The application of Ar-CO2 mixed gas in the welding of low-carbon steel could improve welding process, increase welding quality and decrease welding cost.
CO2混合气应用在低碳钢焊接上，可以改进焊接工艺，提高焊接质量，降低焊接成本。
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Validated by the experiments, AR model spectrum estimation method is a good way to process flow signal and the results of it is more accuracy than the results that gain by count method.
With the industrial data, this model could forecast the nitrogen content and the Ar blowing time required to control the nitrogen level of the stainless steel in AOD refining process.