焊条和焊件分别和电源的两个输出端相连。开始焊接时先让焊条和焊件接触。这时电源短路，流过接触处的电流很大，再加上焊条和焊件的接触面较粗糙，实际上只有几个点接触，接触电阻较大，所以接触处产生很大的热量。稍后提焊条，让焊条和焊件有一定的间隙。

Welding rod and welding pieces of respectively and the two output terminal of the power supply. Began to welding to welding rod and welding pieces of contact. When power supply circuit, a current through the contact point, coupled with the welding rod and welding pieces of the contact surface is rough, in fact, only a few contacts, contact resistance is bigger, so a lot of heat generated by the contact point. Later welding rod, welding rod and welding pieces of a certain gap.

交流电焊机实际上是一种特殊用途的降压变压器，具有陡降的外特性。为了保证其陡降的外特性及交流电弧的稳定燃烧。在电焊机中应有较大的慈抗。而获得感抗的方法一般是靠增加电焊变压器自身的漏感或在变压器副边回路中串联电抗器。同时，为了满足焊接电流大小变化的需要，电焊机的感抗应是可调的。根据获得陡降外特性的方法不同，交流电焊机可分为两大类，即串联电抗器类和漏磁变压器类。

Ac arc welder is actually a kind of special use step-down transbbbber, with a steep fall in external characteristic. In order to guarantee the steep fall in external characteristic and the stability of the ac arc burning. In the welder should have greater resistance. And get the impedance bbbbbb is usually by increasing welding leakage inductance of the transbbbber itself or at the edge of the transbbbber, deputy series reactor in the loop. At the same time, in order to meet the needs of the welding current size change, the impedance of electric welding machine should be adjustable. According to obtain the steep fall in the nature of these different, ac arc welder can be divided into two categories, namely, serial reactor and magnetic flux leakage transbbbber.

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