Presentation on theme: "CHAPTER 30 Brazing, Soldering, Adhesive-Bonding, and Mechanical-Fastening Processes."— Presentation transcript:
1 CHAPTER 30Brazing, Soldering, Adhesive-Bonding, and Mechanical-Fastening Processes
2 BrazingFigure (a) Brazing and (b) braze welding operations.
3 Typical Filler Metals for Brazing Various Metals and Alloys
4 Furnace BrazingFigure An example of furnace brazing: (a) before, (b) after. Note that the filler metal is a shaped wire.
5 Induction BrazingFigure Schematic illustration of a continuous induction-brazing setup, for increased productivity. Source: ASM International.
6 Joint 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.
7 Brazing 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.
11 Joint 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.
12 Typical Properties and Characteristics of Chemically Reactive Structural Adhesives
19 Design 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.
20 Metal Stitching and a Double-Lock Seam Figure Various examples of metal stitching.Figure Stages in forming a double-lock seam.
21 CrimpingFigure Two examples of mechanical joining by crimping.
22 Spring and Snap-In Fasteners Figure Examples of spring and snap-in fasteners used to facilitate assembly.