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Basic Electricity and Welding

Basic Electricity and Welding. The Arc Welding Circuit. The electricity flows from the power source, through the electrode and across the arc, through the base material to the work lead and back to the power source. Basic Electricity. DC -.

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Basic Electricity and Welding

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  1. Basic Electricity and Welding

  2. The Arc Welding Circuit • The electricity flows from the power source, through the electrode and across the arc, through the base material to the work lead and back to the power source

  3. Basic Electricity DC - • Voltage – The electrical potential or pressure that causes current to flow • Measured in Volts • Current – The movement of charged particles in a specific direction • Measured in Amps • Polarity • DC- (Direct Current Electrode Negative) • DC+ (Direct Current Electrode Positive) • AC (Alternating Current) DC+ AC

  4. Arc WeldingBasics

  5. Unit Topics • Topics included in this overview are: • Introduction • What is Arc Welding? • Why is Welding Important? • Why Learn to Weld? • Careers in Welding • The American Welding Society (AWS) • Welding Safety • Basic Electricity • Welding Fundamentals • Welding Certification

  6. Objectives • Upon successful completion of this unit of study, you will be able to … • Identify definitions and terminology associated with welding • Demonstrate safe working habits in the welding environment • Name the parts and types of welds and weld joints • Interpret basic welding symbol information • Identify opportunities available to welders

  7. Introduction

  8. What is Arc Welding? • Arc welding is most commonly used to join two pieces of metal • The welder creates an electric arc that melts the base metals and filler metal (consumable) together so that they all fuse into one solid piece of metal Final weld after several beads are made Steel Pipe – Tack Welded Root Pass or “Stringer Bead”

  9. Why is Welding Important? • Many things around us are welded … • Pipelines that bring fresh water • Towers that carry electricity to houses • Cars and buses that take people where they need to go

  10. Why Learn to Weld? • Welding is so HOT …. it’s COOL! • Welding can help build a successful career so you can get the things you want in life • Skilled welders are in demand – people use things that are welded everyday! • Welding can be fun and safe • It is challenging and high-tech

  11. Basic Steps of Arc Welding • Prepare the base materials: remove paint and rust • Choose the right welding process • Choose the right filler material • Assess and comply with safety requirements • Use proper welding techniques and be sure to protect the molten puddle from contaminants in the air • Inspect the weld

  12. English, Math, and Science Connection

  13. Current Tension Compression Tensile strength Yield Blueprints Depth/width ratio Preheat temperature Cubic feet per hour English, Math, and Science Connection • Many of the same concepts you learn in other classes are practiced in welding. In what other classes might you study the following terms? • 75/25 – gas mixture • Volts • Amps • Degree/hr – cooling rate • In/min • Angles/degrees • Metallurgy • Fillet size

  14. Math Terms and Welding

  15. Math Terms in Welding • Believe it or not, a lot of math is used in welding

  16. Welding Symbols

  17. Welding symbols give the welder specific instructions about the weld including: Placement Size Length Process Any other special notes Welding symbols are Universally used Governed by the AWS Found on engineering drawings What are Welding Symbols? “How to Read Shop Drawings” available at www.jflf.org

  18. Welding symbols contain information about the weld to be made S – leg dimension of the weld Triangle – the weld is to be made on the arrow side of this joint Tail – any additional information required (i.e. position the weld is to be made) Arrow - the joint the welding symbol applies to Welding Symbols

  19. Parts of a Weld

  20. Parts of a Weld Heat Affected Zone Joint and Weld

  21. Groove and fillet welds can be made on many types of joints Fillet and Groove Welds

  22. Fillet Weld Inspection • Fillet welds should: • Have a flat to slightly convex face • Be uniform in appearance • Have equal leg size • Have good wash-in into base materials • This is an example of a good fillet weld:

  23. Welding Positions

  24. What are Welding Positions? • There are various positions that a weld can be made in:

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