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利用高功率脉冲固体Nd:YAG激光对4mm厚的5A06铝合金板材进行切割试验,探讨辅助气体Ar、N2、O2对激光切割质量的影响。通过光学显微镜、扫描电子显微镜、粗糙度测量仪、X射线衍射仪分析切缝及切面的形貌、粗糙度、物相及显微组织,结果表明:分别采用这三种辅助气体时,切缝均窄细平直,挂渣量依次增多;垂直度分别为0.08mm、0.08mm和0.05m;切面粗糙度分别为2.870μm、3.554μm、7.974μm;切面物相分别为Al+Al3Mg2、Al+Al3Mg2+AlN、Al+Al3Mg2+Al2O3;热影响区宽度分别为90μm、100μm、不明显;辅助气体压力对切缝宽度的影响不明显。
The high power pulsed solid Nd: YAG laser was used to cut the 4mm thick 5A06 aluminum alloy plate to investigate the influence of the auxiliary gases Ar, N2, O2 on the laser cutting quality. The morphology, roughness, phase and microstructure of the kerf and section were analyzed by optical microscope, scanning electron microscope, roughness measuring instrument and X-ray diffractometer. The results showed that when using these three kinds of auxiliary gases respectively, The widths of the cross sections were 0.08mm, 0.08mm and 0.05m respectively; the roughness of the sections were 2.870μm, 3.554μm and 7.974μm, respectively; the phases of the sections were Al + Al3Mg2, Al + Al3Mg2 + AlN, Al + Al3Mg2 + Al2O3; the width of heat-affected zone is 90μm, 100μm, respectively, which is not obvious; the influence of auxiliary gas pressure on the width of kerf is not obvious.