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采用高速摄像机、电流电压采集仪及光谱分析仪分别研究低功率YAG激光-熔化极气体弧焊(GMAW)复合焊接过程中的电弧形态、电压特点及局部电子温度、密度变化。在此基础上,运用等离子体热力学平衡理论分析复合焊接电弧等离子体的行为特征。试验表明,低功率YAG激光吸引、压缩GMAW电弧,提高电弧局部区域的电子温度至(15400±900)K,电子密度至(1.265±0.101)×1017cm-3,降低了GMAW热源输出电压,促进了焊接电弧等离子体局部热力学平衡(LTE)的建立。
High-speed cameras, current and voltage collectors and spectral analyzers were used to study the changes of arc shape, voltage and local electron temperature and density in low-power YAG laser-GMAW welding. Based on this, the behavior characteristics of composite welding arc plasma are analyzed by using the theory of plasma thermodynamic equilibrium. Experiments show that the low-power YAG laser attracts and compresses the GMAW arc, increases the electron temperature to (15400 ± 900) K and the electron density to (1.265 ± 0.101) × 1017cm-3 in the local area of the arc, reduces the output voltage of the GMAW heat source, ESTABLISHMENT OF WELDING ARC PLASMA LOCAL THERMODYNAMIC BALANCE (LTE).