Parameter Optimization and Prediction Model of Induction Heating for Large-Diameter Pipe

Table 2

Test parameters and levels.

Level	Factor
	Current Frequency (Hz)	Current Density (A/m^2)	Air Gap; (mm)
1	600	5×10^7	10
2	800	5.5×10^7	20
3	1000	6×10^7	30
4	1200	6.5×10^7	40
5	1500	7×10^7	50