Presentation on theme: "CHAPTER 30 Brazing, Soldering, Adhesive-Bonding, and Mechanical-Fastening Processes."— Presentation transcript:
1CHAPTER 30Brazing, Soldering, Adhesive-Bonding, and Mechanical-Fastening Processes
2BrazingFigure (a) Brazing and (b) braze welding operations.
3Typical Filler Metals for Brazing Various Metals and Alloys
4Furnace BrazingFigure An example of furnace brazing: (a) before, (b) after. Note that the filler metal is a shaped wire.
5Induction BrazingFigure Schematic illustration of a continuous induction-brazing setup, for increased productivity. Source: ASM International.
6Joint Designs Used in Brazing Figure Joint designs commonly used in brazing operations. The clearance between the two parts being brazed is an important factor in joint strength. If the clearance is too small, the molten braze metal will not fully penetrate the interface. If it is too large, there will be insufficient capillary action for the molten metal to fill the interface.
7Brazing DesignFigure Examples of good and poor design for brazing.
8(a)Figure (a) Screening or stenciling paste onto a printed circuit board: 1. Schematic illustration of the stenciling process; 2. A section of a typical stencil pattern. (continued)Stenciling
9(b)Wave Soldering(c)Figure 30.6 (continued) (b) Schematic illustration of the wave soldering process. (c) SEM image of wave-soldered joint on surface-mount device.
11Joint Designs Used in Soldering Figure Joint designs commonly used for soldering. Note that examples (e), (g), (i), and (j) are mechanically joined prior to being soldered, for improved strength. Source: American Welding Society.
12Typical Properties and Characteristics of Chemically Reactive Structural Adhesives
19Design Guidelines for Riveting Figure Design guidelines for riveting. (a) Exposed shank is too long; the result is buckling instead of upsetting. (b) Rivets should be placed sufficiently far from edges to avoid stress concentrations. (c) Joined sections should allow ample clearance for the riveting tools. (d) Section curvature should not interfere with the riveting process. Source: J. G. Bralla.
20Metal Stitching and a Double-Lock Seam Figure Various examples of metal stitching.Figure Stages in forming a double-lock seam.
21CrimpingFigure Two examples of mechanical joining by crimping.
22Spring and Snap-In Fasteners Figure Examples of spring and snap-in fasteners used to facilitate assembly.