표제지
목차
국문요약 10
Abstract 11
제1장 서론 13
제2장 이론적 배경 15
2.1. 용접 (Welding)의 종류 15
2.1.1. 마찰 교반 용접 (FSW: Friction Stir Welding) 15
2.1.2. 레이저 용접 (Laser beam welding) 15
2.1.3. 아크 용접 (Arc welding) 15
2.2. 스테인리스 강 (Stainless Steel) 18
2.2.1. 스테인리스강의 분류 18
제3장 실험 및 평가 22
3.1. 재료 및 용접 방법 22
3.2. 침투탐상시험 (PT: Liquid Penetrant Testing) 24
3.3. 마크로시험 (Macro Test)을 이용한 용접부 단면 관찰 26
3.4. 인장 강도 시험 (Tensile Strength Test) 26
제4장 결과 및 고찰 29
4.1. 침투탐상시험을 통한 표면 미세결함 관찰 29
4.2. 용접부 단면 관찰 및 인장강도 시험 31
4.2.1. 토치각도 45° 간격 0mm 31
4.2.2. 토치각도 45° 간격 1mm 34
4.2.3. 토치각도 60° 간격 0mm 37
4.2.4. 토치각도60° 간격 1mm 40
제5장 결론 44
참고문헌 45
Table 1. Raw data of measured values at 45° torch angle and 0 mm gap... 32
Table 2. Raw data of measured values at 45° torch angle and 1 mm gap... 35
Table 3. Raw data of measured values at 60° torch angle and 0 mm gap... 38
Table 4. Raw data of measured values at 60° torch angle and 1 mm gap... 42
Figure 1. Schematic illustration of representative welding process; (A) Friction... 17
Figure 2. Classification of stainless steel. The STS were classified into five... 19
Figure 3. Schematic diagram of STS444 lap joint welding by various parameters... 23
Figure 4. (A) The procedure of the PT (Liquid Penetration Test), (B) Liquid... 25
Figure 5. Macro test quality standard dimension according to Hyundai-Kia... 27
Figure 6. (A) Illustration of the size and welding zone of tensile specimens, (B)... 28
Figure 7. Image of penetrant test (PT) result. (A) Images of the indications... 30
Figure 8. (A) Surface and cross-section(inset) images after welding 45° torch... 33
Figure 9. (A) Surface and cross-section(inset) images after welding 45° torch... 36
Figure 10. (A) Surface and cross-section(inset) images after welding 60°... 39
Figure 11. (A) Surface and cross-section(inset) images after welding 60°... 43