Q690E与Q345E异种钢焊接力学性能的研究

Mechanical Property of Dissimilar Steels Welding Between Q690E and Q345E Steel

针对在臂架结构中主弦管（Q690E）~支管（Q345E）焊接问题，在相关规范的基础上，选择焊条手工电弧焊fSMAW）和药芯焊丝CO：气体保护焊（FCAW）~种焊接方法，焊接材料：焊条选择CHE58-1@3．2／b4．0mm），药芯焊丝选择Supercored71H（~b1．4rainl，采用斜Y坡H形式，进行必要的焊接前处理、焊接预热和焊接后热。对Q690E与Q345E异种钢焊接接头进行了拉伸、弯曲、冲击和硬度试验。结果表明：采用两种焊接方法焊接Q690E与Q345E，可以获得拉伸、弯曲和冲击性能良好的焊接接头，焊缝区域硬度比较均匀，焊接接头硬度在170~300HV之间。确定焊接工艺的可行性．并指导了臂架的现场焊接制造。

In order to solve the problem of dissimilar steel welding between string tube （Q690E） and branch （Q345E） in the structure of boom, the SMAW and FCAW were established. The welding materials （CHE58-1 and Supercored 71H） were confirmed. The geometry Y of the groove was chosen. Treatrnelat before welding, welding preheating and heat treatment after welding were done according to relevant welding criteria. The tensile test, bend test, impact test and hardness test were made to dissimilar steel welding between Q690E and Q345E. The results show that using two kinds of welding methods for welding Q690E and Q345E, the stretching, bending and impact properties of the welded joints are good. The hardness of the weld zone is uniform, the hardness of the weld is 170-300 HV. The feasibility of welding process was determined and the welding manufacture of the boom was directed.