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HAZ and Heat Input

HAZ and Heat Input. Basic Metal Structures. III. Interstitial Atom. II. Substitutional Atom. I. Pure Metal. Basic Metal Structures. I. Simple Cubic. II. Body Centered Cubic (BCC). III. Face Centered Cubic (FCC). Al, Cu, Ni. Fe, Cr. Temperature. % C. Iron-Carbon Diagram.

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HAZ and Heat Input

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  1. HAZ and Heat Input

  2. Basic Metal Structures III. Interstitial Atom II. Substitutional Atom I. Pure Metal

  3. Basic Metal Structures I. Simple Cubic II. Body Centered Cubic (BCC) III. Face Centered Cubic (FCC) Al, Cu, Ni Fe, Cr

  4. Temperature % C Iron-Carbon Diagram

  5. Mechanical Mixtures Lamellar Coarse Pearlite Slow Cooling High Ductility Low Strength Fine Pearlite Moderate Cooling Moderate Ductility Moderate Strength Bainite Rapid Cooling Low Ductility High Strength

  6. Martensite Body Centered Tetragonal BCT Very Rapid Cooling Martensite Carbon has no chance to diffuse Metastable Phase Acicular (Needle) Structure Lowest Ductility Highest Strength

  7. Tempered Martensite Heating from Martensite Carbon gets able to diffuse Some relaxation. Restore ductility Keep strength at moderate levels

  8. HT Annealing Normalizing Oil Quenching Water Quenching Temperature Time

  9. Tempering Temperature Time HT

  10. Solidification Coarse Grain Size Liquid Fine Grain Size

  11. Dendrites Solidification

  12. Welding Zones Temperature % C

  13. Welding Zones Temperature

  14. Temperature HAZ Temp. Preheat Welding Zones

  15. Welding Zones • Two factors can control the rate of cooling: • 1- Heat Input • Power • Traveling Speed • 2- Preheat

  16. Welding Zones Three factors can not be controlled: 1- Carbon Equivalent 2- Thickness 3- Thermal Conductivity.

  17. HAZ

  18. HAZ and Heat Input

  19. HAZ and Heat Input

  20. HAZ and Heat Input

  21. LBZ

  22. HAZ (Grain Growth Diagram)

  23. Without Clamping Distortion and Residual Stresses

  24. Stress Strain Distortion and Residual Stresses

  25. Distortion and Residual Stresses Stress Strain

  26. Distortion and Residual Stresses Stress Strain

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