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알루미늄 합금의 용접특성 - part I : 균열 및 기공
이창희,장래웅 대한용접접합학회 1992 대한용접·접합학회지 Vol.10 No.3
A literature review was conducted to survey informations available on the welding metallurgy of aluminum alloys and its effect on fusion weldability, especially on solidification cracking and pore formation. Solidification cracking behavior of Al weld is a complicate matter as compared to other high alloys, where a relatively simple Fe-X(most detrimental elements S, P, B, Si, etc) binary diagram can be successfully applicable. Both additive and synergistic effects of elements should be considered together. A same element play a different role from system to system. Porosity, caused by hydrogen contamination of the weld is one of the most troublesome welding problems. The primary sources of hydrogen are believed to be an absorbed moisture on the filler metal or base metal and in the shielding gas. It is extremely important that reliable quality-control procedures be employed to eliminate all possible sources of hydrogen contamination. Selection of proper process and parameters is sometimes more important than controlling of alloying elements in order to make a defect-free weld.
최광,장래웅,엄기원,Choi, K.,Chang, R.W.,Eom, G.W. 대한용접접합학회 1990 대한용접·접합학회지 Vol.8 No.3
Temperature distribution of thick plate during welding was investigated. Applied weldng process was shielded metal arc welding which was known as one of the most utilized processes in fabrication fields. Heating and cooling cycles were recorded by imploying high fidelity recorded and K-type thermocouple of 0.3mm in diameter. Both analytical and numerical calculations were preformed so as to verify the thermal cycle measurement. Results showed that the temperature of a welded points at given time could be predicted by the theoretical calculations. It was considered that methods could be applied to real structural components with slight modification.
김기수,장래웅,남재복,최원집 대한금속재료학회(대한금속학회) 1993 대한금속·재료학회지 Vol.31 No.2
In the steel D&I can-making industry, there has been a tendency of increasing the punch speed to meet the needs of high productivity. Owing to high punch speed, however, produced can occasionally shows dull and scratched surface which is called frosting phenomenon. In the present work, to investigate the effects of various factors on the frosting, steel D&I can-making was carried out with facilities of commercial line and ironing simulator of lavoratory scale. The frosting seemed to be influenced by the number of ironing steps and the characteristics of coating layer of tinplate. Tinplates resulting in lightly frosted cans were observed to have less surface oxides and Fe+Sn alloyed layers than those of heavily frosted cans. They had also developed preferred orientation of (101) plane. In laboratory scale experiments, it was found that the frosted area was decreased with decreasing thickness reduction ratio of final ironing die.
김영석,장래웅,최원집 대한기계학회 1992 대한기계학회논문집 Vol.16 No.4
본 연구에서는 고속, 연속장업으로 이루어지고 있는 스템핑 공정에서 금형과 강판간의 접촉-슬립에 따른 마찰 및 윤활특성의 성능을 평가할 수 있도록 한 원형단면 형상의 드로오비드 마찰실험장치를 활용하여 가압력, 윤활유 특성, 드로잉 속도와 강 판의 표면특성 등에 따른 자동차용 냉연강판과 도금강판의 마찰계수와 드로오비드 저 항력에 대한 테이터 베이스를 구축하고자 한다. In developing computer-aided design technology for optimization of stamping die design, it has been an important issue to treat the frictional constraint acting on the blank holder surface. The main goal of this work is to establish database of draw bead restraint force and clarify friction characteristic for various automotive sheet steels, which is essential in developing friction algorithm that can be used for CAD of stamping die design. Draw bead friction tester is used to evaluate the various parameters that affect the draw restraint force and the coefficient of friction for the cold rolled and the coated sheet steels such as drawing rate, lubricant type, surface property of material, etc.
김영호,장래웅,이윤용 대한금속재료학회(대한금속학회) 1994 대한금속·재료학회지 Vol.32 No.1
High temperature oxidation of Fe-13%Cr and Fe-17%Cr stainless steels at the temperatures between 1200℃ and 1300℃ in dry oxygen environment has been studied. The oxidation rate was more influenced by the partial pressure of oxygen than the temperature. The oxidation was proceeded by forming nodular oxides at the scale/metal interface. The decrease in oxidation rate with increasing temperature was due to the prevention of nodular oxide growth at the scale/metal interface by lowering oxygen potential which was caused by the evaporation of CrO₃(g). The scale breakaway of the Cr₂O₃ layer formed at the scale/metal interface was restrained by the formation of internal oxides constituting mainly of SiO₂
이창희,장래웅 대한용접접합학회 1993 대한용접·접합학회지 Vol.11 No.1
A literature review was conducted to gather informations available on the welding metallurgy of aluminum alloys, emphasized on characteristics in the heat affected zone(HAZ). Nominal metallurgical reactions that occur in aluminum alloys provide a basis for understanding aluminum welding metallurgy. However, welding reactions differ to some extent because of the relatively short times involved, and the non-isothermal heating excursed. For non-heat treatable alloys, welding primarily affects these alloys by annealing (recrystallization and growth) and to a less extent, changes in low temperature precipitates. In the case of heat treatable alloys, the resulting HAZ properties depend upon alloy composition, starting temper, heat input and post weld heat treatments.