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)焊(han)(han)機(ji)按(an)(an)照(zhao)用(yong)途分(fen)，有(you)(you)通用(yong)式(shi)(shi)(shi)(shi)(shi)、專用(yong)式(shi)(shi)(shi)(shi)(shi);按(an)(an)照(zhao)同時(shi)焊(han)(han)接的(de)焊(han)(han)點(dian)數目分(fen)，有(you)(you)單點(dian)式(shi)(shi)(shi)(shi)(shi)、雙點(dian)式(shi)(shi)(shi)(shi)(shi)、多點(dian)式(shi)(shi)(shi)(shi)(shi);按(an)(an)照(zhao)導電(dian)(dian)方式(shi)(shi)(shi)(shi)(shi)分(fen)，有(you)(you)單側的(de)、雙側的(de);按(an)(an)照(zhao)加壓(ya)機(ji)構的(de)傳動(dong)方式(shi)(shi)(shi)(shi)(shi)分(fen)，有(you)(you)腳踏(ta)式(shi)(shi)(shi)(shi)(shi)、電(dian)(dian)動(dong)機(ji)-凸(tu)輪式(shi)(shi)(shi)(shi)(shi)、氣壓(ya)式(shi)(shi)(shi)(shi)(shi)、液壓(ya)式(shi)(shi)(shi)(shi)(shi)、復合式(shi)(shi)(shi)(shi)(shi)(氣液壓(ya)合式(shi)(shi)(shi)(shi)(shi));按(an)(an)照(zhao)運轉的(de)特性(xing)分(fen)，有(you)(you)非自動(dong)化、自動(dong)化;按(an)(an)照(zhao)安裝的(de)方法(fa)分(fen)，有(you)(you)固(gu)定式(shi)(shi)(shi)(shi)(shi)，移動(dong)式(shi)(shi)(shi)(shi)(shi)或輕便式(shi)(shi)(shi)(shi)(shi)(懸掛式(shi)(shi)(shi)(shi)(shi));按(an)(an)照(zhao)焊(han)(han)機(ji)的(de)活動(dong)電(dian)(dian)極(普(pu)通是上(shang)電(dian)(dian)極)的(de)移動(dong)方向分(fen)，有(you)(you)垂直行程(cheng)(電(dian)(dian)極作直線(xian)運動(dong))、圓弧行程(cheng);按(an)(an)照(zhao)電(dian)(dian)能(neng)的(de)供(gong)給方式(shi)(shi)(shi)(shi)(shi)分(fen)，有(you)(you)工頻焊(han)(han)機(ji)(采用(yong)50赫茲交流電(dian)(dian)源)、脈沖焊(han)(han)機(ji)、變頻焊(han)(han)機(ji)。

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