轧辊埋弧堆焊过程多场耦合数值模拟方法研究

埋弧堆焊是冶金行业轧辊修复的重要方法,目前多是对轧辊埋弧堆焊过程中温度场或应力场的单一场进行研究,而埋弧堆焊流场的研究极少。堆焊中的电磁力、温度梯度与熔池内流动密切相关,基于热-弹-塑性理论和流体动力学计算方法(CFD),建立轧辊堆焊过程热-弹-塑-流多场耦合模型,获取堆焊过程温度场、应力场和流场的演变规律,分析表面张力、电磁力、浮力对堆焊熔池流动状态及形貌的影响规律,同时对堆焊工艺进行材料学表征分析。研究成果对预测埋弧堆焊过程多物理场的变化规律、熔池流场演变机理和有效预防堆焊开裂具有一定的实践意义。

Multi Field Coupling Numerical Simulation of Roll Submerged Arc Surfacing Process

Submerged arc surfacing is an important method for roll repair in metallurgical industry. The single field of temperature field or stress field in the process of submerged arc welding of roller has been studied, but few researches on submerged arc welding flow field are carried out. The electromagnetic force and temperature gradient are closely related to the flow in the weld pool. Therefore, based on the thermo elastic plastic theory and CFD method, a thermo elastic plastic fluid multi field coupling model of roll surfacing process is established. The evolution laws of temperature field, stress field and flow field were obtained. The influence of surface tension, electromagnetic force and buoyancy on the flow state and morphology of weld pool was analyzed. At the same time, the surfacing process was analyzed by material characterization. This research has a certain practical significance to predict the change law of multi physical field, the evolution mechanism of molten pool flow field, and effectively prevent surfacing cracking.