1. Welding Transportation Mr. O’Rourke

2. What is Welding? A fabrication process that joins metal. This is done by melting the work pieces and adding a filler material to form a pool of molten material that cools to become a strong joint. A fabrication process that joins metal. This is done by melting the work pieces and adding a filler material to form a pool of molten material that cools to become a strong joint.

3. How Does it Work? Welding uses an energy source (gas flame, electric arc, or laser) to heat and melt metals together. This meting causes impurities in the metal which are shielded by various gases to provide a clean weld. Welding uses an energy source (gas flame, electric arc, or laser) to heat and melt metals together. This meting causes impurities in the metal which are shielded by various gases to provide a clean weld.

4. Types of Welding Gas Metal Arc Welding (metal inert gas or MIG)- is a semi-automatic process that uses a continuous wire feed as an electrode and an inert or semi-inert gas mixture to protect the weld from contamination. Gas Metal Arc Welding (metal inert gas or MIG)- is a semi-automatic process that uses a continuous wire feed as an electrode and an inert or semi-inert gas mixture to protect the weld from contamination.

5. MIG Welder Components Power Switch Power Switch Voltage Adjustment Voltage Adjustment Wire Speed Adjustment Wire Speed Adjustment Torch Torch Ground Ground Wire Spool Wire Spool Gas tank Gas tank

6. How Do We MIG Weld? Clean weld surface Clean weld surface Ground out work piece Ground out work piece Set voltage and wire speed Set voltage and wire speed Squeeze trigger keeping torch tip 1/4-1/2” from work piece Squeeze trigger keeping torch tip 1/4-1/2” from work piece Move torch tip in small circular, U shaped, or zig-zag motion Move torch tip in small circular, U shaped, or zig-zag motion

7. MIG Weld Problems Things to consider: Torch distance, travel speed, voltage setting, wire speed setting, torch motion Things to consider: Torch distance, travel speed, voltage setting, wire speed setting, torch motion

8. Safety Safety Glasses Safety Glasses Welding Mask Welding Mask Gloves Gloves Long sleeves, pants Long sleeves, pants No open toe shoes No open toe shoes Ventilation Ventilation Bright Light!!!- High Heat!!! Bright Light!!!- High Heat!!! Yell Cover Before Beginning Your Weld! Yell Cover Before Beginning Your Weld!

9. Benefits of MIG Welding Can be use on carbon steel, stainless steel, aluminum, copper, nickel, bronze and more Can be use on carbon steel, stainless steel, aluminum, copper, nickel, bronze and more All position capabilities All position capabilities Fairly easy to learn Fairly easy to learn

10. Disadvantages of MIG Only for thin to medium thicknesses Only for thin to medium thicknesses Less portable than other forms due need for gas tank Less portable than other forms due need for gas tank Sloppier than other forms Sloppier than other forms

11. Other Forms of Welding Gas tungsten arc welding Gas tungsten arc welding (tungsten Inert Gas, TIG) (tungsten Inert Gas, TIG) Shielded metal arc welding Shielded metal arc welding (stick, arc) (stick, arc) Oxygen-acetylene Oxygen-acetylene