. It discusses the basic concepts of fusion welding and the differences between solid-solution-hardened and precipitation-hardened wrought superalloys. It addresses joint integrity, design, weld-related cracking, and the effect of grain size, precipitates, and contaminants. It covers common fusion welding techniques, defect prevention, fixturing, heat treatments, and general practices, including the use of filler metals. It also discusses several solid-state welding methods, superplastic forming, and transient liquid phase bonding, a type of diffusion welding process. The chapter includes extensive information on brazing processes, atmospheres, filler metals, and surface preparation procedures. It also includes examples of nickel-base welded components for aerospace use.
Book Chapter
Welding
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560309
EISBN: 978-1-62708-291-4
... the steel, and the central portions of some of them remain as islands in the filler metal. Diffusion of copper into the steel has also occurred; this is evidenced by the dark-etching band in the steel adjacent to the joint interface. The third example, given in Fig. 11.2(c) and (d) , is a braze weld...
Abstract
This chapter examines the effects of welding on the structure of metal, particularly the changes induced in the isothermal regions adjacent to the weld. It presents more than 150 images identifying structures and features associated with fusion and solid-state welding processes, including electroslag, TIG, gas, electron-beam, and arc welding as well as vacuum diffusion, forge, friction, electrical-resistance, and explosive welding. It also discusses the effect of welding temperature, pressure, and composition on the transformations that occur in and around the weld, and it includes a short section on brazing and braze welding.
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