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Nomenclatures 13

Abstract 15

1. 緖論 17

1-1. 硏究背景 17

1-2. 硏究의 必要性 18

1-3. 硏究目的 20

2. 理論考察 21

2-1. 레이저 容接의 原理 21

2-2. 레이저 工程變數 24

2-3. 레이저 빔의 吸收率 25

2-4. 레이저 이종 용접시 考慮事項 27

3. 實驗裝置 및 實驗方法 28

3-1. 實驗材料 28

3-2. 實驗裝置 29

3-3. 硏究方法 33

3-3-1. 연속파형 Nd:YAG 레이저의 容接方法 33

3-3-2. 容接部 形象 및 組織 觀察法 35

3-3-3. 機械的 特性 平價方法 37

4. 結果 및 考察 41

4-1. STS 304의 容接性 41

4-2. STS 304 최적의 맞대기 容接 特性 47

4-3. Inconel 600의 容接性 55

4-4. Inconel 600과 STS304의 異種 容接 特性 66

4-4-1. 異種 容接部의 機械的 特性 68

4-4-2. 異種 容接部의 金屬組織 特性 80

5. 結論 91

References 92

감사의 글 94

List of Tables

Table 1. Laser Welding Parameters 24

Table 2. Chemical component of Materials 28

Table 3. Mechanical & Physical properties of Materials 28

Table 4. Welding Conditions of CW Nd:YAG laser 33

Table 5. Tensile test of standard (KS B 0810 13B) 37

Table 6. Experimental equation 46

Table 7. Experimental conditions of welding of Inconel 600 and STS304 67

Table 8. Experimental results of stress test of specimen 68

Table 9. Photograph of fractured region in butt welding tensile test specimens 69

List of Figures

Fig. 1. Schematic diagram of laser keyhole welding 23

Fig. 2. Relation between reflected rate and wave length 26

Fig. 3. Schematic diagram of the experimental setup 29

Fig. 4. Schematic diagram of the toleration face gap 33

Fig. 5. Geometry of samples for tensile test 37

Fig. 6. Spot size and Focal position according to Laser power 600W 43

Fig. 7. The relations between focal position and spot size 44

Fig. 8. The relation between focal position and power density 45

Fig. 9. The relations between power and spot size 46

Fig. 10. The Welding width and Welding depth on the welding speed per unit time (m/min) at the power 2kW, z=0.5, Ar=4ℓ/min 49

Fig. 11. The aspect ratio on the welding speed per unit time (m/min) P=2kW, z=-0.5, Ar=4ℓ/min 50

Fig. 12. The welding width and welding on the focal position(z=0), speed=2.5m/min, P=1.5kW, z=0, Ar=4ℓ/min 51

Fig. 13. The aspect ratio on the focal position (z=0~±6), power=1.5kW, z=0, Ar=4ℓ/min 52

Fig. 14. Cross-section of but welding with gab of 40㎛, 46.38㎛, 65㎛, 100㎛, 150㎛ and 319㎛ 53

Fig. 15. The relations between tensile strength and welding gap 54

Fig. 16. Spot size and Focal position according to Laser power 400W 56

Fig. 18. Spot size and Focal position According to Laser power 600W 58

Fig. 19. Spot size and Focal position According to Laser power 700W 59

Fig. 20. The relations between focal position and spot size 60

Fig. 21. Bead on Plate Welding Bead in p=1.5kw, s=1m/min, z=0, Ar:5.5ℓ/min 61

Fig. 22. Bead on Plate Welding Bead in p=1.7kW, s=1m/min, z=0, Ar:5.5ℓ/min 62

Fig. 23. Bead on Plate Welding Bead in p=1.9kW, s=1m/min, z=0, Ar:5.5ℓ/min 63

Fig. 24. Butt welding bead in p=2kW, S=2m/min, z=0, Ar:5.5ℓ/min 64

Fig. 25. Butt welding bead in P=2kW, S=2m/min, z=0, Ar:5.5ℓ/min 65

Fig. 26. Tensile stress of butt welding Inconel600 & Inconel600 (welding speed: 1.5m/min) 70

