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vacuum brazing

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Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280135
EISBN: 978-1-62708-267-9
... considerations, including heating and cooling rates for wrought and cast superalloys and combined treatments such as solution annealing and vacuum brazing. annealing precipitation hardening stress relieving superalloys Introduction Why Heat Treat? All superalloys, whether precipitation...
Image
Published: 01 August 2005
Fig. 4.23 (a) Test piece used to determine the propensity for void formation as a function of joint dimensions. In this case, the components are an aluminum engineering alloy (AlMn1), joined by fluxless, vacuum brazing, using the Al-12Si braze, which is admitted to the joint gap in the form More
Image
Published: 01 August 2005
Fig. 7.33 Effect of test temperature on the tensile strength of alumina/aluminum/alumina samples vacuum brazed at 1000 °C (1830 °F). Thin joints are more resilient to elevated-temperature service than thick joints where the braze is unconstrained by the ceramic components. More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280149
EISBN: 978-1-62708-267-9
... 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...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.pb.t51230105
EISBN: 978-1-62708-351-5
... operation in air or other oxidizing environments. Fig. 3.1 Interrelationship of joining atmospheres Two distinct types of atmosphere are used for brazing: Chemically inert gas atmospheres (e.g., argon, nitrogen, helium, vacuum). These function by excluding oxygen and other gaseous...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2011
DOI: 10.31399/asm.tb.jub.t53290165
EISBN: 978-1-62708-306-5
... such as vacuum, may provide the essential surface wetting. Joint Design and Clearance Small clearances are used because the smaller the clearance, the easier it is for capillarity to distribute the brazing filler metal throughout the joint area and the less likely it is that voids or shrinkage cavities...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230401
EISBN: 978-1-62708-298-3
... Abstract Beryllium has been successfully joined by fusion welding, brazing, solid-state bonding, and soldering. This chapter describes these processes in detail along with their advantages and disadvantages. It also addresses application considerations such as surface preparation, joint design...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560309
EISBN: 978-1-62708-291-4
..., 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...
Image
Published: 01 August 2005
Fig. 1.18 Wettability index (defined as the product of the contact angle and spread area [ Feduska 1959 ]) of silver-base brazes on 316L stainless steel, heated in vacuum for 5 min. Palladium additions clearly have a beneficial effect on wetting and spreading by the braze, despite widening More
Image
Published: 01 August 2005
Fig. 7.14 Wettability (contact angle) and room temperature strength of alumina brazed with copper containing varying amounts of titanium, prepared by brazing in vacuum at 1150 °C (2100 °F) for 15 min More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2001
DOI: 10.31399/asm.tb.aub.t61170550
EISBN: 978-1-62708-297-6
... other silver-base brazing alloys are applicable as well. Vacuum brazing grades, BVAg- x , are also available. These filler metals have maximum contents specified for a number of impurities—notably cadmium, phosphorus, and zinc—and have high vapor pressures. Nominal composition and solidification...
Image
Published: 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. More
Image
Published: 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 More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.pb.t51230047
EISBN: 978-1-62708-351-5
... to the service environment, in terms of corrosion and oxidation resistance and compatibility with vacuum, in accordance with functional requirements. Zinc-containing brazes are particularly restrictive in this regard. The filler must be compliant with statutory needs. These include hallmarking regulations...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.ttg2.t61120065
EISBN: 978-1-62708-269-3
... cooling associated with fusion welding must be conducted in completely inert or vacuum environments. Similarly, the temperatures and times used for solid-state bonding or for brazing require that processing be conducted in an inert or vacuum environment. Open-air techniques can be used with fusion...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.pb.t51230001
EISBN: 978-1-62708-351-5
... 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...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.pb.t51230221
EISBN: 978-1-62708-351-5
... for the joining atmosphere to be highly inert so as to prevent the formation of nonmetallic films or skins on the surface of the braze, which will defeat the intended role of the active constituent. A vacuum of 10 mPa (10 –6 psi) is normally required to achieve this condition. Other atmospheres that have been...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.pb.9781627083515
EISBN: 978-1-62708-351-5
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.pb.t51230143
EISBN: 978-1-62708-351-5
... Abstract This chapter considers the role of materials in brazing operations and the manner in which they impact on the choice of processing conditions and their optimization. The concepts covered are metallurgical and mechanical constraints, and constraints imposed by the components...
Image
Published: 01 November 2011
Fig. 7.6 Typical construction of horizontal side-loaded cold-wall vacuum furnace, which is ideal for brazing of small assemblies that can be placed in stacked baskets or on tiers of work grids. Source: Ref 7.1 More