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电火花表面热处理即受控电火花放电，使金属表面在一定的温度梯度范围内是相变物理效应．它既不同于采用直流电空气中的电火花表面强化，又不是在介质中的电火花加工．本文对电火花放电的热传导方程与被生产，上采用的激光表面强化处理的热传导方程进行比较，且从强化效果、工件表层的金相组织与表层显微硬度的比较中得出；电火花表面热处理与激光表面热处理的效果相近，加之电火花加工设备比激光设备便宜得多，所以它很可能成为一种经济可行的新型表面热处理方法．
EDM surface heat treatment that is controlled by spark discharge, the metal surface in a certain temperature gradient is the phase transition of physical effects. It is different from the EDM surface hardening in direct current air and is not EDM in the medium. In this paper, the thermal conductivity equation of EDM is compared with the heat conduction equation of the laser surface strengthened and produced by the production, and from the comparison of the strengthening effect, the microstructure of the surface of the workpiece and the microhardness of the surface layer, Heat treatment and laser surface heat treatment effect is similar, coupled with EDM equipment much cheaper than laser equipment, so it is likely to become a cost-effective new surface heat treatment method.