Analysis for Cooling Process of Underwater Welding

—Characteristics of Heat Transfer on Plate Surface and Temperature Distributions—

Abstract

Underwater welding techniques are recently used for the repair and maintenance of offshore structures. There are two types of underwater welding techniques such as“dry”and“wet”. They are identified in accordance with the existence of water in the welding environment.
Although dry welding seems to be more frequently used in practical applications, wet welding is simple and less expensive, and so it is more appropriate especially for the emergency repair. In this paper, mixed gas shield welding is executed to estimate fundamental characteristics of wet welding. Coefficients of heat transfer are used to evaluate how much heat energy is transferred from the plate surface to surrounding water. In addition, three dimensional FDM is applied to numerically analyze temperature distributions within the plate, where coefficients obtained above are incorporated.