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To do list. Hilhiagriculture.weebly.com. The History of Welding and its Processes. Students will be able to know and understand the history of welding and what welding is. This will be accomplished by researching 3 welding processes. History of Metalworking.

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To do list

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  1. To do list • Hilhiagriculture.weebly.com

  2. The History of Welding and its Processes Students will be able to know and understand the history of welding and what welding is. This will be accomplished by researching 3 welding processes.

  3. History of Metalworking • Welding began more than 3000 years ago • Hot and cold metals hammered by forge weld • Bronze developed between 3000 and 2000 B.C. • Iron became known to Europe about 1000 B.C. • Several thousand years after copper • Replaced bronze as metal

  4. Early Developments in Welding • Edmund Davy discovered acetylene at the beginning of nineteenth century • Sir Humphrey Davy discovered the electric arc in 1801

  5. Later Developments • First commercial oxyacetylene welding torch at turn of the century • Electric arc welding method used in US until about 1920 • Technology of welding progressed slowly until World War I • Research on coated electrodes through 1920s resulted in electrode coatings and improved core wire

  6. What is Welding? • Welding is joining two pieces of metal by: • Heating to temperature high enough to cause softening or melting • With or without application of pressure and filler metal

  7. Review • Write this on the left side of your notes: • Who found the electric arc? • What is welding?

  8. Different Types of Welding

  9. Different Welding Processes • Forge Welding • Shielded Metal Arc Welding (SMAW) Arc • Gas Metal Arc Welding (GMAW) Oxyfuel • Flux-Cored Arc Welding (FCAW) MIG • Gas Tungsten Arc Welding (GTAW) TIG • Plasma Arc Welding • Submerged Arc Welding (underwater) • Resistance Welding • Spot Welding and Seam Welding • Ultrasonic Welding • Explosion Welding

  10. Stick and X-Ray Welding • Stick welding process • Advanced rapidly due to electrode coatings and improved core wire • Now called shielded metal arc welding (SMAW) • X-ray development • Possible to examine internal soundness of welded joints

  11. Tungsten Inert Gas (TIG) Process • An aluminum weld made using the TIG process. • The welding of aluminum is no longer a problem and can be done with the same ease as that of steel.

  12. GMAW (gas) Process • Concentrates high heat at a focal point • Produces • Small heat-affected zone • Narrow bead width • Deep penetration • Faster weldingspeed • Now used in all industries • Responsible for over 70 percent of welds being performed today.

  13. Resistance Welding • Includes spot welding, seam welding, and other similar processes performed on machines • Operators usually taught on job • Semiskilled workers do not need specific hands-on-welding skills https://www.youtube.com/watch?v=cOAdEIQKZDs

  14. Questions???

  15. Assignment • You will research 3 different welding processes of your choice (left side of your INB) • You need to find out the following information for each welding process….. • What is the name of your process? • When it was invented or started? • Where is this process most common? • How is your process used/done? • What type of jobs can you receive knowing this weld process?

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