Chapter 32: Resistance and Solid-State Welding Processes DeGarmo’s Materials and Processes in...
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Transcript of Chapter 32: Resistance and Solid-State Welding Processes DeGarmo’s Materials and Processes in...
![Page 1: Chapter 32: Resistance and Solid-State Welding Processes DeGarmo’s Materials and Processes in Manufacturing.](https://reader033.fdocuments.in/reader033/viewer/2022061607/56649ee55503460f94bf4c54/html5/thumbnails/1.jpg)
Chapter 32:Resistance and Solid-State Welding Processes
DeGarmo’s Materials and Processes in Manufacturing
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32.2 Theory of Resistance Welding
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Basic Resistive Welding
FIGURE 32-1 The basic resistance welding circuit.
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Resistive Welding Temperature Distribution
FIGURE 32-2 The desiredtemperature distribution acrossthe electrodes and workpiecesduring resistance welding.
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Current and Pressure for Resistive Welding
FIGURE 32-3 A typical current and pressure cycle for resistance welding. This cycle includes forging and postheating operations.
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Schematic of Resistive Welding
FIGURE 32-4 Thearrangement of the electrodesand workpieces in resistancespot welding.
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32.3 Resistance Welding Processes
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Microstructure of a Resistance Weld
FIGURE 32-5 A spot-weld nugget between two sheets of 1.3-mm (0.05-in.) aluminum alloy. The nugget is not symmetrical because the radius of the upper electrode is greater than that of the lower electrode. (Courtesy Lockheed Martin Corporation, Bethesda, MD.)
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Tear Test
FIGURE 32-6 Tear test of a satisfactory spotweld, showing how failure occurs outside ofthe weld.
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Resistive Welder
FIGURE 32-7 Three-phase, air-operated, press-type resistance welder with microprocessor control. (Courtesy Sciaky Inc., Chicago, IL.)
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Spot Welding Seams
FIGURE 32-8 Seam weldsmade with overlapping spotsof varied spacing. (CourtesyTaylor-Winfield Corporation,Brookfield, OH.)
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Schematic of Seam Welding
FIGURE 32-9 Schematicrepresentation of theseam-welding process.those
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Tube Welding
FIGURE 32-10 Using high- Squeeze rollfrequency AC current to producea resistance seam weld in buttweldedtubing. Arrows from thecontacts indicate the path of thehigh-frequency current
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Projection Welding
FIGURE 32-11 Principle ofprojection welding (a) prior toapplication of current andpressure and (b) after formationof the welds.
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Process Summary for RW