论文部分内容阅读
In this paper, non-linear welding temperature fields are analyzed by finite element method. A mathematical model is proposed to calculate the temperature fields of local drying underwater welding. As an example, the temperature field of local drying underwater welding for 6 mm thick steel sheet is calculated. A comparison is made among the effects of various welding conditions on cooling characteristics in fusion zone. The cooling speed from 800 ℃ to 500 ℃ can be decreased with the increase of shield radius, the coordination of low heat input with low welding speed or the reduction of heat conduction at the bottom, thus improving the quality of welding joints. It has been shown that the finite element method, as a useful tool for analysing heat transfer of underwater welding under various conditions, can be employed to provide a basis for the analysis of material’s underwater weldability, the design of proper underwater welding equipment and the rational selection of welding parameters.
In this paper, non-linear welding temperature fields are analyzed by finite element method. A mathematical model is proposed to calculate the temperature fields of local drying underwater welding. As an example, the temperature field of local drying underwater welding for 6 mm thick steel A comparison is made among the effects of various welding conditions on cooling characteristics in fusion zone. The cooling speed from 800 ° C to 500 ° C can be decreased with the increase of shield radius, the coordination of low heat input with low welding speed or the reduction of heat of at the bottom, thus improving the quality of welding joints. has has shown that the finite element method, as a useful tool for analyzing heat transfer of underwater welding under various conditions, can be employed to provide a basis for the analysis of material’s underwater weldability, the design of proper underwater welding equipment and the rational selection of welding parame ters.