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postbraze heat treatment
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Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001455
EISBN: 978-1-62708-173-3
...), flux removal techniques, and postbraze heat treatment processes. It concludes with information on the safety precautions to be followed during the brazing process. aluminum alloys brazing chloride-active fluxes dip brazing fluoride-active fluxes flux removal techniques fluxless vacuum...
Abstract
Aluminum, a commonly used base material for brazing, can be easily fabricated by most manufacturing methods, such as machining, forming, and stamping. This article outlines non-heat-treatable wrought alloys typically used as base metals for the brazing process. It highlights chloride-active and fluoride-active types of fluxes that are used for torch, furnace, or dip brazing processes. The article explains the steps to be performed, including the designing of joints, preblaze cleaning, assembling, brazing techniques (dip brazing, furnace and torch brazing, fluxless vacuum brazing), flux removal techniques, and postbraze heat treatment processes. It concludes with information on the safety precautions to be followed during the brazing process.
Book: Corrosion: Materials
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003831
EISBN: 978-1-62708-183-2
... and degasses the assemblies before brazing. In addition, the use of flux is usually not required, thus reducing the cleaning and flux-removal operation after the brazing operation. Many times, the negative effects of the brazing process can be eliminated or minimized by a proper postbraze heat treatment...
Abstract
Corrosion is often thought of as rusting, the process of deterioration undergone by a metal when it is exposed to air or water. This article provides the fundamentals of joints corrosion and primarily addresses the various forms of corrosion observed in brazed and soldered joints and their causes. It describes the role of proper brazing procedures in controlling corrosion. The article concludes with information on the corrosion resistance of various brazing alloy systems.
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001386
EISBN: 978-1-62708-173-3
... unskilled operators can carry out everyday manufacturing operations. The absence of flux entrapment allows more flexibility in joint design. The postbraze cleaning of the brazed part and the furnace are unnecessary. Because a whole assembly is heated, distortion of the parts can be minimized...
Abstract
Furnace brazing is a mass production process for joining the components of small assemblies with a metallurgical bond, using a nonferrous filler metal as the bonding material and a furnace as the heat source. This article presents the advantages and limitations of the furnace brazing and reviews three types of furnaces: continuous, semi-continuous, and batch. It presents three examples of the industrial applications of the furnace brazing: vacuum devices, jet engines, and automotive industries. The health and safety guidelines to be followed during the furnace brazing are also discussed.
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0009239
EISBN: 978-1-62708-173-3
... 50 °C (preferably at least 100 °C) below the brazing temperature in order to prevent remelting the joint metal. It is recommended that postbrazing heat treatment be done during cooling, within the same brazing thermal cycle, because any additional thermal cycles cause a greater chance of unexpected...
Abstract
This article discusses the effects of brazing temperature and thermal treatment on structure and mechanical behavior of different classes of titanium base metals such as commercially pure (CP) titanium, alpha or near-alpha alloys, alpha-beta alloys, and beta alloys. The classification, properties, and potential heat treatment of titanium base alloys are presented in tables. The article provides information on brazed joints of titanium with carbon steels, as well as ceramics and graphite. It discusses the risks involved in titanium brazing, including erosion of base metal, brittle intermetallics, and low ductility. The article reviews induction and torch brazing, infrared brazing, diffusion brazing, and brazing by heating with ion bombardment. It concludes by describing the design criteria and limitations of brazing.
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001456
EISBN: 978-1-62708-173-3
... temperatures. Other high-temperature brazing filler alloys are Ti-65V (brazing temperature of 1700 °C, or 3090 °F) and V-50Mo (brazing temperature of 2257 °C, or 4095 °F). After postbraze diffusion treatment, shear test specimens failed in the parent metal when tested at 1400 °C (2550 °F). Additions...
Abstract
This article provides a discussion on filler metal selection, brazing procedures, and brazing equipment for brazing refractory metals. These include molybdenum, tungsten, niobium, and tantalum, and reactive metals. Commercially pure and alpha titanium alloys, alpha-beta alloys, zirconium alloys, and beryllium alloys are some reactive metals discussed in the article.
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006828
EISBN: 978-1-62708-329-4
... cracking by these phenomena are included in Failure Analysis and Prevention , Volume 11 of the ASM Handbook , 2020). Reduction of cost and increase in production rate has led to fabricating with materials that have residual stresses from heat treatment and fabrication. It is no longer common practice...
Abstract
The various methods of furnace, torch, induction, resistance, dip, and laser brazing are used to produce a wide range of highly reliable brazed assemblies. However, imperfections that can lead to braze failure may result if proper attention is not paid to the physical properties of the material, joint design, prebraze cleaning, brazing procedures, postbraze cleaning, and quality control. Factors that must be considered include brazeability of the base metals; joint design and fit-up; filler-metal selection; prebraze cleaning; brazing temperature, time, atmosphere, or flux; conditions of the faying surfaces; postbraze cleaning; and service conditions. This article focuses on the advantages, limitations, sources of failure, and anomalies resulting from the brazing process. It discusses the processes involved in the testing and inspection required of the braze joint or assembly.
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001453
EISBN: 978-1-62708-173-3
.... It is possible to perform annealing heat treatments on diffusion brazed joints that result in the diffusion of the boron out of the brazed joint and into the base metal. The result is a brazed joint in which intermetallic phases are partially dissolved or eliminated completely ( Fig. 1 ). Diffusion heat...
Abstract
This article focuses primarily on the various steps involved in the brazing of heat-resistant alloys (nickel- and cobalt-base alloys). The major steps include the selection of brazing filler metals, surface cleaning and preparation, brazing processes and their corresponding atmospheres, and fixturing. The article also provides an overview of the brazing of blow-alloy steels and tool steels and oxide dispersion-strengthened alloys.
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006302
EISBN: 978-1-62708-179-5
... by capillary flow. It is extremely important to review the impact of high-temperature furnace brazing on the structure and properties of cast iron brazements. Postbrazing heat treatment may be required to restore the desired mechanical properties. Service Conditions Temperature and environment...
Abstract
Brazing and soldering are done at temperatures below the solidus temperature of the base material but high enough to melt the filler metal and allow the liquid filler metal to wet the surface and spread into the joint gap by capillary action. This article discusses the common advantages of both brazing and soldering. It describes the brazing and soldering of cast irons, as well as the selection of brazing filler material. The article discusses various brazing methods: torch brazing, induction brazing, salt-bath brazing, and furnace brazing. It concludes with information on the application examples of brazing of cast iron.
Book Chapter
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003210
EISBN: 978-1-62708-199-3
... kg (5 lb). Much larger assemblies can be brazed in specially built furnaces; the size of assemblies is limited by the heat required to bring them to the brazing temperature. The brazing temperature, which is considerably higher than those employed in heat treatment of steel, imposes limitations...
Abstract
This article provides information about the selection of brazing processes and filler metals and describes the brazing (heating) methods, including manual torch brazing, furnace brazing, induction brazing, dip brazing, resistance brazing and specialized brazing processes such as diffusion and exothermic brazing. The article explains joint design, filler materials, fuel gases, equipment, and fluxes in the brazing methods. The article also describes the brazing of steels, stainless steels, cast irons, heat-resistant alloys, aluminum alloys, copper and copper alloys, and titanium and titanium alloys.
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.9781627081993
EISBN: 978-1-62708-199-3