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

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

3. Applications

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

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 Societyhttp://www.aws.org/ http://www.ewi.org/ Welding and Joining Information Networkhttp://www.ewi.org/ 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 1993http://www.adtdl.army.mil/cgi-bin/atdl.dll/tc/9-237/toc.htm http://www.lincolnwelding.com Lincon Electric (welding supply co.)http://www.lincolnwelding.com http://www.weldingengineer.com/ Welding Procedures and Welding Techniqueshttp://www.weldingengineer.com/

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. cfmhttp://www.efunda.com/processes/metal_processing/welding_inertgas. cfm

17. Questions?