The following Brazing Q & A articles were published in the Welding Journal and are available online.
- April 2012 by Dan Kay
Q: We are brazing high-temperature alloys together with nickel-based brazing filler metals (AMS 4777), and have had problems with parts failing in service due to cracks right through the brazed joints. The vacuum furnaces we use for brazing appear to be fine, and cross-section evaluation of the failed parts showed that joint clearances were about 0.006 in. (0.15 mm) in the joints before they cracked. Why are these joints failing in service if we're doing our best to keep the parts really clean before and during brazing, and our vacuum brazing cycle appears to be correct according to our customer specification requirements?
A: You are experiencing a problem that many brazing shops face, namely that of correctly dealing with joint-clearance issues during nickel-brazing processes. Read More
- February 2012 by Alexander E. Shapiro
Q: We want to braze a 1/16-in.-diameter tungsten rod into a quartz glass tube about 11/2 in. in diameter. The rod will work as an electrode inside the glass tube. A similar device that we have used for many years looks like it was made using a glass solder. How do we select the correct glass solder? What is the soldering technique that is applicable for use in a university lab? In other words, how can we make a sealed joint between the quartz glass tube and the tungsten rod?
A: Brazing or soldering glass to metals has a long history of applications. Since ancient times, they were used for decoration of glassware, in jewelry, and later, in the manufacture of optical and chemical devices. Read More
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Welding Journal
The award-winning Welding Journal offers feature articles, late-breaking news, stainless steel, brazing, automation, Washing and website columns, new product and literature spotlights, company and personnel maneuvers and advancement, and peer-reviewed R & D reports. Welding Journal is read by more people around the world than any other welding and related joining processes publication and has won more than 50 awards for editorial and design excellence. More Information
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