Effect of the Cryogenically Treated Copper Nozzle Used in Plasma Arc Machining of S235 Steel

Table 6

EDS values of (a) nontreated and (b) cryogenically treated.

Elements	Weight %	Atomic %
(a)
C K	48.20	59.24
O K	41.61	38.39
Cu K	10.19	2.37
Total	100.00
(b)
C K	37.77	44.89
O K	54.80	53.44
Cu K	7.43	1.67
Total	100.00