The effect of welded joint properties on the surface characteristics of laser-welded 2205 duplex stainless steel
The effect of welded joint properties on the surface characteristics of laser-welded 2205 duplex stainless steel
复制标题
焊接接头性能对激光焊接2205双相不锈钢表面特征的影响
DOI：
10.1177/1687814018797449
复制
发表时间：
2018-09-12
影响因子：
2.1
通讯作者：
Tang, Hongqun
中科院分区：
文献类型：
--
作者：
Hu, Shanshan;Zheng, Dongrui;Tang, Hongqun
焊接表面质量差的焊接接头对应力集中很敏感，影响工件的抗拉强度以及压力容器和液体容器中液体和气体的流动性。采用正交试验方法，研究了不同电流、脉冲宽度和频率对1 mm厚双相不锈钢板激光焊接接头表面特性的影响。根据观察到的焊接表面质量，对焊接接头性能进行了快速判断。结果表明，均匀的相比例和晶粒细化并不能保证良好的焊接表面质量。以较小的点间距或点间距差、较小的焊缝宽度、减小的表面粗糙度和表面波纹谷深为特征的令人满意的焊接表面质量意味着更好的焊接接头机械特性和更均匀的显微组织。在最佳焊接工艺参数和最大热输入条件下，试样的铁素体相体积分数最低，为42.5%，抗拉强度最高，为848 MPa，其表面质量最好。
Welded joints of poor welding surface quality are sensitive to stress concentrations, affecting both the tensile strength of workpieces and the fluidity of liquids and gases in pressure and liquid containers. Orthogonal experiments involving the laser welding of 1-mm-thick duplex stainless steel sheets were conducted using different electric current, pulse width and frequency values in order to analyse the effect of welding properties on the surface characteristics of the welded joints. Rapid judgement regarding the welded joint properties was made based on the observed welding surface quality. The results show that an even phase proportion and grain refinement are not necessarily guaranteed to provide good welding surface quality. A satisfactory welding surface quality characterised by a smaller spot pitch or spot pitch difference, smaller weld width, reduced surface roughness and valley depth of surface waviness implies better welded joint mechanical characteristics and a more even microstructure. The specimen with the most suitable welding parameters and the greatest heat input can reach the lowest volume fraction of ferrite phase of 42.5% and the highest tensile strength of 848 MPa, and its surface quality is the best.