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Comprehensive Guide to Welding Processes: Techniques and Applications

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  1. Welding Processes Chapter 18

  2. Welding • The process of joining two or more pieces of like metal • Parts are heated enough to cause it to melt where they meet • When the metal cools it solidifies, joining the parts • Properly welded joints are as strong as or stronger than the original material • Considered a permanent fastening method

  3. Welding Processes • All processes shown on page 673, fig 21.3 • Most common types: • Oxygen Gas Welding • Oxyacytlene welding (2 tanks) fig 21.4 • Can be used with: natural gas, propane, propylene • Typically used to fabricate thin materials • Used mostly for repair work (portable) • Can also be used to cut • Low operating cost • Slower than other processes

  4. Also associated with brazing • Brazing is considered bonding • Base materials remain solid while the filler material melts then cools to bond the pieces together • Shielded Metal Arc Welding (stick welding) • Most traditionally used process • Used on a variety of metals • Used a flux covered metal electrode to carry electric current that forms an arc to melt the metal • Electrode also melts and joins the melting base materials to form the weld

  5. Gas Tungsten Arc Welding • Tungsten inert gas welding (TIG) • Can be used on a wider variety of metals • Produces clean high quality welds • Usually limited to thin parts that need high quality joint • Slow process • High cost for equipment and materials • Gas Metal Arc Welding (MIG) • Very fast and economical • Used on thin or thick materials • Used in mass production

  6. Basic Welding Joints

  7. Welding Drawings • Typically called weldments or welding assemblies • Shows parts together in multi-view • Contains : Fabrication dimensions Types of joints Weld symbols • Parts are shown as separate pieces on the drawing (don’t unite solids) • All parts may not be dimensioned completely • May have separate detail drawings

  8. Weld Symbol • Directions for welded joints • Gives information for type of weld, size, process to be used, finishing processes, etc

  9. Side Significance • Weld symbols can be on either side of the reference line, each side is meant for a specific side of the joint

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