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유한요소해석을 이용하여 파이버 레이저 용접으로 T형 구조물 용접 시 최적 조건 도출을 위한 연구
표창민,김재웅 한국기계기술학회 2022 한국기계기술학회지 Vol.24 No.6
Welding is a representative processing technology applied in many industrial sites due to its quality and convenience. In particular, fiber laser welding can be welded at a faster speed compared to arc welding, and there is an advantage in welding distortion, which is the most significant disadvantage of welding. In this study, the weldable thickness was predicted, and the optimal welding angle was estimated using simulations during the welding of the T-shape structure. The multi-layer heat source model proposed in the previous author's study was used, and the study was conducted using the proposed welding heat source under specific conditions of 4kw and 1.0m/min. As a result, it was predicted that high-quality welding would be possible when the thickness was 3mm or 4mm, and it was also confirmed that welding should be performed at an angle of 82.5° or more when welding a 3mm thick structure. As a follow-up study, we plan to build a welding heat source model under various conditions and conduct a study to derive welding conditions at various thicknesses.
원통형 이차전지의 저항용접 품질 향상을 위한 공정 최적화
정지선,박순서,김지호,권혁무,홍성훈,이민구 한국품질경영학회 2020 품질경영학회지 Vol.48 No.1
Purpose: This study aims to determine the optimal conditions for the spot welding process that mechanically connects the case of a cylindrical secondary battery and the negative tab. Methods: We use 33 factorial design to derive the optimal conditions for the spot welding process. The pulling strength, the cross-sectional area of nugget, and the shock test life are selected as response variables, which can represent the resistance welding quality. The input variables are selected as the welding time, welding voltage, and pressure, which are the controllable factors in the spot welding process. Results: The main effects of welding time and welding voltage and the interaction effect of welding time and welding voltage are significant. Conclusion: The optimal conditions for the spot welding process to mechanically join the negative electrode tab of the cylindrical secondary battery and the battery case are developed. The result shows that the pulling strength is increased by 44% compared to before improvement under optimal conditions.
맞대기 V-그루브 이음 초층 용접에서 최적의 용접조건 선정
윤석철,김재웅,Yun, Seok-Chul,Kim, Jae-Woong 대한용접접합학회 2009 대한용접·접합학회지 Vol.27 No.1
In case of manufacturing the high quality welds or pipeline, the full penetration weld has to be made along the weld joint. Thus the root pass welding is very important and has to be selected carefully. In this study, an experimental method for the selection of optimal welding condition was proposed in the root pass welding which was done along the V-grooved butt weld joint. This method uses the response surface analysis in which the width and height of back bead were chosen as the quality variables of the weld. The overall desirability function, which is the combined desirability function for the two quality variables, was used as the objective function for getting the optimal welding condition. In the experiments, the target values of the back bead width and the height are 6mm and zero respectively for the V-grooved butt weld joint of 8mm thickness mild steel. The optimal welding conditions could predict the back bead profile(bead width and height) as 6.003mm and -0.003mm. From a series of welding test, it was revealed that a uniform and full penetration weld bead can be obtained by adopting the optimal welding condition which was determined according to the method proposed.
선박 곡블록의 경사 필렛 이음부의 적정 용접조건 (Ⅰ)
박주용(JU-YONG PARK) 한국해양공학회 2004 韓國海洋工學會誌 Vol.18 No.6
The curved blocks which compose the bow and stern of a ship contain many skewed joints that are inclined horizontally and vertically. Most of these joints have a large fitness error and are continuously changing their form and are not easily accessible. The welding position and parameter values should be appropriately set in correspondence to the shape and the inclination of the joints.<br/> The welding parameters such as current, voltage, travel speed, and melting rate, are related to each other and their values must be in a specific limited range for the sound welding. These correlations and the ranges are dependent up on the kind and size of wire, shielding gas, joint shape and fitness. To determine these relationships, extensive welding experiments were performed. The experimental data were processed using several information processing technologies. The regression method was used to determine the relationship between current voltage, and deposition rate.<br/> When a joint is inclined, the weld bead should be confined to a the limited size, inorder to avoid undercut as well as overlap due to flowing dawn of molten metal by gravity. The dependency of the limited weld size which is defined as the critical deposited area on various factors such as the horizontally and vertically inclined angle of the joint, skewed angle of the joint, up or down welding direction and weaving was investigated through a number of welding experiments. On the basis of this result, an ANN system was developed to estimate the critical deposited area. The ANN system consists of a 4 layer structure and uses an error back propagation learning algorithm. The estimated values of the ANN were validated using experimental values.
