利用振动时效技术消除链条抽油机机架焊接残余应力

Application of VSR in removing the residual welding stress in chain-drive pumping unit frame

在链条抽油机机架制造过程中 ,为减少机架焊接变形 ,消除机架焊接完成后的残余应力 ,保证机架的尺寸的稳定性 ,在制定合理的焊接工艺的同时 ,采用了振动时效的工艺措施。文章详尽阐述了抽油机机架焊接残余应力的产生及分布情况 ,利用振动时效消除残余应力的基本机理和具体实施方案。通过对抽油机机架在进行振动时效处理前后的残余应力测试数据的分析、对比 ,表明机架在振动时效处理后应力处于均匀化趋势 ,其平均应力和峰值应力普遍降低 ,从而大大减少了机架随时间延伸而发生变形的倾向 ,提高了机架尺寸精度的保持性。

In the course of building the chain-drive pumping unit frame,to reduce welding deformation and remove residual stress,a reasonable welding process and the vibrational stress removal technology are used.The paper thoroughly expatiate on the generation and distribution situation of residual welding stress and the basic principle and concrete implement scheme in applying vibration stress removal to remove residual welding stress.The stress uniform tendency is indicated by the stress testing data analysis and comparison in front and behind the frame being treated by vibrational stress removal.Its mean and peak stress are reduced in general.Thus the frame deformation is decreased greatly as time goes on,and the holding of the size accuracy is increased.