将超细颗粒焊剂约束电弧超窄间隙焊接用于1Cr18Ni9Ti奥氏体不锈钢,通过改变焊接速度、电弧电压、焊接电流对焊缝成形进行了研究.结果表明,在热输入为1.75 k J/mm和深宽比为1.34的条件下,也不易形成'梨形'焊道裂纹,并且单道焊接时熔化焊丝在超窄间隙内的填充高度可达11.5 mm.在其它焊接参数确定的情况下,随着电弧电压的增加,1Cr18Ni9Ti奥氏体不锈钢超窄间隙焊缝依次呈'凸焊缝'、'凹焊缝'及'电弧攀升'的成形规律.适合于超细颗粒焊剂约束电弧超窄间隙焊接1Cr18Ni9Ti奥氏体不锈钢的电弧电压与焊接电流匹配范围分别约为26~32 V和200~320 A.
Ultra-narrow gap welding （UNGW） process with high stabilization, reliability and without spatter can be achieved with constricted arc by molten slag wall, which is made from melted flux. The experiments are carried out by changing voltage under different currents. The results indicate voltage range being fit for UNGW is about 22 -31 V under the current range of 200 -320 A. With the increasing of voltage, weld formation of UNGW has the law of lack of fusion on sidewall, good weld and undercut in turn under a certain current. In addition, the action relationships among arc, molten slag wall and sidewalls can be improved by properly adjusting voltage and current of arc, which makes cathode spot properly distribute in ultra-narrow gap. Therefore, the effective control of weld formation of UNGW has been achieved.
