Manufacturing Practice 2

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Manufacturing Practice 2

  1. 1. Manufacturing Practice 2 J 4121
  2. 2. SECTION 1 − SAFETY PRECAUTIONS1-1. Symbol Usage
  3. 3. 1-2. Arc Welding Hazards ELECTRIC SHOCK can kill. FUMES AND GASES can be hazardous. ARC RAYS can burn eyes and skin.
  4. 4. WELDING can cause fire or explosion.FLYING METAL can injure eyes.
  5. 5. CYLINDERS can explode if damaged.
  6. 6. 1-3. Additional Symbols For Installation, Operation, And Maintenance
  7. 7. SECTION 2 − PRINCIPLES OF SHIELDED METAL ARC WELDING (SMAW)• Shielded Metal Arc Welding (SMAW) or Stick welding is a process which melts and joins metals by heating them with an arc between a coated metal electrode and the workpiece. The electrode outer coating, called flux, assists in creating the arc and provides the shielding gas and slag covering to protect the weld from contamination. The electrode core provides most of the weld filler metal.
  8. 8. SECTION 3 − SHIELDED METAL ARC WELDING (SMAW) PROCEDURE
  9. 9. 3-2. Electrode And Amperage Selection Chart• Electrode E6010 E 60 1 "10" Electrode Tensile strength Position Type of Coating and Current Digit Type of Coating Welding Current 10 High cellulose sodium DC+ 11 High cellulose potassium AC or DC- or DC+ 12 High titania sodium AC or DC- 13 High titania potassium AC or DC+ 14 iron powder titania AC or DC- or DC+ 15 low hydrogen sodium DC+ 16 low hydrogen potassium AC or DC+ 27 iron powder iron oxide AC or DC- or DC+ 18 iron powder low hydrogen AC or DC+ 20 High iron oxide AC or DC- or DC+ 22 High iron oxide AC or DC- 24 iron powder titania AC or DC- or DC+ 28 Low hydrogen potassium iron powder AC or DC+
  10. 10. 3-3. Striking An Arc − Scratch Start Technique
  11. 11. 3-4. Striking An Arc − Tapping Technique
  12. 12. 3-5. Positioning Electrode Holder
  13. 13. 3-6. Electrode Movement During Welding
  14. 14. 3-7. Conditions That Affect Weld Bead Shape
  15. 15. 3-8. Poor Weld Bead Characteristics
  16. 16. 3-9. Good Weld Bead Characteristics
  17. 17. 3-10. Typical Weld Joints
  18. 18. 3-11. Welding Butt Joints
  19. 19. 3-14. Welding Butt Joints 30⁰ 30⁰ Single Pass Flat Butt Joint Weld Or First Pass Of Multi-Layer Deposit
  20. 20. 3-18. Weld Test
  21. 21. SECTION 4 − WELDING TROUBLESHOOTING
  22. 22. SECTION 5 - SYMBOLS• The structure of the welding symbol

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