Abstract：Research purposes:According to the structural characteristics of the arch rib of the steel tube of polygonal line(arc shape) ，this paper tries to find out the negative factors which affect the welding position，speed changes and structural mass balance when joining the segment of arch rib into the polygonal line (Arc shape) during automatic submerged － arc welding，and offers the solution to the problem with kinematic analysis and calculation for making the processing of arch rib of steel tube in workshop fulfilled by submerged － arc welding．
Research conclusions:Based on the theoretical analysis and according to the actual production process，the negative factors were overcome by determining the reasonable support location of roller and properly configuring weight equalizer．Based on it，a method to do girth welding of polygonal line tube with submerged－arc welding was found．With this method，the 100% of automatic welding of girth joint in factory workshop can be realized，which is up to 90% of the full－bridge tube girth joint with features of less welding defects，stable welding quality and improving welding efficiency．
2011, Vol. 28 
版权所有 © 2014 《铁道工程学报》编辑部