在自制设备的基础上,进行了氮气等离子弧不锈钢手工切割试验研究,本文综合分析了等离子弧工艺参数对稳定性、割口质量及生产率的影响。并初步研究了不锈钢切割时割口底部熔瘤的形成过程和消除途径,以及喷咀烧损的原因和提高寿命的措施。同时进行了等离子弧割口与鉋削加工不锈钢坡口在焊接后性能的比较,并提出了厚度为8～20毫米不锈钢板合适的切割规范。 Based on the self-made equipment, a nitrogen plasma arc stainless steel manual cutting test was conducted. The effects of plasma arc process parameters on stability, cutting quality and productivity were analyzed. The formation process and elimination of the nicking at the bottom of the notch during the stainless steel cutting were also studied. The reasons for the burning of the nozzle and the measures to increase the service life were also studied. At the same time, the comparison between the performance of the plasma arc cutting and the stainless steel beveling after the welding was carried out, and the suitable cutting specification of the stainless steel plate with the thickness of 8-20 millimeters was proposed.