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지르칼로이-4 박판의 3 점 굽힘 시험에 의한 요오드 응력부식균열 특성 연구
강봉용,황선근 대한금속재료학회(대한금속학회) 1988 대한금속·재료학회지 Vol.26 No.5
The stress corrosion cracking (SCC) characteristics of Zircaloy-4 sheet in iodine vapour environment were studied by three point bending method. SCC tests were conducted in an iodine vapour evironment with the concentration of 20 ㎎/㎤ at 300℃ in which the crack growth rate, fracture surface morphology and the effect of crystallorgraphic texture on the SCC susceptibility were determined. Specimens of as-received, furnace cooled and oil quenched from the β-phase region, respectively, were precracked in an iodine-methanol solution. The crack growth rate formula after Kreyns, da/dt=c.K^n, were applicable to the test results. The vague of the exponent n ranged from 1.8 to 2.8. The varue of n decreased with the increase of the intensity of the normal basal pole texture, which suggested that the crystallographic texture influenced the SCC susceptibility. A mixed mode of transgranular and intergranular fracture was observed in the as-received specimen. Transgranular fracture mixed with cleavage was predominant in the heat-treated specimens.
강봉용,김희진 대한용접접합학회 1993 대한용접·접합학회지 Vol.11 No.3
본 고에서는 폭발접합에 대한 원리, 접합계면 특성 및 접합공정에 영향을 미치는 변수들에 대하 여 기술하였다. 폭발접합은 접합장소에 대한 제약을 제외하고는 저렴한 시설 투자 및 간편한 방 법으로 고부가치의 제품을 생산할 수 있는 장점 때문에 선진 외국에서는 각종 산업분야에 필요한 제품을 생산하는데 많이 응용하고 있다. 현재 국내에서는 사용되고 있는 다양한 폭발접합제품을 전량수입에 의존하고 있는 실정이기 때문에 이를 국산화하기 위해서 폭발접합에 대한 기초적인 연구와 이의 응용에 대한 관심을 기울여야 할 것으로 사료된다.
$CO_2$ 용접의 스패터 발생에 미치는 용적이행 모드의 영향
강봉용,김희진 대한용접접합학회 1997 대한용접·접합학회지 Vol.15 No.2
The spatter generation rate of GMA welding with $CO_2$ gas shielding was measured with the change of welding conditions such as wire feeding rate and welding voltage and then the results were analized with the accompanying changes in metal transfer mode and in bead geometry. The spatter generation rate (SGR) was relatively low not only wit the short circuit transfer but with the truely globular transfer mode. However, the SGR resulted with the mixed mode were consistantly high. The resultant wave pattern of mixed mode was due to the coexistance of short-circuit and globular transfer and characterized by the frequent appearance of instantaneous short circuit. Considering the result of SGR and that of bead geometry, it could be concluded that when the wire feeding rate (or welding current) was either low or high, the optimum bead shape could be obtained along with the low spatter generation. However, in the middle range of wire feeding rate, the optimum bead shape was only obtained in the mixed mode condition resulting in the high spatter generation.
Review of magnetic pulse welding
강봉용 대한용접접합학회 2015 대한용접·접합학회지 Vol.33 No.1
Magnetic pulse welding(MPW) is a solid state welding process that is accomplished by a magnetic pulse causing a high-velocity impact on two materials, resulting in a true metallurgical bond. One of the great advantages of MPW is that it is suitable for joining dissimilar metals. No heat affected zones are created because of the negligible heating and the clean surfaces formation that is a consequence of the jet and the metal is not degraded. Also, compared to other general welding processes, this process leads to only a low formation of brittle intermetallic compounds However, although this process has many advantages its application to industrial fields has so far been very low. Therefore, in this study we are presenting the principles, apparatus and application of MPW for application the industrial fields.