Fig. 27. Tensile stress of butt welding Inconel600 & Inconel600 (welding speed: 1.5m/min) 70

Fig. 28. Tensile stress of butt welding Inconel600 & Inconel600 (welding speed: 1.8m/min) 71

Fig. 29. Tensile stress of butt welding STS304 & STS304 (welding speed: 1.2m/min) 71

Fig. 30. Tensile stress of butt welding STS304 & STS304 (welding speed: 1.5m/min) 72

Fig. 31. Tensile stress of butt welding STS304 & STS304 (welding speed: 1.8m/min) 72

Fig. 32. Tensile stress of butt welding Inconel600 & STS304 (welding speed: 1.2m/min) 73

Fig. 33. Tensile stress of butt welding Inconel600 & STS304 (welding speed: 1.5m/min) 73

Fig. 34. Tensile stress of butt welding Inconel600 & STS304 (welding speed: 1.8m/min) 74

Fig. 35. Tensile stress of Inconel600 74

Fig. 36. Tensile strength of STS304 75

Fig. 37. Comparison of tensile strength for welding speed of Inconel600 (P=2kW, z=0, Ar=5.5ℓ/min, s=1.2, 1.5, 1.8m/min) 76

Fig. 38. Comparison of tensile strength for welding speed of STS304 (P=2kW, z=0, Ar=5.5ℓ/min, s=1.2, 1.5, 1.8m/min) 77

Fig. 39. Comparison of tensile strength for welding speed of Inconel600 & STS304 (P=2kW, z=0, Ar=5.5ℓ/min, s=1.2, 1.5, 1.8m/min) 78

Fig. 40. The relations between tensile strength and welding speed (Inconel600 & Inconel600, STS304 & STS304, Inconel600 & STS304) 79

Fig. 41. Cross section of welding bead 3mm thick (Inconel600 & Inconel600, STS304 & STS304, Inconel600 & STS304) 81

Fig. 42. Photomicrograph showing laser butt welding (Inconel600 & Inconel600 p=2kw, s=1.2m/min, Ar=5.5ℓ/min, z=0) 82

Fig. 43. Photomicrograph showing laser butt welding (Inconel600 & Inconel600 p=2kw, s=1.5m/min, Ar=5.5ℓ/min, z=0) 83

Fig. 44. Photomicrograph showing laser butt welding (Inconel600 & Inconel600 p=2kw, s=1.8m/min, Ar=5.5ℓ/min, z=0) 84

Fig. 45. Photomicrograph showing laser butt welding (STS304 & STS304 p=2kw, s=1.5m/min, Ar=5.5ℓ/min, z=0) 85

Fig. 46. Photomicrograph showing laser butt welding (STS304 & STS304 p=2kw, s=1.5m/min, Ar=5.5ℓ/min, z=0) 86

Fig. 47. Photomicrograph showing laser butt welding (Inconel600 & STS304 p=2kw, s=1.2m/min, Ar=5.5ℓ/min, z=0) 87

Fig. 48. Photomicrograph showing laser butt welding (Inconel600 & STS304 p=2kw, s=1.5m/min, Ar=5.5ℓ/min, z=0) 88

Fig. 49. Photomicrograph showing laser butt welding (Inconel600 & STS304 p=2kw, s=1.8m/min, Ar=5.5ℓ/min, z=0) 89

Fig. 50. X-Ray Photograph showing laser butt welding 90

List of Photographs

Photo 1. Experimental setup for butt welding(2kW CW Nd:YAG Laser - TRUMPF HL2006D) 30

Photo 2. Laser Welding Head 31

Photo 3. CW Nd:YAG Laser Osillator 32

Photo 4. Jig for butt welding 34

Photo 5. Grinding & Poloshing Machine 36

Photo 6. Metal Micoscope 36

Photo 7. Micro Vickers Hardness Tester 38

Photo 8. Samples for tensile test specimens(top STS304, bottom Inconel600) 39

Photo 9. Unicersal Testing Machine 40

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