Plasma transferred arc produces the induced electromagnetic field that makes liquid metal convect in molten pool in the surface metallurgical course.
在表面冶金过程中等离子束产生感生磁场，使熔池内液态金属产生对流运动。
At the same time, we introduce a kind of two dimensional inverse heat conduction problems which do not convect with outer space in doing the compression, and we have got the expected result.
