SA-335P91药芯焊丝气体保护焊工艺试验

摘要

药芯焊丝气体保护焊是一种优质、高效的焊接工艺方法,锅炉行业已于21世纪初在碳钢、SA-335P12和12Cr1MoVG等材质的集箱承压焊缝上推广使用,焊材已实现国产化.然而,对于SA-335P91材质来说,由于药芯焊丝的研制难度较大,工艺性能和力学性能难以同时满足要求,综合研发成本较高,只有少数的国外大型焊材供应商对此配方进行了研发,国内尚无对应的焊材.选择多家国外著名焊材供应商的SA-335P91药芯焊丝进行对比试验分析.从焊接规范和热处理规范等参数对SA-335P91药芯焊丝接头性能的影响方面进行了试验研究,分析其影响规律,获得了最合理的焊接及热处理参数范围;观察分析焊缝的宏观和微观组织,并提出进一步的改进建议.%Flux-cored wire gas shielded welding is a high quality and efficient welding method,which is widely applied to the pressure-bearing welds on the header made of carbon steel,SA-335P 12 and 12Cr1MoVG in boiler industry in the beginning of 21 st century.And the nationalization of these flux-cored wires has been realized.However,for SA-335P91 material,because the development of flux-cored wire is difficult,the requirements of procedure performance and mechanical property can not be met simultaneously,and R&D cost is high,only a few foreign renowned welding material suppliers research and develop the formula of the flux-cored wire and there are no corresponding welding materials in China now.Therefore,the flux-cored wires for SA-335P91 made by several famous welding material suppliers are tested,compared and analyzed to study the influence of welding parameters and heat treatment parameters on the properties of SA-335P91 flux-cored wire joint,thus the influence rules are analyzed and the most reasonable range of welding and heat treatment parameters is obtained.Besides,the macrostructure and microstructure of the welds are observed and analyzed,and further recommendations for improvement are put forward.