金属加工（热加工）Issue(10)：45-54,10.
热输入对地铁转向架典型结构温度场的影响
Influence of heat input on temperature field of typical structure of subway bogie
摘要
Abstract
P355NL1 steel has good plasticity,toughness and weldability,and is an ideal material for subway bogies.For medium and heavy plate structural parts such as bogies,MAG multi-layer welding is generally used for connection.This welding method has the characteristics of large heat input,high energy utilization,low cost and few porosity defects.However,the change of heat input affects the change of grain and temperature field of multilayer weld structure,and because the complex thermal cycling process is difficult to observe by experimental means,numerical simulation of temperature field is an important means to explore the thermal process.In this paper,the welding test and temperature field simulation research are carried out for the MAG multi-layer welding of typical T-shaped structure of P355NL1 steel rail vehicle bogie.The analysis shows that the bottom weld has undergone multiple thermal cycles,and the welding of the rear weld will have the effect of heat treatment on the front weld,so that the rear weld has a fine grain effect on the heat-affected zone of the front layer,and it is found that with the increase of welding current and the decrease of welding speed,the weld melting width and penetration depth will increase accordingly.关键词
MAG多层焊/有限元仿真/P355NL1钢/热输入/温度场Key words
MAG multi-layer welding/finite element simulation/P355NL1 steel/thermal input/temperature field引用本文复制引用
尤君,黄志鹏,黄舒文,王建峰..热输入对地铁转向架典型结构温度场的影响[J].金属加工（热加工）,2025,(10):45-54,10.基金项目
江苏省自然科学基金(BK20220900). （BK20220900）
