2. Cold Metal Skills 6831.24

3. Skills Needed for Cold Metal Tasks

4. Identify Metal Identify metal so that its characteristics will be known before trying to do other cold metal and welding tasks

5. Cutting Cold Metal Done to make it the correct size: length and width

6. Thin Metal Cutting thin cold metal is done by using snipes, shears, or a cold chisel

8. Thick Metal Cutting thick cold metal is done with a hacksaw or a metal cutting saw blade in band saws, jigsaws, or reciprocating saws

13. Drilling The method used to make round holes in cold metal using drills and metal cutting bits

14. Bending Metal Bending cold metal not more than 3/8” thick can be done with a ball peen hammer and machinists vise

16. Bending Metal Metal thicker than 3/8” should be heated before bending

17. Shaping Cold Metal Shaping cold metal can be done by cutting, filing, grinding, or bending or combining any of these skills

18. Filing The main reason to file metal is to smooth rough places, but filing is also used to sharpen some tools

19. Grinding Grinding is the procedure used to sharpen points or edges of cutting tools made of high carbon steel

21. Demonstrating Cold Metal Skills

22. Ferrous Contain iron

23. Ferrous Metals Will rust and have to be painted or oiled to protect

24. Ferrous Metals Cast iron Wrought iron Steel

25. Non-ferrous Do not have iron

26. Nonferrous Metals Aluminum Copper Magnesium

27. Identify Metal Identify metal so that its characteristics will be known before trying to do other cold metal and welding tasks

28. Metal Identification Identified by color, weight, texture, use, shape, forge or cast marks, and spark test

29. Spark Test Color, shape, quantity, length, and position of sparks are used to identify metals

30. Cast Iron Has red lines in the sparks

33. High Carbon Steel Has yellow lines with several star bursts

35. Wrought Iron Has long straw-colored lines without burst

37. Galvanized Steel Should be identified because it gives off poisonous gas when heated for cutting or welding

40. Snips or Shears Will not cut metal that is too thick

42. Thick Metal Should be cut with a metal cutting saw such as hacksaw, band saw, or abrasive cut-off saw (chop saw)

43. Drilling Metal Done by securing metal in a machinist’s vise

44. Drilling Metal Using a center punch and ball peen hammer to dent the metal to prevent the drill bit from wandering from the desired location

46. Drilling Metal Using a drill and bit to drill the hole

47. Machinist’s vise Should be used to secure cold metal for cutting, drilling, filling, or bending

49. Round File The inside of a drilled hole should be smoothed with a round file

50. Flat File Can be used to smooth the cut edges of cold metal

52. Grinder Used to shape and sharpen the hollow- ground cutting edge of tools such as wood chisels

54. Alloy A mixture of two or more metals

55. Steel Is an alloy of iron and carbon

56. Mild Steel Known as the workhorse of steels

57. Mild Steel Used to make expanded metal

58. Stainless Steel Will not rust

59. Cold Metal Skills 6831.24