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dissimilar metals
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Published: 01 January 2000
Image
in Stainless Steels
> Metallography of Steels: Interpretation of Structure and the Effects of Processing
Published: 01 August 2018
Fig. 16.17 Example of a hot crack in the heat-affected zone of a dissimilar metals weld (an engineering steel— Chapter 15, “Engineered Special Bar Quality Steel (Engineered Steels),” in this book—and a stainless steel). The crack propagates through the last region to solidify. The crack
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Book Chapter
Book: Corrosion of Weldments
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...
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 welding, explosion welding, friction welding, or ultrasonic welding), brazing, or soldering where alloying between the metals is normally insignificant. This chapter describes the factors influencing joint integrity and discusses the corrosion behavior of dissimilar metal weldments.
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Published: 01 December 2018
Image
in Life Prediction for Boiler Components
> Damage Mechanisms and Life Assessment of High-Temperature Components
Published: 01 December 1989
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in Life Prediction for Boiler Components
> Damage Mechanisms and Life Assessment of High-Temperature Components
Published: 01 December 1989
Fig. 5.5. Relative performance of dissimilar-metal welds made with different commercial filler metals and having different geometries under accelerated discriminatory testing ( Ref 5 ).
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in Life Prediction for Boiler Components
> Damage Mechanisms and Life Assessment of High-Temperature Components
Published: 01 December 1989
Fig. 5.36. Structure-coarsening kinetics for type I carbides in a dissimilar-metal weld (nickel-base filler metal, 2¼Cr-1Mo steel base metal) ( Ref 52 and 63 ).
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Image
Published: 01 November 2011
Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2011
DOI: 10.31399/asm.tb.jub.t53290279
EISBN: 978-1-62708-306-5
... Abstract This chapter reviews materials issues encountered in joining, including challenges involved in welding of dissimilar metal combinations; joining of plastics by mechanical fastening, solvent and adhesive bonding, and welding; joining of thermoset and thermoplastic composite materials...
Abstract
This chapter reviews materials issues encountered in joining, including challenges involved in welding of dissimilar metal combinations; joining of plastics by mechanical fastening, solvent and adhesive bonding, and welding; joining of thermoset and thermoplastic composite materials by mechanical fastening, adhesive bonding, and, for thermoplastic composites, welding; the making of glass-to-metal seals; and joining of oxide and nonoxide ceramics to themselves and to metals by solid-state processes and by brazing. The classification, types, applications, and the mechanism of each of these methods are covered. The factors influencing joint integrity and the main considerations in welding dissimilar metal combinations are also discussed.
Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 1997
DOI: 10.31399/asm.tb.wip.t65930329
EISBN: 978-1-62708-359-1
... the various types and general weldability of age-hardened nickel-base alloys. The article then discusses the composition, welding metallurgy, and properties of cast nickel-base superalloys. Finally, it provides information on the welding of dissimilar metals, filler metal selection for welding clad materials...
Abstract
Nickel-base alloys are generally used in harsh environments that demand either corrosion resistance or high-temperature strength. This article first describes the general welding characteristics of nickel-base alloys. It then describes the weldability of solid-solution nickel-base alloys in terms of grain boundary precipitation, grain growth, and hot cracking in the heat-affected zone; fusion zone segregation and porosity; and postweld heat treatments. Next, the article analyzes the welding characteristics of dissimilar and clad materials. This is followed by sections summarizing the various types and general weldability of age-hardened nickel-base alloys. The article then discusses the composition, welding metallurgy, and properties of cast nickel-base superalloys. Finally, it provides information on the welding of dissimilar metals, filler metal selection for welding clad materials and for overlay cladding, service conditions during repair, and welding procedural idiosyncrasies of cobalt-base alloys.
Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940271
EISBN: 978-1-62708-302-7
..., stress corrosion cracking, and corrosion fatigue. It describes the underlying mechanisms associated with each process and how they relate to the microstructure of the metal or alloy, the physical condition of the surface, and other factors such as the coupling of the metal to a dissimilar metal...
Abstract
This chapter is a detailed study of the localized corrosion behavior of steel, copper, and aluminum alloys. It applies the basic principles of electrochemistry, as well as materials science and solid and fluid mechanics, to explain the causes and effects of pitting, crevice corrosion, stress corrosion cracking, and corrosion fatigue. It describes the underlying mechanisms associated with each process and how they relate to the microstructure of the metal or alloy, the physical condition of the surface, and other factors such as the coupling of the metal to a dissimilar metal or surface film.
Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430149
EISBN: 978-1-62708-253-2
... rupture, including overheating, high-temperature creep, graphitization, and dissimilar metal welds. It explains how to determine which mechanisms are in play by interpreting fracture patterns and microstructural details. It also describes the investigation of several carbon and low-alloy steel tubes...
Abstract
Boiler tubes operating at high temperatures under significant pressure are vulnerable to stress rupture failures. This chapter examines the cause, effect, and appearance of such failures. It discusses the conditions and mechanisms that either lead to or are associated with stress rupture, including overheating, high-temperature creep, graphitization, and dissimilar metal welds. It explains how to determine which mechanisms are in play by interpreting fracture patterns and microstructural details. It also describes the investigation of several carbon and low-alloy steel tubes that failed due to stress rupture.
Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030019
EISBN: 978-1-62708-282-2
... nonmetal in the same electrolyte. The three essential components are: Materials possessing different surface potential A common electrolyte A common electrical path When dissimilar metals or alloys in a common electrolyte are electrically isolated from each other, they do not experience...
Abstract
This chapter provides a brief account of galvanic corrosion, which occurs when a metal or alloy is electrically coupled to another metal or conducting nonmetal in the same electrolyte. It begins by describing the galvanic series of metals and alloys useful for predicting galvanic relationships, followed by a brief section on polarization of metals or alloys. The effects of area, distance, and geometric shapes on galvanic-corrosion behavior are then discussed. Various alloys susceptible to galvanic corrosion are briefly reviewed. The chapter also discusses various modes of attack that lead to galvanic corrosion, along with methods for predicting and controlling galvanic corrosion.
Image
in Life Prediction for Boiler Components
> Damage Mechanisms and Life Assessment of High-Temperature Components
Published: 01 December 1989
Fig. 5.35. Schematic illustration of an array of type I carbides near the interface in a dissimilar-metal weld (nickel-base weld metal, low-alloy steel base metal) and the relevant structure parameters ( Ref 52 and 63 ).
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Image
in Life Prediction for Boiler Components
> Damage Mechanisms and Life Assessment of High-Temperature Components
Published: 01 December 1989
Fig. 5.19. Use of statistics of past failures to predict future failure rates ( Ref 31 ). Based on experience reported by the Central Electricity Generating Board (U.K.) with dissimilar-metal fusion welds in 2¼Cr-1Mo steel tubes ( Ref 32 ). Data are for 9474 welds made with austenitic filler
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Image
Published: 01 January 2000
Fig. 17 Current measurement to determine the galvanic corrosion rate between dissimilar metals. Source: NACE International
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Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2012
DOI: 10.31399/asm.tb.lmub.t53550141
EISBN: 978-1-62708-307-2
... Abstract Magnesium, by volume, is two-thirds the weight of aluminum and one-quarter the weight of steel. It also has good damping capacity, giving it an edge over other metals in high-vibration environments. This chapter discusses the basic metallurgy, alloy designations, compositions...
Abstract
Magnesium, by volume, is two-thirds the weight of aluminum and one-quarter the weight of steel. It also has good damping capacity, giving it an edge over other metals in high-vibration environments. This chapter discusses the basic metallurgy, alloy designations, compositions, and mechanical properties of cast and wrought magnesium alloys. It also describes the processes used to produce magnesium parts, the causes and effects of corrosion, and the use of protective coatings and treatments.
Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2001
DOI: 10.31399/asm.tb.aub.t61170003
EISBN: 978-1-62708-297-6
... as easier to cast, weld, form, and machine. It also discusses some of the alloying techniques that have been developed to address problems stemming from dissimilarities between the base metal and alloying or inoculate material. alloying mechanical properties Introduction and Overview Metals...
Abstract
This article discusses the general purpose of alloying and identifies some of the material properties and behaviors that can be improved by adding various elements to the base metal. It explains how alloying can make metals stronger and more resistant to corrosion and wear as well as easier to cast, weld, form, and machine. It also discusses some of the alloying techniques that have been developed to address problems stemming from dissimilarities between the base metal and alloying or inoculate material.
Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430147
EISBN: 978-1-62708-253-2
...: Overheating Long-term overheating Short-term overheating High-temperature creep Graphitization Dissimilar metal welds (DMW) Water-side corrosion: General corrosion/oxidation damage Under-deposit corrosion Hydrogen damage Caustic corrosion/caustic gouging Phosphate...
Abstract
This chapter provides an outline of the failure modes and mechanisms associated with most boiler tube failures in coal-fired power plants. Primary categories include stress rupture failures, water-side corrosion, fire-side corrosion, fire-side erosion, fatigue, operation failures, and insufficient quality control.
Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2011
DOI: 10.31399/asm.tb.jub.t53290001
EISBN: 978-1-62708-306-5
... on joint design. When perfectly clean surfaces are brought into intimate contact, interatomic bonds form a joint. Bond strength is greatest when the mating metals are mutually soluble, but good bonds can be obtained with dissimilar, not otherwise weldable metals and with highly differing thicknesses. When...
Abstract
Joining comprises a large number of processes used to assemble individual parts into a larger, more complex component or assembly. The selection of an appropriate design to join parts is based on several considerations related to both the product and the joining process. Many product design departments now improve the ease with which products are assembled by using design for assembly (DFA) techniques, which seek to ensure ease of assembly by developing designs that are easy to assemble. This chapter discusses the general guidelines for DFA and concurrent engineering rules before examining the various joining processes, namely fusion welding, solid-state welding, brazing, soldering, mechanical fastening, and adhesive bonding. In addition, it provides information on several design considerations related to the joining process and selection of the appropriate process for joining.