机械振动焊接对焊缝及热影响区金相组织的影响

主要研究了机械振动（振动频率在330－166Hz）焊接后的焊接及热影响区的金相组织形态。试验采用容器常用钢16MnR，采用埋弧自动焊，同时对其施加机械振动。选取三组试样分别在不同振动频率和振幅的条件下，进行振动焊接。结果表明，机械振动焊接可大大改善焊缝及热区的金相组织，使焊缝的组织明显细化，熔合线和过热区变窄，魏氏组织减少。同时，从焊缝溶池结晶过程方面，对在该条件下焊缝及热影响区的金相组织的形成过程做了详细的讨论。另外还得出，振动频率在窄范围内对振动焊接试件的焊缝及热影响的金相组织无明显影响。振动振幅对振动焊接试件的焊缝及热影响区的金相组织影响较大。

The Effect of Mechanical Vibration Welding on the Microstructure of Weld and HAZ

The article mainly discussed the microstructure''s state of weld and HAZ by mechanical vibration(frequency of vibration is among 33166Hz)welding process.The 16MnR steel commonly used in vessel was used in the experiment.It was welded by SAW while it was being vibrated mechanically in low frequency.Three samples weres separately welded in various frequency and amplitude of vibration.The results show that the mechanical vibration welding can largely improve the microstructure of weld and HAZ,the size of grain of weld was obviously refined,the weld line and over heated zone were narrowed,and the dimension of widmanstatten structure in HAZ was greatly decreased.Meanwhile,the forming process of weld and HAZ in the current situation was discussed in detail from the point of view of weld pool solidifying process and temperature field.It was also included that the frequency of vibration had not effective effect on the microstructure of weld and HAZ in narrow scope.The mechanical vibration welding had larger effect on the microstructure of weld and HAZ.