Proceedings of the KWS Conference (대한용접접합학회:학술대회논문집)

The Korean Welding and Joining Society (대한용접접합학회)
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The Underwater Wet Welding Characteristics of SWS490 Steel

SWS490강의 습식수중용접특성

  • Park, Gi-Yong (Hankuk Aviation University, Materials Engineering Department) ;
  • Lee, Sang-Yul (Hankuk Aviation University, Materials Engineering Department) ;
  • Lee, Byung-Hoon (Korea Institute of Machinery and Metals)
  • Published : 1997.10.01
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Abstract

The characteristics of underwater welding of SWS490 steel were investigated. The bead-on-plate type welding with one or three pass using ilmenite and water-proofed type electrodes was performed by varying welding currents and the sizes of electrodes used. The amounts of hydrogen absorbed inter the weld metal were measured according to the JIS Z 3118 specification and the results were interpreted in terms of the cold cracking behaviours of the welded steel. The microstructural changes as well as the microhardness distribution after underwater welding were also investigated using Vickers microhardness tester and S.E.M (scanning electron microscopy) and O.M (optical microscopy). The results indicated that the cold cracking could be avoided by three pass welding under low current with an electrode with a small diameter.

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