點焊機系采用雙面雙點過流焊接的原理，工作時兩個電極加壓工件使兩層金屬在兩電極的壓力下形成一定的接觸電阻，而焊接電流從一電極流經另一電極時在兩接觸電阻點形成瞬間的熱熔接，且焊接電流瞬間從另一電極沿兩工件流至此電極形成回路，并且不會傷及被焊工件的內部結構。
點(dian)(dian)(dian)焊(han)機按(an)照(zhao)用(yong)途分(fen)，有(you)(you)(you)通(tong)用(yong)式(shi)(shi)(shi)(shi)(shi)、專用(yong)式(shi)(shi)(shi)(shi)(shi);按(an)照(zhao)同(tong)時焊(han)接(jie)的焊(han)點(dian)(dian)(dian)數目分(fen)，有(you)(you)(you)單點(dian)(dian)(dian)式(shi)(shi)(shi)(shi)(shi)、雙點(dian)(dian)(dian)式(shi)(shi)(shi)(shi)(shi)、多(duo)點(dian)(dian)(dian)式(shi)(shi)(shi)(shi)(shi);按(an)照(zhao)導(dao)電方式(shi)(shi)(shi)(shi)(shi)分(fen)，有(you)(you)(you)單側(ce)的、雙側(ce)的;按(an)照(zhao)加壓機構的傳動方式(shi)(shi)(shi)(shi)(shi)分(fen)，有(you)(you)(you)腳踏式(shi)(shi)(shi)(shi)(shi)、電動機-凸輪式(shi)(shi)(shi)(shi)(shi)、氣壓式(shi)(shi)(shi)(shi)(shi)、液(ye)壓式(shi)(shi)(shi)(shi)(shi)、復(fu)合式(shi)(shi)(shi)(shi)(shi)(氣液(ye)壓合式(shi)(shi)(shi)(shi)(shi));按(an)照(zhao)運(yun)轉的特性分(fen)，有(you)(you)(you)非自(zi)動化、自(zi)動化;按(an)照(zhao)安裝(zhuang)的方法分(fen)，有(you)(you)(you)固定式(shi)(shi)(shi)(shi)(shi)，移(yi)動式(shi)(shi)(shi)(shi)(shi)或(huo)輕便式(shi)(shi)(shi)(shi)(shi)(懸掛(gua)式(shi)(shi)(shi)(shi)(shi));按(an)照(zhao)焊(han)機的活動電極(ji)(普通(tong)是上電極(ji))的移(yi)動方向分(fen)，有(you)(you)(you)垂直行程(電極(ji)作直線運(yun)動)、圓弧(hu)行程;按(an)照(zhao)電能的供給方式(shi)(shi)(shi)(shi)(shi)分(fen)，有(you)(you)(you)工頻焊(han)機(采用(yong)50赫茲交流電源)、脈沖(chong)焊(han)機、變(bian)頻焊(han)機。

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