電極鹽浴爐 通過金屬電極將低壓 (5.5~36伏)大(da)電流交流電引入爐內，電流流過鹽(yan)(yan)液(ye)發熱。鹽(yan)(yan)液(ye)既是發熱體(ti)，又是對工件加熱的介質。鹽(yan)(yan)液(ye)溫度依鹽(yan)(yan)液(ye)成(cheng)分而不(bu)同，一般在150~1300℃之間。磁場(chang)的作用能(neng)使(shi)(shi)鹽(yan)液(ye)循環翻動(dong)，有(you)利于鹽(yan)液(ye)溫(wen)度(du)均勻，又能(neng)提高工(gong)件(jian)的加(jia)熱(re)速度(du)。電(dian)(dian)(dian)極鹽(yan)浴爐(lu)(lu)由(you)電(dian)(dian)(dian)極、耐火爐(lu)(lu)襯(chen)、密封金屬爐(lu)(lu)罐、絕熱(re)層和爐(lu)(lu)殼構成，由(you)專(zhuan)用鹽(yan)浴爐(lu)(lu)變壓器(qi)供電(dian)(dian)(dian)。因(yin)固態(tai)鹽(yan)不(bu)導電(dian)(dian)(dian)，開爐(lu)(lu)時先向起動(dong)電(dian)(dian)(dian)極送電(dian)(dian)(dian)，利用起動(dong)電(dian)(dian)(dian)極的電(dian)(dian)(dian)阻(zu)發熱(re)使(shi)(shi)一(yi)部分鹽(yan)先熔化，然后接通(tong)主(zhu)電(dian)(dian)(dian)極使(shi)(shi)電(dian)(dian)(dian)流通(tong)過熔鹽(yan)發熱(re)工(gong)作。主(zhu)電(dian)(dian)(dian)極有(you)插入式(shi)和埋入式(shi)兩種結構形式(shi)。①插入式(shi)電(dian)(dian)(dian)極:電(dian)極從(cong)爐(lu)口插入爐(lu)內。這(zhe)種電(dian)極結構簡單，裝卸方(fang)便。②埋(mai)入式電(dian)極:電(dian)極(ji)埋在鹽中，不(bu)接觸空氣(qi)，使用(yong)壽命(ming)較(jiao)長。用(yong)這種電(dian)極(ji)的爐(lu)膛容積利用(yong)系數(shu)高，但電(dian)極(ji)拆卸較(jiao)困難。兩(liang)種電(dian)極(ji)都可(ke)用(yong)碳鋼(gang)或耐(nai)熱(re)鋼(gang)鍛成(cheng)，也(ye)可(ke)鑄造。
