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本文从新的角度，采用理论分析与正交试验研究相结合的方法，提出了线能Ｗｅ、比影响力ｆｓ等实用概念，探讨了等离子切割过程中成渣的能量与约束之间匹配条件。研究表明：成渣是切割过程中在一定的约束条件的输入能量的转换、传递与分布的结果，无渣的关键在于有足够的输入能量与良好约束的匹配；反映等离子弧能量及约束状态的Ｗｅ，与切口粘渣量的指标Ｇ之间有确定的关系，表现为Ｇ－Ｗｅ曲线；切透条件是Ｗｅ＞Ｗｅｃ（临界线能），／ｍｍ２；Ｇ－Ｗｅ曲线还反映了等离子炬的性能。
In this paper, from the new perspective, a combination of theoretical analysis and orthogonal experimental research is proposed, and practical concepts such as linear energy We and specific influencing factor fs are put forward. The matching conditions between energy and confinement in plasma cutting process are discussed. The results show that slag formation is the result of the conversion, transmission and distribution of input energy under certain constraints during the cutting process. The key to slaglessness is that there is enough input energy to match the good constraint. The energy of the plasma arc and the constraint state We has a definite relationship with the index G of the amount of incision sticky slag, which manifests as a G-We curve; the cut-through condition is We> Wec (critical line energy) / mm2; performance.