서지주요정보
아크 및 레이저 용접의 용융풀 거동에 관한 동적 해석 = Dynamic analysis of molten pool behavior in arc and laser welding
서명 / 저자 아크 및 레이저 용접의 용융풀 거동에 관한 동적 해석 = Dynamic analysis of molten pool behavior in arc and laser welding / 고성훈.
저자명 고성훈 ; Ko, Sung-Hoon
발행사항 [대전 : 한국과학기술원, 2001].
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소장정보

등록번호

8012243

소장위치/청구기호

학술문화관(문화관) 보존서고

DME 01021

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초록정보

The dynamic behavior and geometry of GTA as well as laser weld pools have significant effects on the weld quality. Most of the previous studies are limited due to simplified geometry and assumptions. In this study, effects of surface depression on convection and geometry of stationary GTA and laser weld pools are simulated numerically by adopting the Volume of Fluid (VOF) method. The effects of arc pressure, electromagnetic force and surface tension gradients on surface depression, convection and temperature distribution are calculated for the GTA weld pool. Formation and collapse of the laser keyhole are also predicted using the VOF method. The pool surface is depressed mainly by arc pressure and the top surfaces of fully penetrated weld pools are easily depressed since they are only supported by surface tension. As the current increases, surface depression affects the pool geometry. Deep penetration by the pulsed current is generated mainly by surface depression produced by arc pressure at the peak current period. The burn-through phenomena and weld pool oscillation are also predicted numerically. In the area of laser welding, the preliminary studies are performed to predict the mechanism of keyhole formation and collapse considering multiple reflection of laser beam and resultant recoil pressure. The aspect ratio of the keyhole is increased by Marangoni flow. Keyhole is calculated to collapse at middle region of almost vertical wall where absorption energy is low. It is found that other mechanisms should be considered to maintain stationary keyhole in addition to the recoil pressure by multiple reflection.

서지기타정보

서지기타정보
청구기호 {DME 01021
형태사항 xii, 141 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Sung-Hoon Ko
지도교수의 한글표기 : 유중돈
지도교수의 영문표기 : Choong-Don Yoo
수록잡지명 : "Effects of surface depression on pool convection and geometry in stationary GTAW". Welding journal, accepted
수록잡지명 : "Mathematical modeling of the dynamic behavior GTA weld pools". Metallurgical and materials transactions, accepted
학위논문 학위논문(박사) - 한국과학기술원 : 기계공학전공,
서지주기 참고문헌 : p.138-141
주제 아크 용접
레이저 용접
용융풀
진동
키홀
arc welding
laser welding
weld pool (or molten pool)
oscillation
keyhole
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