CO2激光焊接TA15熔池红外光辐射信号与焊接参数的关系

Relation between relative intensities of infrared radiation and welding parameter during CO2 laser welding of TA15

关键词:  激光焊接  钛合金  红外光辐射信号  熔宽

Key words:  laser welding  Ti-alloy  infrared radiation  weld pool width

摘要:

以TA15钛合金为研究对象,采用自行研制的红外光辐射信号监测系统,研究了在激光焊接过程中红外光辐射信号的特征以及焊接热输入与熔池红外光辐射信号和焊缝熔宽的关系.结果表明,对于整条焊缝红外光辐射信号可明显分为三个阶段,分别对应焊接起始阶段、准稳态阶段和焊接收弧阶段;当热输入增加(功率不变焊接速度降低)时,焊缝熔宽变大,红外光辐射信号相对强度随之增强,熔宽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的变化,进而监测焊接过程的稳定性.

Abstract:

The infrared radiation monitoring system is systematically used in the present study to investigate the characteristics of infrared radiation,influences of the heat input on the relative intensities of the infrared radiation and the weld shaping during laser welding of TA15.It is found that the relative intensities of the signal can be obviously divided into three phases for the whole weld seam:the starting state of welding,the quasi-stable state,and the arc suppressing of welding.When the heat input increases(laser power keeps constant with welding speed decreasing),the weld pool width increases,and the relative intensity of infrared radiation signal increases accordingly.Such findings indicate that molten pool and relative intensities of infrared radiation share the same rules of variation.These changes on the area of molten pool can be monitored exactly,which reflect the stability of welding process by observing the infrared radiation signal.