" 摘要：根据激光深熔焊存在小孔现象的特点，利用符合小孔形貌特点的高斯旋转曲面体热源进行加载，得到了随激光工艺参数改变而变化的小孔形貌。建立符合小孔尺寸的微米级精细计算模型，分析随工艺参数变化的激光焊接温度梯度分布特征。通过分析小孔特征尺寸及特征温度梯度，得出对小孔形貌及温度梯度影响最大的工艺参数。研究了小孔形貌特征形成与激光深熔焊温度梯度之间的定性关系。 ZHANGKe-rong，ZHANGJian-xun Abstract：Accordingtolaserdeeppenetrationweldingexistingthecharacteristicsofkeyhole，createamicron?sizeprecisecalculationmodelthatcoincidencewiththekeyholeprofile．UsekeyholemorphologyheatsourcemodelGaussianrotatingcurvedbodyheatsourceforloading．Obtainthechangeruleofkeyholeprofileandtemperaturegradientwiththelaserprocessparametersvariety．Throughanalyzingthefeaturesizeandtemperaturegradientinkeyholetocomerightthegreatestimpactparametersforkeyholeprofileandtemperaturegradientoflaserpenetrationwelding．Analyzetheruleofeverytechnologicalparametersoflaser，andgainthebestlaserparametersvalueforthekeyholeprofileandtemperaturegradient．Studytherelationshipbetweenkeyholeprofileandtemperaturegradient． |
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