자동차 부품용 강재(SM40C)의 마찰용접 최적화와 AE에 의한 실시간 품질평가에 관한 연구
오세규(Sae Kyoo Oh),박종배(Jong Bae Park),공유식(You Sik Kong) 한국해양공학회 1999 韓國海洋工學會誌 Vol.13 No.1
This paper presents the experimental examinations and statistical quantitative analysis of the correlation between the cumulative counts of acoustic emission(AE) during plastic deformation periods of the welding and the tensile strength and other properties of the bar-to-bar welded joints of O.D. 16㎜ shaft(SM40C) as well as the various welding variables. And this is a new approach which attempts finally to develop real-time quality monitoring system for friction welding. The results lead to a practical possibility of real-time quality control more than 100% joint efficiency showing good weld with no micro structural defects.
STS316L의 초층용접 시 최적의 용접조건 선정에 관한 연구
박창언 ( Chang Eun Park ),정재원 ( Jae Won Jeong ) 조선대학교 공학기술연구원 2010 공학기술논문지 Vol.3 No.1
Recent trends of robotic arc welding system have been focused on the development of new process in order to achieve better quality, higher productivity and cost savings in welding process. In case of manufacturing the full penetrated welding for the high quality welds or pipeline has be made along the weld joint. Thus the root-pass welding is very important to be selected carefully. Since the rob tic GTA(Gas Tungsten Arc) welding is particularly a complex process to produce high quality joints for stainless metal, a capability of full automation based on how to establish a mathematical model that can predict the result of the actual welding process and how to select the optimum welding condition should be required. Therefore deciding the optimal welding condition is an effective method on basis of the experimental data. However, using a trial-and-error method from the beginning in such a wide area, determination of the optimal condition requires too many numbers of experiments. In this study, an intelligent algorithm to determine welding parameter for loot-pass and welding position in pipeline welding has been proposed.
터빈용 내열강의 이종재 마찰용접 최적화와 AE에 의한 품질 실시간 평가에 관한 연구(Ⅰ) - 마찰용접 최적화
박형동(Hyung Dong Park),오세규(Sae Kyoo Oh),권상우(Sang Woo Kwon) 한국해양공학회 1999 韓國海洋工學會誌 Vol.13 No.3(Ⅰ)
Taking a view of joining by welding the IN713C to SCM440 and SCM415 steel in production of turbochargers, the friction welding process may be utilized as a new approach for joining them instead of other conventional welding processes. It is because the friction welding has more technical and economic advantages than the other welding processes. As this welding process has the characteristics such as curtailment of production time and materials and cost reduction, etc., So, this paper deals with determining the proper friction welding condition and analyzing various mechanical properties of friction welded joints of the super heat resisting steel to alloy steel(IN713C to SCM440 and SCM415). And the in-process real-time weld quality evaluation technique by acoustic emission during friction welding of IN713C to SCM440 and SCM415 steels with higher confidence and reliability has been much required even though it might be the first trial approach for developing it. Then, this first study aimed to develop the optimization of dissimilar friction welding of heat resisting steels (INC713 to SCM440, SCM415) for turbine, considering on strength and toughness.
Jeong-Soo Lee,Jin-Oh Yun,Dong-Yong Lim,Yong-Won Jang,Bong-Joon Kim,Chong-In Oh 한국소성가공학회 2010 기타자료 Vol.2010 No.6
This paper is focused on application submerged arc welding process, which offers many advantages compared to conventional CO₂ welding process, for thin plate in ship structure. For this purpose, optimized welding conditions are determined according to combination of wire & flux, relationship between welding parameters, bead shapes and mechanical tests such as tensile, bend and hardness. Also finite element(FE) based numerical simulation of thermal history and welding residual stress in welded joint of A-grade 3.2 thickness steel has been checked to qualitative tendency in this paper. In conclusion our company applied to this method in work piece and it was no problem. From the result of this study, it makes substantial saving of time and manufacturing cost and raises the welding quality of product.
A6061 알루미늄합금 판재의 맞대기 TIG용접에서 반응표면법을 이용한 최적용접조건선정에 관한 연구
정성훈(Sunghun Jung),이도엽(Doyup Lee),김봉율(Bong Ueoul Kim),이목영(Mokyoung Lee) 대한용접·접합학회 2018 대한용접·접합학회지 Vol.36 No.3
In this study, aluminum alloy sheet was welded on I-butt joint using AC type TIG welding machine. Welding conditions were designed with CCD(Central Composite Design) method in which input variables were welding current and travel speed. TIG welding was done on A6061 alloy sheet for the welding conditions at Ar shielding. The second-order regression equation was obtained using Minitab R18 with the bead shape measured from TIG welded samples. The optimum weld bead shape selected from the surface response graphs was effective penetration depth 1.78mm, upper bead width 5.36mm and sagging 0.39mm. And the correspond welding condition was welding current 115A and travel speed 5.7m/min. The reliability of the calculated regression equation for bead shape was varied from 90% of sagging to 98.7% of upper bead width.