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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.
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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.
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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.
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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
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이창희,장래웅 대한금속재료학회(대한금속학회) 1993 대한금속·재료학회지 Vol.31 No.6
The LASER weldability response (solidification cracking and cold cracking susceptibility) of austenitic, ferritic and martensitic grades revealed a significant alloy to alloy and heat to heat variation. the ferritic and martensitic alloys appeared to be less sensitive to solidification cracking but sensitive to cold cracking such that when the hydrogen content in shielding gas increased the fracture strength and time decreased, indicating that LASER welding of these grades should be kept from absorption of hydrogen. On the other hand, austenitic alloys showed a high propensity to solidification (hot) cracking in stead of cold cracking. Sensitivity was predominantly dependent upon the primary solidification mode (Cr_(eq)/Ni_(eq)) and impurity (S, P, Si) contents.
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김기수,장래웅,남재복,최원집 대한금속재료학회(대한금속학회) 1994 대한금속·재료학회지 Vol.32 No.5
No single test can accurately predict the press shop formability of sheet metal and provide reproducibility of measured data. However a Limiting Dome Height(LDH) test was developed to specifically rank sheet metals for forming operations. The dome height at plane-strain state, which is the typical failure condition in many automotive stamping process is used as the criterion for sheet metal formability. Moreover, the strain state at failure in the test can duplicate the various strain state at failure in actual stamping operations by oaring the sample width and lubrication condition. In this study the difference between the FLD and the LDH tests was investigated and the LDH curves of various low carbon steel sheets were compared to yield a ranking of materials used in press shop. It was found that lubrication(or friction) was no less important than material itself in LDH values and no significant differences in punch speed and blank holder force(BHF) during the test were observed. A high LDH value is therefore, resulted at low interface friction allowing uniform distribution of strains. The relevance of the plane-strain LDH values with real stamping was checked by material control limit obtained from statistical deformation control chart for wheel house inner blanks.
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