The result shows that laser induced plasma and weld geometry are sensitive to side nozzle height, its inclination angle and side gas flow rate;
结果表明，侧吹喷嘴高度和侧吹流速的变化对光致等离子体行为和焊缝形貌有显著的影响；
Generally, the steel rolling furnace's service life is 3-10 years, the wrought steel chamber furnace is about 2 years, and the soaking pit side nozzle furnace's is 3-6 years.
轧钢加热炉的使用寿命一般为3 ~10年，锻钢室式加热炉的寿命约为2年，单侧上烧嘴均热炉的使用寿命一般为3 ~6年。
Generally, the steel rolling furnace's service life is 3-10 years, the wrought steel chamber furnace is about 2 years, and the soaking pit side nozzle furnace's is 3-6 years.
轧钢加热炉的使用寿命一般为3 ~10年，锻钢室式加热炉的寿命约为2年，单侧上烧嘴均热炉的使用寿命一般为3 ~6年。
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