By American Welding Society. Committee on Brazing and Soldering
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The purity of a protective atmosphere, as measured by the ability to dissociate the oxides of a specific base metal in the brazement, also influences the clearance requirement. 002 in. 05 mm) clearance joint and onto the surface of the base metal. In this case, a lower quality atmosphere (higher partial pressure of oxygen) or a lower clearance can be used. 002 in. 05 mm] is heated to 2050°F [1121°C] in a hydrogen atmosphere with a dew point of –60°F [–51°C] or lower, the copper filler metal is pulled out of the joint onto the surface of the carbon steel).
However, that would take too long, and they had to keep a fleet of aircraft flying. They sought help and were advised to remove the very stiff, thick, protruding end of the fitting. 14(C). , the tube cracked) at around 7,000 cycles. The brazed assemblies with the machined radius did not fail until completing over 70,000 cycles. 8—Lap Joint Designs to be Used at High and Low Stress; Flexure of the Right Member in (C) and (D) Distributes the Load through the Base Metal, Thus Removing the Stress Concentration and Improving the Fatigue Life of the Brazement This actual field experience demonstrates the benefit of designing the brazed joint for its service requirements.
2004. When brazing beats welding. Fastening and Joining. (12): 86–90. Sapp, Mark. 2005. A history of thermal joining web site. January 27, 2005. weldinghistory. org>. Simonson, R. D. 1969. The history of welding. Morton Grove, Illinois: Monticello Books. 21 AWS BRAZING HANDBOOK CHAPTER 2 BRAZEMENT DESIGN Reviewers R. L. Peaslee Wall Colmonoy Corporation R. L. Holdren Edison Welding Institute T 1T (A) LOW APPLIED STRESS HIGH STRESS CONCENTRATION (B) 3T LOWERED STRESS CONCENTRATION IN THE BRAZED JOINT (C) 4T 4T HIGH STRESS HIGH APPLIED STRESS T (D) Photograph courtesy of Wall Colmonoy Corporation Contents Introduction Design Variables Base Metal Joint Design Fluxes and Protective Atmospheres Stress Distribution Service Requirements Brazing Filler Metal Brazing Process Variables Prebraze and Postbraze Cleaning Postbraze Heat Treatment Testing of Brazed Joints to Attain Design Data Inspection Drafting Conventions Bibliography Suggested Reading List 22 22 23 23 32 33 38 48 52 53 53 54 61 61 66 66 22 CHAPTER 2—BRAZEMENT DESIGN AWS BRAZING HANDBOOK CHAPTER 2 BRAZEMENT DESIGN INTRODUCTION Many variables are considered in the design and manufacture of reliable mechanical assemblies.