TAILIEUCHUNG - Text Book of Machine Design P10

Welded Joints | c H A P T E R 10 Welded Joints 1. Introduction. 2. Advantages and Disadvantages of Welded Joints over Riveted Joints. 3. Welding Processes. 4. Fusion Welding. 5. Thermit Welding. 6. Gas Welding. 7. Electric Arc Welding. 8. Forge Welding. 9. Types of Welded Joints. 10. Lap Joint. 11. Butt Joint. 12. Basic Weld Symbols. 13. Supplementary Weld Symbols. 14. Elements of a Weld Symbol. 15. Standard Location of Elements of a Welding Symbol. 16. Strength of Transverse Fillet Welded Joints. 17. Strength of Parallel Fillet Welded Joints. 18. Special Cases of Fillet Welded Joints. 19. Strength of Butt Joints. 20. Stresses for Welded Joints. 21. Stress Concentration Factor for Welded Joints. 22. Axially Loaded Unsymmetrical Welded Sections. 23. Eccentrically Loaded Welded Joints. 24. Polar Moment of Inertia and Section Modulus of Welds. Introduction A welded joint is a permanent joint which is obtained by the fusion of the edges of the two parts to be joined together with or without the application of pressure and a filler material. The heat required for the fusion of the material may be obtained by burning of gas in case of gas welding or by an electric arc in case of electric arc welding . The latter method is extensively used because of greater speed of welding. Welding is extensively used in fabrication as an alternative method for casting or forging and as a replacement for bolted and riveted joints. It is also used as a repair medium . to reunite metal at a crack to build up a small part that has broken off such as gear tooth or to repair a worn surface such as a bearing surface. CONTENTS 341 342 A Textbook of Machine Design Advantages and Disadvantages of Welded Joints over Riveted Joints Following are the advantages and disadvantages of welded joints over riveted joints. Advantages 1. The welded structures are usually lighter than riveted structures. This is due to the reason that in welding gussets or other connecting components are not used. 2. The .

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