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NTIS 바로가기Journal of welding and joining = 대한용접·접합학회지, v.34 no.6, 2016년, pp.35 - 41
이우람 (한국국제대학교 기계자동차공학과) , 박태성 (서울과학기술대학교 기계.자동차공학과) , 박익근 (서울과학기술대학교 기계.자동차공학과)
The experimental study has been performed through residual stress using the Ti6Al4V, investigate the effect of laser shock peening on laser welding process residual stress of Ti6Al4V welds in a reduce safety weld zone. This research evaluated the effects of shock waves from laser shock peening with ...
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핵심어 | 질문 | 논문에서 추출한 답변 |
---|---|---|
용접 공정 후 표면 처리 기술은 어떤 것이 있는가? | 용접 공정 후 표면 처리 기술은 용접부 비드 부분에 적용하여 압축 잔류 응력을 생성하여 기계적 특성을 효과적으로 향상 시킬 수 있다. 대표적인 개선 방법으로는 Weld Toe Grinding14), GTAW Dressing15), 압축 잔류 응력 유도법16) 및 피닝 기술17)을 대한으로 표면 처리 기법인 피닝 기술(쇼트, 레이저)이 사용되고 있다18). 피닝 기술의 경우 공정 시간이 짧고 열에너지원이불필요 하며, 전체적인 소성 변형과 미세 조직 변화를 상대적으로 발생시키지 않는 이점이 있다. | |
레이저 쇼크 피닝 공정의 장점은/ | 하지만 압축 잔류 응력의 크기가 제한적이며 정확한 위치의 조정이 불가능하다는 단점이 있다. 반면, 레이저 쇼크 피닝 공정의 경우 압축 잔류 응력이 국부적으로 높으며 정확한 표면 처리 효과를 얻을 수 있는 장점이 있다22-23). | |
용접 공정 시 응고 과정에서 생긴 결함은 어떤 문제를 초래하는가? | 하지만, 용접 공정은 단시간에 높은 열을 인가하므로 용융 후 응고되는 과정에서 주조 결함 및 열적 변형에 의한 결함을 내포하게 된다. 이러한 결함들10)은 응력이 집중되어 초기 균열을 발생시키거나 피로 파괴를 초래하기도 한다11). 특히 용접 공정시 국부적인 열원으로 인해 용접부 주위에서 열적 응력, 냉각 시 수축으로 인한 잔류 응력 및 기타 결함 등이 주요 문제로 제기되고 있다12). |
J. Lee. K. Asim and J. Pan, Modeling of Failure Mode of Laser Welds in Lap-shear Specimens of HSLA Steel Sheets, Engineering and Fracture Mechanics, 78 (2011), 374-396 (in Korean)
R. Shatma, P. Molian and F. Peters, Geometric Variability and Surface Finish of Weld Zones in Yb:YAG Laser Welded Advanced High Strength Steels, Journal of Manufacturing Processes, 12 (2010), 78-84
Chang-Je Lee and Jong-Do Kim, A Study on Correlationship between the Induced Plasma and Emission Signals for In-process Monitoring in Stainless Steel Welding of Fiber Laser (II), J. of Welding and Joining, 32 (6) (2014) 70-74 (in Korean)
Keang-Hyeon Lee, Seong-Wong Choi and Chung-Yun Kang, Effects of laser power on hardness and microstructure of the surface melting hardened SKD61 hot die steel using Yb:YAG disk laser, J. of Welding and Joining, 33 (3) (2015) 54-61 (in Korean)
Ueda Y. and M. G. Yuan, Prediction of residual stress in tand I-joints using inherent strain-A predicting method of welding residual stress using source of residual stress (Report 3), J. of the Japan welding society, 9 (3) (1991) 337-343
J. S. Kim, J. H. Kim, H. Y. Oh, C. Y. Kim, Y. J. Lee, K. S. and T. K. Song, Welding residual stress distributions for dissimilar metal nozzle butt welds in pressurized water reactors, The Korean society of mechanical engineers A, 36 (2) (2012) 137-148
J. Wareing, Fatigue crack growth in a type 316 stainless steel at elevated temperature, Metallurgical Transaction, 6A (1975) 1367-1377
I. Kim, Y. Jung and D. Lee, Improving fatigue strength of weld joints by blast cleaning in painting steel bridge, Journal of the Korean society of steel construction, 23 (3) (2011) 137-146 (in Korean)
C. Lee, M. Park and C. Chang, The study about the fatigue strength improvement mechanism by the processing of fillet welded joint, Journal of the Korean society of steel construction, 11 (3) (1999) 319-327 (in Korean)
P. J. Hagensen, The effects of grinding and peening on the fatigue strength of welded T-joint, International institute of welding (IIW) Document, (1993) XIII-1510-93.
