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Introduction to joining process, welding classification,terminology,positions
The document discusses various metal joining processes with a focus on welding. It defines welding as the process of joining two metal pieces in a permanent manner using heat, with or without pressure. Various types of welding processes are classified based on whether filler material is used, the type of filler material if used, and whether fusion, plastic deformation, or solid-state joining occurs. Key terms related to welding such as filler metals, fluxes, and welding positions are also defined. The document provides an overview of metal joining processes and fundamentals of welding.
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Introduction to joining process, welding classification,terminology,positions
- 1. MANUFACTURING TECHNOLOGY – I CRAFTEDBY: RAMESH KUMAR A ASSISTANT PROFESSOR SONA COLLEGE OF TECHNOLOGY SALEM 07-02-2019 05:25 1
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- 3. METAL JOINING PROCESSES Sometimes impossible to manufacture single unit Different methods are used to join metals/alloys to complete the single unit The processing techniques used to fabricate a given shape are called joining processes 07-02-2019 05:25 3
- 4. METAL JOINING PROCESSES Mechanical joining Welding Soldering and brazing Adhesive joining Riveting Screwed fastening Electrical and electronic joining Soft soldering Hard soldering and brazing Crimping 07-02-2019 05:25 4
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- 6. WELDING Welding isthe process of joining two metallic pieces together in permanent manner Heat or pressure and sometimes both are used to achieve the required joint The coalescence is obtained when atoms of the two pieces to be joined come very close to each other Advantage: portable, permanent, stronger than the parent materials with a filler metal Disadvantage: Expensive manual labor, high energy and dangerous, does not allow disassemble and defects 07-02-2019 05:25 6
- 7. CLASSIFICATION OF WELDINGPROCESSES Based on the composition of the joints: Autogeneous joining No filler material used Solid phase welding and resistance welding Homogeneous joining Filler material same as of parent material Ex. Arc, gas and thermit welding Hetrogeneous joining Filler material different of parent material Ex. Soldering and Brazing 07-02-2019 05:25 7
- 8. CLASSIFICATION OF WELDINGPROCESSES Based on the application of pressure: Fusion welding Required joint is obtained by heating the two metal pieces to liquid state locally at the place of the joint Plastic or Pressure welding The two metal pieces are heated to some temperature below their melting temperature and the required joint is obtained by applying sufficient pressure between the two pieces Solid-state welding 07-02-2019 05:25 8
- 9. TYPES OF WELDINGPROCESSES 07-02-2019 05:25 9
- 10. TYPES OF WELDINGPROCESSES 07-02-2019 05:25 10
- 11. WELDABILITY Weldability ofa material is defined as its ability to be welded Depends on various factors such as metallurgical changes that occur during the process of welding, its hardness, and gas evolution and absorption, extent of oxidation and others Low carbon steel (c<0.12%) have the best weldability amongst metals As the carbon content increases, weldability decreases 07-02-2019 05:25 11
- 12. WELDING TERMINOLOGY FillerMetals: The material that you add to fill the space between two joining metals, during the welding process Welding rod Does not conduct electric current Welding electrode Conduct electric current Consumable (shielded metal arc welding) Non-consumable (gas tungsten arc welding)07-02-2019 05:25 12
- 13. WELDING TERMINOLOGY Fluxes Fluxrefers to a material used to dissolve oxides and release trapped gases and slag (impurities) from the base metal Paste, powder or liquid It is fluid and active at the melting point of the filler metal 07-02-2019 05:25 13
- 14. WELDING POSITIONS 07-02-2019 05:2514 Four basic welding positions defined by the American Welding Society