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Introduction to Shielded Metal Arc Welding

Introduction to Shielded Metal Arc Welding. Objectives. Identify S hielded Metal Arc Welding ? List the safety precautions for arc welding? List the equipment needed for shielded arc welding. List some basic welding joints and positions. Label the different parts of the arc

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Introduction to Shielded Metal Arc Welding

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  1. Introduction to Shielded Metal Arc Welding

  2. Objectives • Identify Shielded Metal Arc Welding? • List the safety precautions for arc welding? • List the equipment needed for shielded arc welding. • List some basic welding joints and positions. • Label the different parts of the arc welding equipment.

  3. Shielded Metal arc welding (SMAW) is a fusion process where heat is obtained from an electric arc which is formed between a base metal and an electrode.

  4. Safety precautions are: Don't strike arc until helmet is in place Wear proper clothing Hold electrode holder by insulated handle Proper ventilation is needed Avoid welding near combustible material Always wear safety glasses Never stand in water when welding Never weld on closed containers

  5. Some basic welded joints are Butt, Tee, Lap, Corner Two types of Butt Joints: Square and Beveled Square: used to weld light pieces of metal (1/16 to 3/16 inch)

  6. Beveled: used to weld heavier pieces of metal 3/8 to 1/2 inch metal can be welded by using a single V or U joint 1/2 inch metal and above can be welded by using a double V or U joint

  7. Tee Joint: used to weld two pieces of metal that are approximately 90 degrees to each other.

  8. Lap Joint: used to join two overlapping pieces of metal 1. Single lap joint welded on one side 2. Single lap joint welded on two sides (develops full strength) 3. Offset lap joint is used to weld two pieces of metal that need to be joined in the same plain

  9. Corner Joint: used to join metal that are right angles to each other.1. Closed corner joint- used on lighter sheets of metal where strength is not required at the joints.2. Half open corner joint- used on heavier metal when only one side can be welded.3. Open Corner joint- used on heavy metal. It is the strongest of corner joints 2. 3. 1.

  10. Types of welds: fillet and groove A. Fillet- used when joining two pieces of metal together without preparing the surface of the metal first. B. Groove- used when preparing the metal before welding it into place. Fillet Welds

  11. Groove Welds

  12. Some equipment: • (A) Grinder (E) Chipping Hammer • (B) Helmet (F) long sleeves • (C) Vice (G) Pliers • (D) Wire brush (H) Closed toed shoes

  13. Welding positions: Flat, Horizontal, Vertical, Overhead • The amperage setting is determined by the rod size and thickness of the work

  14. Parts of the Arc Welder • AC/DC switch (polarity switch) • Amperage adjustment dial • Positive cable lug • Electrode holder • Electrode • Amperage scale • Ground clamp • Ground cable lug • Power cord • Air vents • Power switch

  15. Review • What equipment is needed? • List the basic welding joints • List the different welding positions • Identify the parts of an arc welder

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