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570MPa급 용접구조용강 다층 용접금속의 강도 및 충격인성에 미치는 입열 및 패스간 온도의 영향
변지철,방국수,장웅성,박철규,정우현,Byun, Ji-Chul,Bang, Kook-Soo,Chang, Woong-Sung,Park, Chul-Gyu,Chung, Woo-Hyun 대한용접접합학회 2006 대한용접·접합학회지 Vol.24 No.1
570MPa grade weldable steels were gas metal arc welded with various heat inputs and interpass temperatures using flux cored wires. Effects of heat input and interpass temperature on the strength and impact toughness of weld metal were investigated in terms of microstructural change, recovery of alloying elements, and the amount of reheated weld metal. Increase of heat input and interpass temperature resulted in decrease of weld metal strength. This is because of the small amount of acicular ferrite, large columnar size and low recovery of alloying elements such as manganese and silicon. In addition to the microstructural change, weld metal toughness was also influenced by the deposition sequence. It increased with an increase of the amount of reheated weld metal.
이정수,윤진오,정상훈,박철규,안영호,Lee, Jeong-Soo,Yun, Jin-Oh,Jeong, Sang-Hoon,Park, Chul-Gyu,An, Young-Ho 대한용접접합학회 2010 대한용접·접합학회지 Vol.28 No.2
In this study, newly developed welding consumables for EGW were welded in EH 36 TM steel plates and their welded joints were evaluated in point of mechanical properties and microstructures compared with imported consumables. Newly developed welding consumables were evaluated as good arc stability and slag fluidity, substantially the same with imported products. The tensile strength of all welded joints were sufficient to meet the requirements specified in a ship’s classification(490~640MPa) and all areas of fracture were heat affected zone(HAZ). Charpy absorbed energy values of all EG welded metals were sufficient to meet the requirements of classification(min. 34J) and those of newly developed wires were evaluated to be better than those of imported wires. As a result observing microstructures of single and tandem EG welded metals through optical and scanning electron microscope (OM&SEM), no grain boundary ferrite(PF(G)) were created in a prior austenite grain boundary and a volume fraction of a fine acicular ferrite were observed very high.
김태훈(Tae-Hoon Kim),박철규(Chul-Gyu Park) 대한용접·접합학회 2017 대한용접·접합학회지 Vol.35 No.6
Welding consumables for arc welding are widely used in various industrial fields. Amongst all processes, the GMAW and FCAW can especially be seen as core processes as they cover approximately 80% in terms of usage. In regards to the FCAW, countless studies are done focusing on the diffusible hydrogen, resulting in developments such as seamless FCW in order to reduce the diffusible hydrogen and the development of welding torch devices that input hydrogen within the shielding gases. Furthermore, countless developments are being made for consumables in the field of construction related fabrications due to the plethora of steel types available and the trend of automation. Developments are also being made according to the automotive industry for the welding of high strength steels and zinc-primered steels.
800 MPa급 무예열 용접재료의 폭파변형성능에 관한 연구
박태원,송영범,김진영,박철규,김희진,Park, Tae-Won,Song, Young-Beum,Kim, Jin-Young,Park, Chul-Gyu,Kim, Hee-Jin 대한용접접합학회 2009 대한용접·접합학회지 Vol.27 No.6
The Cu-bearing PFS-700 steel which has yield strength over 700 MPa was developed to replace the existing submarine structural material, HY-100. The PFS-700 steel has a combination of good mechanical properties and superior weldability. Becaus of that, it can be welded without pre-heating. The application of PFS-700 steel to submarine or battle ship will give a great reduction of cost by omitting pre-heating or lowering pre-heat temperature. To develop pre-heating free welding consumables that match and take advantage of PFS-700 steel, new welding consumables have been designed for the GMAW, SAW processes and explosion bulge test(EBT) was conducted to see the reliability of welded structure. All welds were made without pre-heating, and the inter-pass temperature was below $50^{\circ}C$ for SAW50 and $150^{\circ}C$ for GMAW and SAW150. All EBT specimens show over 14% thickness reduction without through-thickness crack or crack propagation to the hole-down area. Tensile properties for all welding conditions show higher(GMAW) or similar values(SAW50, SAW150) to the base metal. Charpy impact values for the weld metal also show 163.5J(GMAW), 95.4J(SAW50) and 69.0J(SAW150), which meet the goal(higher than 50J) of this project.
FCAW에서 용접변수에 따른 용접금속 강도 및 와이어 합금원소의 회수율 변화
정동희,방국수,박찬,장웅성,박철규,Jung, Dong-Hee,Bang, Kook-Soo,Park, Chan,Chang, Woong-Sung,Park, Chul-Gyu 대한용접접합학회 2008 대한용접·접합학회지 Vol.26 No.2
590MPa grade weldable steels were gas metal arc welded with flux cored wires. Welding parameters such as current, voltage, and speed were varied independently. Effects of each parameter on the strength and chemical composition of weld metal were investigated. Increase of voltage caused decrease of weld metal tensile strength due to the low recovery of alloying elements such as carbon and manganese. On the contrary, increase of current and speed resulted in increase of weld metal strength because of higher recovery of the alloying elements.
박태원,송영범,김진영,양성호,박철규,서준석,김희진,Park, Tae-Won,Song, Young-Beum,Kim, Jin-Young,Yang, Sung-Ho,Park, Chul-Gyu,Seo, Jun-Suck,Kim, Hee-Jin 대한용접접합학회 2010 대한용접·접합학회지 Vol.28 No.6
The pre-heat free consumables for GMAW, SAW and FCAW processes that matche with the Cu-bearing PFS-700 steel which has yield strength over 700MPa were developed and evaluated to see the suitability in military such as submarine and battle ship. Explosion Bulge Test underwater was developed and applied to see the reliability of welded structure. All welding was conducted without pre-heat before welding, the interpass temperature was below $150^{\circ}C$ for all welding conditions. Tensile strength for the weld metal in GMAW, SAW and FCAW process is 887MPa, 875MPa and 813MPa, respectively, these values are similar to the base metal of PFS-700 steel of 838MPa. EBT results in GMAW, SAW and FCAW show 14.0%, 14.02% and 15.9% reduction of thickness without generation of crack, respectively and stand-off distance was set up properly to have over 14.0% reduction of thickness. Through EBT results, the developed new consumables are applicable to the weapon systems such as submarine and battle ship.
열간단조 금형 육성용접부 내균열성 및 내열충격성 평가방법에 관한 연구
조상명,김성호,정연호,백승희,장종훈,박철규,우희철,정병호,Cho, Sang-Myung,Kim, Sung-Ho,Jung, Yun-Ho,Baek, Seung-Hui,Jang, Jong-Hun,Park, Chul-Gyu,Woo, Hee-Chul,Jung, Byong-Ho 대한용접접합학회 2010 대한용접·접합학회지 Vol.28 No.3
Hardfacing is one of the frequently applying method to increase surface hardness in hot forging die. Recently, hardfacing receives great attention due to it's repair availability and low cost. In hot forging die, crack resistance and thermal shock resistance have been considered as major properties, However there are few studies for the assessment of these properties. So, it is necessary to establish the assessment method for crack resistance and thermal shock resistance in hardfacing for hot forging die. In this study, flux cored arc welding was applied to make hardfacing welds. Three point bending test was carried out to assess hardfacing weld's crack resistance, and high temperature bending test using salt bath was developed for thermal shock resistance. Consequently, it was possible to assess crack resistance and thermal shock resistance of hardfacing welds for hot forging die quantitatively.