抄録
A welded joint is widely used for bonding structural members and machine parts as well as bolted and riveted joints. When some defects or cracks are detected by visual or non destructive inspections aroud welded regions, a so-called “repair welding” is conducted to compensate the strength of welded structure. Since the weld length by repair welding is generally short, the welded portion is likely to undergo a rapid cooling, thus leading to the reduction of joint strength.
In this paper, a numerical approach using three-dimensional Finite Difference Method (FDM) in the transient temperature field is proposed for evaluating the fundamental characteristics of cooling process of repair welding. The shielded metal arc welding is performed to verify the validity of the proposed numerical method, and the numerical results of temperature distributions on plate surface are also compared with those obtained by infrared thermography.
