YAG-MIG复合焊接5A90等离子体光谱分析与温度计算
Spectra analysis and temperature measure of plasmas in YAG-MIG hybrid welding of 5A90
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摘要: 5A90铝锂合金在航空航天中的重要应用使得对其焊接性的研究变得尤为重要.在YAG-MIG复合焊接5A90的条件下,使用光谱仪对焊接过程中金属蒸气/等离子体进行监测,获得了其特征光谱分布,并由谱线相对强度法计算获得了金属蒸气/等离子体的温度,并对焊接工艺参数对金属蒸气/等离子体温度的影响进行了探讨.结果表明,复合焊接的特征光谱在350~850 nm范围内以大量的高强度的氩离子谱线为主,伴有少量镁、锂离子.得到了一组工艺参数下复合焊接5A90过程中等离子体的平均温度为6554 K,比同等工艺参数水平下YAG焊的增加了将近1200 K,而与电弧焊的比较接近。Abstract: The spectra of vapor/plasmas were acquired by spectrometer during YAG-MIG hybrid welding of 5A90 Al-Li alloys in our research. The temperature values of the vapor/plasmas were calculated by the methods of relative intensity.The effects of arc current and heat input on the temperature of the vapor/plasmas were discussed.The results show that the spectra of hybrid welding in the range of 350-850 nm is mainly argon ion spectra line accompanied with a few Mg and Li ion.An average temperature under a set of processing parameters is 6554 K;compared to YAG welding, the value has an increase of 1200 K;however, it is near to the average temperature of MIG welding.
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