TC4钛合金光纤激光焊接熔池尺寸与近红外光信号之间的关系

Relationship Between Molten Pool Size and Near-infrared Light Signal During Fiber Laser Welding of TC4 Titanium Alloy

利用光信号实时监测系统对TC4钛合金光纤激光焊接熔池近红外光信号进行监测,探讨了熔池尺寸与近红外光信号之间的关系。试验结果表明,近红外光信号强度与熔池表面尺寸之间存在线性关系,在穿透型与非穿透型小孔条件下,二者之间的线性关系式不同;近红外光信号强度与熔深之间存在较为明显的二次曲线关系。

Optical signal real-time monitoring system was utilized to monitor the molten pool near-infra- red light signal during fiber laser welding of TC4 titanium alloy, analyzed the relationship between molten pool size and near infrared signal. It was showed that there is a lin- ear relationship between near-infrared light signal strength and surface size of molten pool, under the condition of penetration type and non penetrating holes, the linear re- lation between them is different; and there is a relatively obvious quadratic curve relationship between near-infrared light signal strength and penetration.