Study on Cooling Characteristic Improvement in Underwater Wet Arc Welding of TMCP Steelplate

J. Ocean Eng. Technol. 1992;6(2):113-124.

TMCP강의 습식수중 아크용접부의 냉각특성 개선에 관한 연구

김민남

부산공학대학

Keywords: Underwater Wet Welding, Cooling Rate, Thermal Cycle, Underwater Shield Welding, Maximum Hardness, Heat Affected Zone

핵심용어: 습식 수중 용접, 냉각속도, 열 사이클, 실드 수중용접, 최고 경도, 열영향부

Abstract

The offshore industry created a need for quality wet weld repairs. Wet welding is a fast method of repair providing sound, structural quality welds. It requires less support equipment than a similar underwater dry weld repair or the alternative mechanical connections. Compared to welds made in air, underwater wet welds are plagued by increased hardness due to rapid quenching by the surrounding water. In this paper is described the experimntal study of improving the cooling rates of wet welds of TMCP steel plate by shielding around weld arc surroundings. The principal results of this experimental investigation can be summarized as follows : By shielding around weld arc surrounding, the cooling rates resulting from wet welds on TMCP steel plate could be lower than that of nonshielded wet welds and the fesibility on high quality of mecanical properties of wet weld on TMCP steel plate was carried out with shielded weld arc surrounding.