800 MPa급 무예열 용접재료의 폭파변형성능에 관한 연구 (Investigation on Explosion Bulge Test Results of 800 MPa Grade Pre-heat Free Welding Consumables)

서지정보

· 발행기관 : 대한용접접합학회
· 수록지 정보 : 대한용접접합학회지 / 27권 / 6호 / 80 ~ 86페이지
· 저자명 : 박태원, 송영범, 김진영, 박철규, 김희진

초록

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℃ for SAW50 and 150℃ 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.

영어초록

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℃ for SAW50 and 150℃ 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.

참고자료

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