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利用CCD摄像机以及红外光辐射信号监测系统系统地研究了钛合金TC4激光焊接过程中红外光辐射信号的特征以及焊接线能量与熔池红外光辐射信号熔池面积的关系。研究表明,(1)对应整条焊缝,红外光辐射信号可明显分为3个阶段,分别对应焊接起始阶段、准稳态阶段及焊接收弧阶段(;2)当线能量增加(功率不变焊接速度降低)时,熔池面积变大,红外光辐射信号相对强度随之增强;(3)熔池面积与红外光辐射信号相对强度之间存在相同的变化规律,因此利用红外光辐射信号可以相当准确地监测焊接过程的熔池面积变化,进而监测焊接过程的稳定性。
The characteristics of the infrared radiation signals during the TC4 laser welding of titanium alloy and the relationship between the welding line energy and the bath area of the infrared light radiation signal in the molten pool were systematically studied by CCD camera and infrared radiation signal monitoring system. The results show that: (1) Corresponding to the whole weld, the infrared radiation signal can be obviously divided into three stages, corresponding to the welding initial stage, quasi-steady state stage and welding arc-closing stage Constant welding speed decreases), the pool area becomes larger, the relative intensity of the infrared light radiation signal increases; (3) There is the same variation rule between the relative intensity of the molten pool area and the infrared light radiation signal. Therefore, The signal can fairly accurately monitor weld pool area changes during welding and thus monitor the stability of the welding process.