International institute of welding (IIW), Commissions XIII and XV, IIW recommendations on post weld improvement of steel and aluminum structures, IIW Document, (2001) XIII-1815-00
International institute of welding (IIW), Commissions XIII and XV, recommendations for fatigue design of welded joints and components, IIW Document, (2008) XIII-1823-07
Hua Wei Rong, Hyun Jun Lee, Hae Young Jung, Sum Chel Hur and Won Jo Park, A Study on the Shot-Peening Effect for Fatigue Life Improvement of Laser Welding Material, The Korean Society of Ocean Engineers, 24 (2) (2010) 57-61
S. Y. Yang, S. D. Choi, J. M. Jun and B. C. Gong, Improving the residual stress characteristics of the metal surface by Nd:YAG laser shock peening, Journal of the Korean society of manufacturing technology engineers, 19 (4) (2001) 539-547 (in Korean)
C. A. Lavender, S. T. Hong, M. T. Smith, R. T. Johnson and D. Lahrman, The effect of laser shock peening on the life and failure mode of a cold piler die, Journal of materials processing technology, 204 (2008), 486-491 (in Korean)
C. S. Montross, T. Wei, L. Ye, G. Clark and Y. W. Mai, Laser properties of metal alloys, A review, International journal of fatigue, 24 (10) (2002) 1021-1036
Wooram Lee and Joohan Kim, Modeling of a confinement effect in laser shock peening on titanium alloy, Journal of the Korean society of manufacturing technology engineers, 22 (4) (2013) 540-545 (in Korean)
G. R. johnson and W. H. Cook, Fracture characteristics of three metals subjected to various strains, strain rates, temperatures and pressures, Engineering fracture mechanics, 21 (1) (1985) 31-48
Hae Young Jung, A study on the effects of shot peening to the fatigue life of laser welded materials, Ph. D, Thesis, Gyeongsang national university, Jinju, Republic of Korea, (2009) 130-131
Jong-Do Kim, Myung-Sub Kwak and Chang-Soo Kim, A Study of Weldability for Pure Titanium by Nd:YAG Laser(I)-Weld Properties with Shield Conditions-, Journal of KWJS, 27 (5) (2009) 55-61 (in Korean)
Jong-Do Kim, Mying-Sub Kwak, Moo-Keun Song and Seung-Ha Park, A Study of Weldability for Pure Titanium by Nd:YAG(II)-Welding Properties of Butt Welding-, Journal of KWJS, 27 (6) (2009) 68-73 (in Korean)
Jong-Do Kim, Byung-Lea Kil, Myung-Sub Kwak and Moo-Keun Song, A Study of Weldability for Pure Titanium by Nd:YAG(II)-Welding Properties of Edge Welding-, Journal of KWJS, 27 (6) (2009) 74-79 (in Korean)
Byoung-Hyun Yoon, Suk-Hwan Kim and Woogn-Seong Chang, Recent Trends of Welding Technology for Ti and Ti Alloys, Journal of KWJS, 25 (5) (2007) 22-28 (in Korean)
Fujii Nobuyuki, Fukuhara Yoshimasa, Hinata Teruhiko and Yasuda Katsuhiko, Examination of Melting Characteristics of Pure Titanium and Welding Procedure conditions-Welding or Pure Titanium and Joint Performance (Report 1)-, Journal of the Japan Welding Society, 20 (1) (2002) 20-25
Duck-Soo Kang and Kwang-Jin Lee, Recent R&D status on friction stir welding of Ti and its alloys, J. of Welding and Joining, 33 (2) (2015) 1-7 (in Korean)
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