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为改善TC4钛合金激光焊接质量,引进超声振动场辅助激光焊接工艺,即超声跨态处理(UPPLW),通过改变超声场强度,采用三圆截点法研究超声功率对激光焊接接头微观组织的影响,利用可靠性理论对数据进行分析。结果表明,在外加辅助超声场作用下,随着超声功率的增加,焊缝组织晶粒有逐渐细化的趋势,当超声功率为1600 W时,试样焊缝组织的晶粒度较常规方法获得的细化了15.8%。最后分析了超声跨态处理工艺细化组织晶粒的机理。
In order to improve the laser welding quality of TC4 titanium alloy, ultrasonic vibration field assisted laser welding process (UPPLW) was introduced to study the effect of ultrasonic power on the microstructure of laser welded joints by changing the ultrasonic field strength , Using the reliability theory to analyze the data. The results show that with the increase of ultrasonic power, the grain size of the weld seam tends to be refined gradually with the aid of the ultrasonic field. When the ultrasonic power is 1600 W, the grain size of the weld seam is smaller than the conventional method Obtained refinement of 15.8%. Finally, the mechanism of fine grain refinement by ultrasonic cross-processing was analyzed.