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电动车组的运行经验证明,转向架构架在振动和冲击负荷的作用下,可能产生疲劳裂纹。通常,疲劳裂纹出现和分布在焊缝周围区域内,因为该处应力高度集中。为了减少这些应力和提高转向架的疲劳强度,苏联里加车辆制造工厂一直是用砂轮磨光焊缝周围区域的,但是这种作业有许多缺点:劳动生产率低,支架附近不能加工,对健康有害,磨光后焊角不能测量等。因此,该厂采用了在氩气中用钨极电弧处理(熔化)焊缝周界。这种方法提高了转向架构架的疲劳强度,并可能处理整个空间位置内和施工困难处的焊缝周围区域,焊工也比较容易掌握操作。在由成批生产设备组成的焊接间(见
The operation experience of EMUs has proved that the bogie frame may cause fatigue cracks under the action of vibration and impact load. Frequently, fatigue cracks appear and distribute in the area around the weld as the stresses are highly concentrated there. In order to reduce these stresses and increase the fatigue strength of the bogies, the vehicle manufacturing plant in Riga, the Soviet Union, has been grinding the area around the weld with a grinding wheel. However, this operation has many drawbacks: low labor productivity, unworkability near the support, health hazards, Polished welding angle can not be measured. As a result, the plant used a tungsten arc to process (melt) the perimeter of the weld in argon gas. This method increases the fatigue strength of the bogie frame and can handle areas around the weld within the entire spatial location and at construction difficulties, and the welder is also relatively easy to master. In the welding of batch production equipment (see