Unit 7.7Welding

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1. What is essential to know to achieve optimum performance of your plasma cutting system?

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2. What is Plasma? It’s the fourth state of matter that forms because of heat added to gas

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3. What is the perfect cut? It Would Have a Square angle, no Metallurgical Changes, and no kerf

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4. List 4 types of cutting methods. Chemical, Thermal, Mechanical, and Thermal-chemical

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5. What is the 4th state of matter? Plasma

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6. What are the first three states of matter? Solid, liquid, and Gas

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7. Define ice. Ice is the solid state of water

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8. Define steam. Steam is the gas form of water

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9. Explain ionization of gases.

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10. What is a natural example of plasma . Lightning

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11. Define Plasma Cutting.

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12. What does the torch do? The torch is a holder for consumable parts and provides cooling to these parts

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13. What does the nozzle and electrode do?

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14. What are the four major system components of every plasma cutting system? Start Signal, Torch Starting Mechanisms, Gas Flow, Pilot Arc

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15. Define power supply. Produces constants pure DC Output

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16. Explain what the gas console does?

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17. Explain the functions of the torch. Holds the consumable parts and cools them it is the most important piece of the puzzle

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18. List the sequence of events that takes place with plasma cutting.

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19. What does OCV stand for? Open current Voltage

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20. What does HF stand for? High frequency

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21. When the pilot arc is brought into contact with the ___Work Piece_______, it will attach to the workpiece. The ___Plasma_______ arc melts the metal, and the high velocity gas removes the molten material.

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22. What causes nozzle damage? Pitting and Ovaling the ofrice

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23. What is torch shielding?

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24. List 4 benefits of torch shielding?

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25. Define Kerf: an opening caused by metal removed by plasma arc

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26. Define dross. Dross is the resolidfied on the bottom or top of the cut

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28. What are lag lines? Lag lines are ripples on the cut face or surface

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28. What are three applications of using plasma cutting?