In calefactive phase, the electro thermal model of hot bridge wire was established, the calefactive time of invariable current fire case and capacitance discharge fire case were both studied.

在阶段建立桥丝电热型，分别求解恒电流点火电容放电点火。

Thermal ignition temperature was defined,the thermal ignition process of electric hot wire initiating devices was divided as calefactive phase and explosion phase.

义了热点火度,将桥丝式电火工品的热点火过程分为阶段爆炸阶段。