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Al 6082-T6 MIG 용접에서 기공방지를 위한 용접공정 개발
백상엽,정연호,김원일,조상명,Baek, Sang-Yeub,Jung, Yon-Ho,Kim, Won-Il,Cho, Sang-Myung 대한용접접합학회 2010 대한용접·접합학회지 Vol.28 No.6
This paper was described on investigation to prevent porosity in high speed MIG Welding of Al 6082-T6. Porosity measurement was carried out by using image analysis of micrographs with the help of an analysis software. The main parameter was arc length and torch progressive angle. The porosity ratio was increased as arc length was increased. The arc length was increased depending upon the output voltage. By proper selection of pulse waveform parameter, the stable arc of one pulse one drop was generated. The porosity ratio of optimum condition in one pulse one drop was lower than high voltage condition. When torch progressive angle was an angle of advance $10^{\circ}$, porosity ratio was minium.
Al6082-T6의 MIG용접부에서 입열량에 따른 열영향부의 연화와 인장특성에 관한 연구
백상엽,박경도,김원일,조상명,Baek, Sang-Yeob,Park, Kyung-Do,Kim, Won-Il,Cho, Sang-Myung 대한용접접합학회 2011 대한용접·접합학회지 Vol.29 No.1
Al6082-T6 is widely used because of its corrosion resistance and excellent strength. HAZ softening occurs in MIG welding process for this aluminium alloys because this aluminium alloy is heated to higher temperature than its aging temperature during welding. Therefore, low heat input and minimum standard deviation of heat input are required for narrow HAZ width and, for higher strength of welds. In this study, Al6082-T6 was used to examine for HAZ softening with various heat input in aluminium MIG welding. For weldments, micro hardness was measured and tensile test was carried out. Minimum hardness was increased at high speed welding such as 80cm/min and 120cm/min in welding speed comparing with 40cm/min. Also, in case of high speed welding such as 80cm/min and 120cm/min, tensile strength of weldments was increased about 10% comparing with low speed welding(40cm/min).
백상엽 한국알타이학회 2014 알타이학보 Vol.0 No.24
The verbal suffix -du takes a flexible position in verbal predicate structuresaccording to the given verb form (i.e., finite/participle). There has beendisagreement regarding the grammatical function of the suffix -du thatprecedes the finite verb forms in previous work. Nikolaeva and Tolskaya(2001) claim that -du is used to mark the third person plural subject. Kazama (2007a, 2008a), on the other hand, rebuts this claim since theposition of -du is apparently different from the position of other personmarkers. Rather, Kazama claims that -du should be defined as a verbalderivational suffix, which is closely associated with plurality and directevidentiality. Furthermore, no specific study has been made on the suffix-du that follows the participle verb forms. Thus, this paper has reexaminedthe grammatical function of the verbal suffix -du, both in the finite andparticiple verbs, with reference to textual materials and elicitation data inUdihe. We conclude that the verbal suffix -du, in the finite verb, optionallyserves as the third person plural marker, since Udihe lost the Tungusicnominal plural suffix -l (which can indicate the third person plural in mostTungusic languages) in the process of phonetic change. The verbal suffix-du in the participle verb (present and past tense only) is used in the thirdperson plural, expressing direct evidentiality. The use of the verbal suffix-du in the participle may be another realization of the finite tense formsince they have evidentiality and syntactic function in common.
GMAW용접에서 와이어의 돌출길이와 전류 및 전압이 알루미늄 재료에 미치는 영향
백상엽(Sang-Yeob Baek),김법헌(Bub-Hun Kim),이칠순(Chil-Soon Lee) 산업기술교육훈련학회 2010 산업기술연구논문지 (JITR) Vol.15 No.1
As the industrial environment is changed rapidly, organized welding method about nonferrous metals is needed. Taking the advantages of Aluminum that is light and no risk of corrosion, Aluminum has been used for the area of automobile, aircraft, shipbuilding and so forth. Therefore it is unavoidable tendency to weld using Aluminum material. The most important flaw is welding cracks that happen on Aluminum welding. These are high temperature cracks, and they are mainly occurred by segregation of alloyed element in crystal particles or existence of low melting point substance. Blow holes are easier to happen than other metals, Hydrogen is informed as the direct cause of blow holes. Aluminum is easy to be influenced by oxygen of humidity as long as add some heat from outside, so it is difficult to weld and changes its form easily. We welded on this Aluminum material by changing projected length and checked the point to get excellent welding at how much distance. For this study we used pure Aluminum material and Alloy ER 4043 φ1.2 welding rod, also automatic feed mechanism and 500A GMAW machine are used for accurate and stable welding. After welding, we seized internal defects through nondestructive testing and operated hardness test on welding part. After that, we endeavored to look for the conditions by measuring the changes of penetration. Through this study we gained the result about what changes happen on Aluminum material by the difference of projected length, electric current, and voltage in GMAW welding.
백상엽(Sang-Yeob Baeg),우종수(Jong-Soo Woo),이상복(Sang-Bok Lee) 산업기술교육훈련학회 2010 산업기술연구논문지 (JITR) Vol.15 No.1
The chatter vibration, occuring in the machining process by endmill, has bad effects on the life of tool, productivity and accuracy of machining surface, due to the relative vibration between the workpiece and the tool. A conventional endmill which all four blades are 30° helix angles and a different helix angle endmill which the opposite two blades are 30° and the other opposites are different helix angles were studied. In this study, in order to find the endmill which is directly available in industry and has an excellent anti-vibration effect with less machining error. Machining error was increased in case of 3mm cutting depth, due to the deflection of the endmill and the deformation of specimen, as helix angle increases. In the surface roughness, as RPM was increased, the surface quality was improving. We obtained that a type(30°+33°) showed the most excellent surface in case of 3mm cutting depth in down milling, and in case of up milling a type(30°+30°) showed the most excellent surface.