Welding 11th grade final pt2

49 flashcards · Other · by Maria Pokrovskiy

1. The PPE that should be worn when operating the portable disc grinder is

   long sleeves, gloves, face shield, safety glasses.

2. The portable disc grinder when laid down should be positioned on

   the tool rest with the grinding disc facing up.

3. It is only necessary to tighten the disc lock nut snuggly when the disc is replaced on the portable disc because

   the natural rotation of the disc and spindle will cause the threads to tighten.

4. A good grinding wheel will have a _____ sound when it is sounded.

   ringing

5. When using the bench grinder, grinding should be done only on the upper ___ of the grinding wheel.

   1/2

6. A grinder tool rest should never be more than ____ from the grinding wheel.

   1/8 inch

7. Grinding WHEEL RPM’s need to ______ grinder MOTOR RPM’s

   exceed

8. A grinding wheel should be replaced when worn to ____ of its original diameter.

   1/2

9. Grinding wheels which produce the smoothest grinding surface have a _______ #, example 120.

   high grit

10. A Jacobs chuck should be used with a

    straight shank twist drill.

11. To select the proper twist drill, one should check

    size, sharpness and type of shank.

12. Maintaining enough __________ to keep the bit cutting at all times should be done while drilling metal with a drill press.

    feed pressure

13. Metal chips should be removed from the drill press by using a

    brush

14. To prevent seizing one should ________ feed pressure when the hole is about finished.

    reduce

15. ____ lubricant (s) should be used when connecting the parts of an oxy fuel gas welder.

    No

16. DCEN stands for

    Direct Current Electrode Negative.

17. AC stands for

    Alternating current

18. Right Hand threads are on the

    Oxygen connections

19. Left Hand threads are on the

    acetylene connections.

20. The minimum shade of tint for oxy-acetylene cutting/welding is

    4/5

21. ___ is the maximum line regulator pressure for acetylene.

    15 psi

22. When opening cylinder valves, you should stand ______ incase the regulator explodes.

    off to the side

23. ______ is the space left in the metal as the metal is removed during a cut.

    Kerf

24. A _____ is present in any electrical discharge.

    plasma

25. Plasma arc cutting has ________ than oxy/fuel cutting.

    less distortion

26. metals that can be cut with the plasma arc cutter

    aluminum, stainless and carbon steel and more

27. The __________ is critical to producing quality plasma cuts.

    nozzle standoff distance

28. the minimum shade lens required for plasma arc cutting.

    4-5

29. The fume plume for plasma arc cutting is

    Large and needs to be well ventilated.

30. Carbon steel does ____ give off a toxic fume.

    NOT

31. Hydrogen gas is generated when

    Aluminum is cut with the plasma arc cutter in the presence of water or moisture.

32. A toxic phosgene gas may be generated if plasma arc cutting takes place in the presence of

    vapors from chlorinated solvents and cleaners.

33. Electrical shock is more of a possibility in the _____ arc cutting process than with arc welding process because of the high voltage and amperage used.

    plasma

34. 70 psi

    the approximate air pressure that must be present to activate most plasma arc cutters.

35. The travel speed of the plasma arc cutting machine must be slowed down when the metal being cut is _____

    thick

36. Use a _________ with the plasma arc cutter to be assured of getting good straight cuts.

    straight edge

37. If the quality of the cut deteriorates with the plasma arc cutter .........

    the constricting nozzle needs replacing and/or the electrode needs replacing.

38. DCEP stands for:

    Direct Current Electrode Positive.

39. Three safety precautions that should be applied to all forms of arc welding;

    Do not weld in wet areas Never change polarity while welding machine is running Never look at the arc, shield others

40. Undercut is a trench at either toe of the weld caused by

    too much heat and/or wrong rod angle.

41. DCSP stands for:

    Direct Current Straight Polarity.

42. DCRP stands for:

    Direct Current Reverse Polarity.

43. A __________ should be used for lighting a torch.

    friction lighter

44. A fractured grinding wheel will have a ________ when it is sounded.

    Dull sound

45. If excessive pressure is applied to a grinding wheel it is likely to cause

    a chipped grinding wheel.

46. The purpose of standing to the side when the grinder is turned on is to keep from

    getting hit by flying debris

47. When operating the portable disc grinder the grinding disc should be positioned so the sparks and grit are thrown

    away from the operator and others in the work area.

48. #14

    the minimum size electrical extension cord used with most portable disc grinders.

49. The spark deflector on a grinder should be adjusted to within ____ inches of the grinding wheel.

    1/16