基于GMAW堆焊成形的堆焊层焊道搭接量及力学性能研究

Research on Weld Overlap and Mechanical Properties of Surfacing Layers Based on GMAW Surfacing Forming

以基于GMAW堆焊成形的堆焊层为研究对象,研究了其焊道搭接量模型,重点分析了焊道搭接量对堆焊层成形表面平整度的影响。通过试验对搭接模型的可靠性进行了验证,并对堆焊层横截面整体显微硬度进行测试,对堆焊层水平方向的力学性能进行了拉伸试验。结果表明:采用电流115 A、送丝速度50 mm/s、焊接速度6 mm/s这组成形工艺参数时,成形质量相对稳定,堆焊层成形表面平整度好;堆焊层的硬度从焊道底部向上逐渐增大,大致在150~180HV之间;堆焊层拉伸性能好,断口为韧性断裂,塑形好,能满足零件的使用性能要求。

Taking GMAW surfacing forming as the research object, the weld overlap model was established, and the influence of the weld overlap on the surfacing forming surface＇s smooth degree was analyzed. The reliability of overlap model was validated through test. The microhardness of cross section of surfacing layer and the mechanical properties in horizontal direction of surfacing layer were tested. The results show that when the current is 115 A, wire feeding speed is 50 mm / s and welding speed is 6 mm/s, the forming quality is relatively stable, and the smooth degree of surfacing layer forming is good. The surfacing layer＇s microhardness increases from bottom to top of the bead, which is about between 150-180HV. The tensile properties of surfacing layer are good, the fracture is ductile fracture, and its plasticity is good. It can meet the performance requirements of parts.