风电塔架Q345E钢板焊接接头的组织与力学性能

Microstructure and Mechanical Properties of Q345E Weld Joints in Wind Power Tower

风电塔架作为风力发电机的重要支撑部件,其焊接接头性能对风机安全服役至关重要.针对该问题,采用金相、硬度、室温拉伸和断口分析等方法研究手工电弧焊和MAG焊工艺焊接风电塔架Q345E钢板的组织和力学性能.结果表明,不同焊接工艺下Q345E钢板焊接接头的组织与力学性能有明显差异,MAG焊的微观组织主要由较细小的先共析铁素体和珠光体构成,综合力学性能好;而手工电弧焊主要由较为粗大的块状铁素体和珠光体构成,且存在典型的铁素体魏氏组织,力学性能差.通过本研究证实MAG焊比手工电弧焊更适合于风电塔架的焊接.

As an important supporting component in wind turbines,wind power towers are essential for the safe service of wind turbines.For this problem,optical microsturcture,hardness,room temperature tensile and fracture analysis are used to study the microstructure and mechanical properties of Q345E steel plates for wind welding tower welded by shielded metal arc welding and MAG welding technologies,respectively.The results show that the microstructure and mechanical properties of Q345E steel welded joints under different welding technologies are significantly different.The microstructure of MAG welding is mainly composed of fine pro-eutectoid ferrite and pearlite,and exhibited good comprehensive mechanical properties.The shielded metal arc welding is mainly composed of coarser bulk ferrite and pearlite,with coexistence of typical ferrite Widmanstatten structure in the welded joint,and exhibiting poor mechanical properties.This study confirms that MAG welding is more suitable for the welding of wind power towers than shielded metal arc welding.