摘要
采用电阻焊焊接超低碳钢显像管支架会出现显示器图象失真、信号滞后等问题。实验证明这种现象可以采用焊后热处理的方式得以解决 ,但是这会提高能量的消耗和增加生产时间。而改用激光束来焊接来对显示器支架进行焊接 ,在不需要焊后热处理的情况下就能获得良好的显示效果。电阻焊焊接导致显示效果不佳的主要原因是由于其焊接后焊缝接头的微观组织畸变太大 ,致使焊缝处的矫顽力Hc 和剩磁强度Mr 大大提高 ,不利于从新磁化。但是采用激光焊接的焊缝微观组织畸变相对来说小得多 ,而且焊缝晶粒贴近于原始母材 ,所以对Hc 和Mr的影响很小。因此 ,激光焊接的显像管支架不经焊后热处理也不会导致图象失真。
The super-low carbon kinescope bracket welded by resistance welding is easy to cause the image distraction and signal lagging. Experiments show that this phenomenon can be overcome by welding post heat treatment, but it highly cost for both energy and time. Laser welding is successfully used to weld the kinescope bracket,and received well display result without welding post heat treatment. The main reason for resistance welding to result in the image distortion is that the microstructure of the welding joint of kinescope bracket has been changed greatly, which will cause the increasing of the coercive force and remained magnetic field strength. But we found that the distortion of the laser welding joint microstructure is relatively much smaller, and because the weld grain presses close to the base metal, it has little effect on the coercive force and remained magnetic field strength. In this situation, the welding post heat treatment can be abolished, which will not affect the image distortion apparently.
出处
《焊接》
2004年第11期25-28,共4页
Welding & Joining
