【摘要】 采用LSM2 4 0型全自动CO2 激光焊接机焊接粉末材料 ,研究不同粉末材料产生等离子体所需的临界激光功率。粉末配方为 :Fe粉 +15 %羟基Fe粉 ,Co粉 ,Ni粉 +15 %羟基Ni粉三种试样。研究结果表明 ,Fe ,Co ,Ni三种试样在CO2 激光作用下产生金属蒸气时的临界激光功率密度IC 为ICFe >ICCo >ICNi;等离子体得以有效控制的下限临界气流量QS 为QFeS <QCoS <QNiS 。更多还原

【Abstract】 The critical laser power density to induce plasma for different powders is studied in this article by means of fully-automatic laser welding machine LSM240. The powder components are FFe+15%TFe, FCo and FNi+15%TNi. The results show that the critical laser power density （I_C） to create plasma under the radiation of CO₂ laser beam for the three kinds of PM materials is I CFe>I CCo>I CNi, and the low critical gas flux Q_S is Q Fe_S<Q Co_S<Q Ni_S when the plasma has been efficiently controlled.更多还原