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diffusion welding

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Published: 01 July 1997
Fig. 12 Three-stage mechanistic model of diffusion welding. (a) Initial asperity contact. (b) First-stage deformation and interfacial boundary formation. (c) Second-stage grain boundary migration and pore elimination. (d) Third-stage volume diffusion and pore elimination. Source: Ref 7 More
Image
Published: 01 August 1999
Fig. 11.3 (Part 1) Diffusion welds, (a) to (d) 0.1% C (0.12C-0.03SiO.62Mn, wt%). (a) Bonded at 900 °C under a pressure of 7 N/mm 2 for 2 min. Arrows indicate the locations of the weld planes. 2% nital. 200×. (b) Bonded at 900 °C under a pressure of 7 N/mm 2 for 120 min. Arrows More
Image
Published: 01 December 2000
Fig. 9.11 Diffusion welds in hollow fan hub for a gas turbine engine More
Series: 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...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280149
EISBN: 978-1-62708-267-9
... 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...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2006
DOI: 10.31399/asm.tb.cw.t51820169
EISBN: 978-1-62708-339-3
... Abstract Many factors must be considered when welding dissimilar metals, and adequate procedures for the various metals and sizes of interest for a specific application must be developed and qualified. Most combinations of dissimilar metals can be joined by solid-state welding (diffusion...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 1997
DOI: 10.31399/asm.tb.wip.t65930057
EISBN: 978-1-62708-359-1
.... The destructiveness and/or inadequacy of these common inspection methods has long been recognized, and as a result, nondestructive methods have been extensively studied. The pulse-echo ultrasonic inspection of spot welds is now feasible. Diffusion Welding Diffusion welding (also known as diffusion bonding...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.ttg2.t61120065
EISBN: 978-1-62708-269-3
... for diffusion bonding. The interlayer invariably will be a different alloy than the pieces being bonded. Brazing relies on the melting and subsequent solidification of an interlayer (braze metal) without any melting of the base metal. Most fabrication welding on titanium and its alloys is on wrought...
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...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 1997
DOI: 10.31399/asm.tb.wip.t65930311
EISBN: 978-1-62708-359-1
..., structure or properties due to such compositional segregation is generally not significant in titanium alloys due to the limited extent of segregation of common alloying elements and the appreciable diffusional homogenization of alloying elements during weld cooling through the beta phase field...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230401
EISBN: 978-1-62708-298-3
..., and testing. beryllium alloys beryllium bonding brazing soldering welding BERYLLIUM has been successfully joined by fusion welding, brazing, solid-state bonding (diffusion bonding and deformation bonding), and soldering. These different processes are described, and the advantages...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2022
DOI: 10.31399/asm.tb.dsktmse.t56050001
EISBN: 978-1-62708-432-1
... distance x , and the intensity of the isotope is measured. With this data, the concentration of the isotope ( C A ) is plotted against x 2 , and the slope (1/4 Dt ) will give the value of the diffusion coefficient D . Diffusion Bonding The process of welding is broadly classified...
Book Chapter

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...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130503
EISBN: 978-1-62708-284-6
...: Diffusible hydrogen content Yield strength Hardness Carbon equivalent Thickness Restraint Susceptible microstructure Cracking can take place in either the weld metal or the HAZ, depending on which is more susceptible. Generally, the peak hardness, strength, and carbon equivalent...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2011
DOI: 10.31399/asm.tb.jub.t53290001
EISBN: 978-1-62708-306-5
... a circular or near-circular cross section. Diffusion bonding is a solid-state welding process that allows joining of a variety of structural materials, both metals and nonmetals. However, diffusion bonding requires an extremely smooth surface finish to provide intimate surface contact, a high temperature...
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
..., 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...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2022
DOI: 10.31399/asm.tb.dsktmse.9781627084321
EISBN: 978-1-62708-432-1
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 1997
DOI: 10.31399/asm.tb.wip.t65930003
EISBN: 978-1-62708-359-1
... at the alloy composition ( C 0 ), D L is the solute diffusion coefficient in liquid, and R is the solidification front growth rate. Equations 1 and 2 define the conditions for the development of various solidification substructures in welds. This concept of constitutional supercooling...
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 November 2011
DOI: 10.31399/asm.tb.jub.t53290279
EISBN: 978-1-62708-306-5
... welding (diffusion welding, explosion welding, friction welding, or ultrasonic welding), brazing, or soldering where alloying between the metals is normally insignificant. In these cases, only the differences in the physical and mechanical properties of the base metals and their influence...