China
Africa
Explore chapters and articles related to this topic
Joining Technologies
Published in Raghu Echempati, Primer on Automotive Lightweighting Technologies, 2021
Brazing is a joining method which provides a permanent bond between the parts to be joined with the help of a brazing filler metal. The composition of the filler alloy is such that its melting point is slightly below the melting range of the parent metal of the parts. Brazing is distinguished from welding by the fact that the parent metal does not melt during the process. Brazing differs from soldering because the brazing filler metal is an aluminum base alloy and the working temperatures for soldering are appreciably lower.
Soldering, brazing and welding
Published in Andrew Livesey, Bicycle Engineering and Technology, 2020
There is a distinction between the brazing of aluminium and the brazing of other metals. For aluminium, the brazing alloy is one of the aluminium alloys having a melting point below that of the parent metal. For other metals, the brazing alloys are often based on copper–zinc alloys (brasses — hence the term brazing) and are necessarily dissimilar in composition to the parent metal.
Joining of Metals
Published in Sherif D. El Wakil, Processes and Design for Manufacturing, 2019
The main difference between soldering and brazing is the melting point of the filler metal in each case. Soft solders used in soldering have melting points below 930°F (500°C) and produce joints with relatively low mechanical strength, whereas hard solders (brazing metals) have higher melting points, up to 1650°F (900°C), and produce joints with high mechanical strength.
Additive manufacturing of bimetallic structures
Published in Virtual and Physical Prototyping, 2022
Amit Bandyopadhyay, Yanning Zhang, Bonny Onuike
A bimetallic structure could be processed using conventional or additive manufacturing (AM) methods, as shown in Figure 2. Welding and brazing techniques are probably the most commonly used conventional methods for joining two different metallic materials. Different welding techniques such as arc welding, explosion welding, laser butt welding, and friction stir welding can be applied for joining (Nandan, DebRoy, and Bhadeshia 2008; Rai et al. 2011; Mishra et al. 2008; Velu and Bhat 2015; Fallahi et al. 2017; Casalino et al. 2017; Liu, Jia, and Xuan 2017; Zu, Sun, and Zhang 2017; Ning et al. 2017). Although welding techniques to join two metallic materials is economical, there are still some critical issues for bimetallic structures, such as leading a sizeable heat-affected zone (HAZ) at the joint and cracking due to brittle intermetallic phase formation, especially for joining two dissimilar metals. Brazing, a liquid–solid-state bonding process, is performed at a lower temperature than welding. This process is used with filler (braze) metal to join wide varieties of dissimilar metals with improved bonding strength. Diffusion bonding is increasingly used to join difficult-to-bond combinations of materials, such as immiscible dissimilar metals, metals to ceramics combinations, by applying pressure and heat at joining surfaces where the strength of the diffusion-bonded joint is a function of plastic deformation.
High-temperature brazing of structural elements for the first wall of the DEMO reactor with rapidly hardened tungsten and steel alloys-solders
Published in Welding International, 2019
D.M. Bachurina, A.N. Suchkov, Yu.A. Gurova, O.N. Sevryukov
Thus, the problem of joining steel to tungsten for structures of the DEMO thermonuclear reactor has not yet been solved, and is now urgent. The present work examines the use of high-temperature brazing with rapidly quenched ribbon brazing alloys, and examines the use of a vanadium spacer for stress compensation. High-temperature brazing technology makes it possible to obtain strong joints in various materials, with any joint geometry, and this technology also makes it possible to carry out the joining process together with heat treatment of the base materials. Amorphous and nanocrystalline ribbons, obtained by the technology of super-rapid quenching of the melt on a rapidly rotating copper disk, are actively being used for high-temperature brazing. This production process makes it possible to obtain ductile, flexible ribbons with fixed geometric parameters from difficult deformable brittle alloys. Brazing alloys produced by this technology possess a number of advantages: increased capillary activity, homogeneity, adhesion, and uniform fusion throughout the volume in the brazing process because they are in an amorphous or nanocrystalline state. Taking into account that high-temperature brazing with these materials is used in the production of the diverter and the first wall of ITER, its use in DEMO is promising.
A comparative study of technical aspects of resistance spot brazed and resistance spot welded joints
Published in Welding International, 2022
When joining dissimilar metals, Brazing has an important benefit. A powerful joint can be produced with minimal modification of base metal characteristics, as long as the filler material is metallurgically compatible with both base metals and has a smaller melting point. In brazing, it is usually base metal elements that diffuse from opposite sides to a thin region of molten filler metal. The heated elements interact and form precipitates and intermetallic compounds that harden into distinct layers across the resulting junction (Figure 5) [29].