熔覆产生的蓝紫光与熔覆表面质量关系的研究

为了揭示熔覆时产生的蓝紫光信号与熔覆表面质量的关系,采用UV-420对熔覆产生的蓝紫光信号强度进行实时检测,取得了不同扫描速率与激光功率条件下,蓝紫光信号的强度值。经实验研究与理论分析可得,蓝紫光强度相对稳定在1.7μW/cm2～2.5μW/cm2时,熔覆表面质量相对比较好;同时证明了熔覆时的等离子体主要来源于熔覆粉末的气化击穿。结果表明,蓝紫光信号强度的大小,在一定程度上能够反映熔覆表面质量的好坏,且能够为熔覆的闭环反馈控制提供具有参考价值的相关参量。

Effect of blue-violet light on quality of cladding surfaces

In order to reveal the relationship between blue-violet light signal and the surface quality in cladding process,the blue-violet light signal intensity was measured in real time with a UV-420 device.The blue-violet intensity was obtained at different scanning speeds and laser power.Experimental and analytical results show that the surface quality is good when blue-violet intensity is relatively stabled at 1.7μW/cm2～2.5μW/cm.And the plasma is mainly caused by the breakdown of powder's vaporization.The blue-violet intensity can reflect the surface quality,and it can also provide parameters for closed-loop feedback control.