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Welding

Welding Presented by Robert Pelton & Tyson Baker MeEn 372 December 10, 2001 Applications Equipment/Processes Specifications Joint types Weld Joints Stress Concentrations Stress Calculations Outline Applications MIG (Metal Inert Gas) TIG (Tungsten Inert Gas)

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Welding

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  1. Welding Presented by Robert Pelton & Tyson Baker MeEn 372 December 10, 2001

  2. Applications Equipment/Processes Specifications Joint types Weld Joints Stress Concentrations Stress Calculations Outline

  3. Applications

  4. MIG (Metal Inert Gas) TIG (Tungsten Inert Gas) SAW (Submerged Arc Welding) SMAW (Shielded Metal Arc Welding) Types

  5. Equipment

  6. Fundamentals • Electrode • Filler material • Solid • Cored • Shielding gas • Argon • Nitrogen • Helium

  7. Specifications • MIG • Capacity: 0.020 to 0.250 in • consumable electrode • Weld materials: Carbon steels, low alloy steels, stainless steels, most aluminum alloys, zinc based copper alloys • TIG • Capacity: 0.005 to 0.250 in • Non-consumable tungsten electrode

  8. Considerations • Accessibility • Distortion • Heat • Spatter • Surface finish • Automation

  9. Problems

  10. Causes • Cracks • Cavities (Porosity) • Rough Dirty Bead • Incomplete fusion Good Weld Surface Porosity

  11. Joint Types

  12. Stress Concentration

  13. Stress Calculations

  14. Weld strength

  15. Web Sites • http://www.aws.org/ American Welding Society • http://www.ewi.org/ Welding and Joining Information Network • http://www.adtdl.army.mil/cgi-bin/atdl.dll/tc/9-237/toc.htm Welding Theory and Application, Department of the Army, Washington, DC, 7 May 1993 • http://www.lincolnwelding.com Lincon Electric (welding supply co.) • http://www.weldingengineer.com/ Welding Procedures and Welding Techniques

  16. References • Todd, Robert H., et al., Manufacturing Processes Reference Guide, Industrial Press Inc. New York, 1994. • http://www.efunda.com/processes/metal_processing/welding_inertgas.cfm

  17. Questions?

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