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English , how many search results you wish to have shown per page e. Used to throttle request rate. Contains campaign related information for the user. In addition, American universities have been very slow in developing brazing programs. In fact, the topic is not included in most curriculums that cover joining processes. While some schools, such as the University of Kentucky Lexington, KY , actively conduct brazing research, the only university that currently offers a degree in brazing is in Europe-the Aachen University of Technology Aachen, Germany.
Brazing offers many advantages that make it an attractive joining process. For instance, a brazed joint can offer strength equal to or greater than that of the base metals themselves. Brazed joints are ductile and can withstand considerable shock and vibration.
Brazing is performed at relatively low temperatures, reducing the possibility of warping, overheating or melting the metals being joined. It allows simple fit up and easy disassembly without the need for additional components like nuts, washers and O-rings.
In addition, brazing is highly adaptable to automated methods. The brazing process is also flexible. Parts can be brazed manually with a hand torch or fixtured for semiautomated and fully automated assembly. According to Tony Straniero, district sales engineer at Fusion Inc. Willoughby, OH , brazing is ideal when service temperatures get high and leak-free joints are required. Many engineers automatically associate brazing with copper. It is also used for more and more ceramic joining applications.
Indeed, brazing is ideal for joining dissimilar materials. The thickness of such intermetallic compound can be controlled to some degree and deleterious effects may be mitigated. Filler metals for brazing applications are available in numerous forms, including powders, paste, wire, rods, strips, preforms and flux-coated forms. In addition, a variety of flux chemistries is available to minimize the oxidation that may form on both the filler metal and the parts being joined. It can also be used with brazing preforms.
Hauser says any metal and ceramic material, such as oxide, carbide, nitride or glass, that melts above F typically works the best with brazing. Lap joints that support shear are best for brazing, like adhesive bonding.
While butt joints are occasionally brazed, they are typically avoided. I can't imagine how one could fabricate an automobile radiator evaporator, condenser and other heat exchangers cost-effectively without brazing. While brazing is still not as widely used as soldering or welding, it is becoming more popular today, especially as manufacturers look for alternative joining methods to avoid fumes, heat and post cleaning.
With the improvements we've made in automation and the new alloys on the market, there is more brazing than ever, especially where aluminum is concerned. According to Dr. Dusan Sekulic, professor of mechanical engineering at the University of Kentucky Center for Manufacturing Lexington, KY , brazing is being used at an increasing rate. Brazing of titanium and other high-performance materials, as well as light metals, continues to have great importance for all branches of transportation, such as aerospace and automotive.
Engineers are looking for faster joining methods that produce assemblies with fewer failures and long service lives. Madison Heights, MI. When an engineer looks at manufacturing an assembly, he has many processes to consider. Brazing should be one of them. For instance, engineers at EWI have been experimenting with new processes, such as active metal brazing.
Cotton's organization has developed CuproBraze, a controlled atmosphere brazing process that eliminates subsequent rinsing and water treatment steps, avoiding strong fluxes that are required in aluminum brazing. According to Cotton, it is an economical process that is suitable to mass production. And, unlike welding, brazing does not melt the base metals, so the dimensions can be tightly controlled and dissimilar alloys can be joined.
Also, high temperatures are expensive, since heat is energy and energy costs money. The more heat you need to make the joint, the more the joint will cost to produce. Now, consider the automated welding process. What happens when you join not one assembly, but hundreds or thousands of assemblies? Welding, by its nature, presents problems in automation. A resistance-weld joint made at a single point is relatively easy to automate. However, once the point becomes a line — a linear joint — once again, the line must be traced.
It's possible to automate this tracing operation, moving the joint line, for example, past a heating station and feeding filler wire automatically from big spools. This is a complex and exacting setup, though, warranted only when you have large production runs of identical parts. Keep in mind that welding techniques do continually improve. You can weld on a production basis via electron beam, capacitor discharge, friction and other methods. These sophisticated processes usually call for specialized and expensive equipment plus complex, time consuming setups.
Consider if they are practical for shorter production runs, changes in assembly configuration or typical day-to-day metal joining requirements. If you need joints that are both permanent and strong, you will likely narrow down your metal joining consideration to welding versus brazing. Welding and brazing both use heat and filler metals. They can both be performed on a production basis. However, the resemblance ends there.
They work differently, so remember these brazing vs welding considerations:. Other options? Adhesive bonding and soldering will provide permanent bonds, but generally, neither can offer the strength of a brazed joint —equal to or greater than that of the base metals themselves. When you need permanent, robust metal-to-metal joints, brazing is a strong contender. We have placed cookies on your computer to give you the best possible experience with our website. These cookies are also used to ensure we show you advertising that is relevant to you.
If you continue without changing your settings, you are agreeing to our use of cookies to improve your user experience. You can click the cookie settings link on our website to change your cookie settings at any time.
Cookie Policy. When you visit a website, it may collect information about your browser, your preferences, or your device to make the website work as you expect it to.
This information is collected in the form of cookies. The information collected does not identify you directly, but it can give you a more personalized website experience. The following describes the different types of cookies we are using and gives you the option to not allow some types of cookies.
Click on the category headings to learn more and change your default cookie settings. Please note that blocking some types of cookies may impact your website experience.
These cookies are essential in order to enable you to move around the website and use its features. Without these cookies, website services, such as remembering your shopping cart items, cannot be provided. We are unable to turn these cookies off in the system. While you may be able to set your browser to block or alert you about these cookies, some parts of the website will not function without them. These cookies collect anonymous information on how people use the website: website visits, traffic sources, click patterns and similar metrics.
They help us understand what pages are the most popular. All of the information collected is aggregated and therefore anonymous. If you do not allow these cookies, we will not know when you have visited our website.
These cookies collection information about your browsing habits in order to make advertising more relevant to you and your interests. They are set up through our advertising partners, who compile your interests and target you with relevant ads on other websites or platforms. If you do not allow these cookies, you will not experience our targeted advertising on other places throughout the web. Preserves the visitor's session state across page requests.
Expiration: Session. Identifies the user and allows authentication to the server Expiration: Session. Google Analytics gathers website information allowing us to understand how you interact with our website and ultimately provide a better experience. Registers a unique ID that is used to generate statistical data on how the visitor uses the website.
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