Abstract: For its appearance, its electrical, mechanical and thermal characteristics, as well as its stability, it is found that using a DCMF re-constriction plasma arc and cutting along the major axis of its cross-section is able to effectively improve cut quality, process stability and cutting productivity. Given in this paper are the results from the cutting tests on 16～20mm 1Cr18Ni9Ti plates, also given are discussions on the structures of DCMF magnetic head, the physical features and technological characteristics of DCME re-constriction plasma arc, and on the choise of cutting parameters and the uniqueness of cut quality.

Key words: 磁场, 等离子, 切割