中頻點焊機工作時給兩個金屬電工件加壓，使兩層金屬在兩電的壓力下構成的接觸電阻，而焊接電流從一電流經另一電時在兩接觸電阻點構成瞬時的熱熔接，且焊接電流瞬時從另一電沿兩工件流至此電構成回路，不傷及被焊工件的內部結構。點焊機是選用雙面雙點過流焊接的原理。
中頻點焊機的工作(zuo)原理介紹
點焊(han)的工(gong)藝進程為：首(shou)先開(kai)通冷(leng)(leng)卻水;然后(hou)將焊(han)件表(biao)(biao)面清(qing)理干凈，安(an)裝后(hou)，送入(ru)上、下電(dian)(dian)(dian)之間，施加壓力(li)，使(shi)(shi)其接觸良好;通電(dian)(dian)(dian)使(shi)(shi)兩工(gong)件接觸表(biao)(biao)面受熱，局部熔(rong)化，構成熔(rong)核(he);然后(hou)斷(duan)電(dian)(dian)(dian)后(hou)保持壓力(li)，使(shi)(shi)熔(rong)核(he)在壓力(li)下冷(leng)(leng)卻凝(ning)結，構成焊(han)點;后(hou)去掉壓力(li)，取出工(gong)件。焊(han)接電(dian)(dian)(dian)流、電(dian)(dian)(dian)壓力(li)、通電(dian)(dian)(dian)時間及電(dian)(dian)(dian)工(gong)作表(biao)(biao)面尺寸等點焊(han)工(gong)藝參數對(dui)焊(han)接質量有嚴(yan)重(zhong)影響。
中(zhong)頻點(dian)焊(han)(han)機(ji)運用(yong)正(zheng)負(fu)在瞬時短(duan)路時產生的高溫(wen)電(dian)(dian)弧來熔(rong)化電(dian)(dian)間的被焊(han)(han)工件，來達(da)到使(shi)它們在一(yi)起(qi)的目的。點(dian)焊(han)(han)機(ji)的結構十(shi)分簡單，其(qi)實(shi)就是(shi)一(yi)個大功率的變壓(ya)器，將交(jiao)流電(dian)(dian)變為(wei)低電(dian)(dian)壓(ya)，大電(dian)(dian)流的電(dian)(dian)源，可以(yi)是(shi)直流的也可以(yi)交(jiao)流的。點(dian)焊(han)(han)變壓(ya)器有本(ben)身的特征，就是(shi)有電(dian)(dian)壓(ya)急(ji)劇下降的特性(xing)。中(zhong)頻點(dian)焊(han)(han)機(ji)是(shi)一(yi)種(zhong)電(dian)(dian)阻焊(han)(han)機(ji)。由觸(chu)摸屏(ping)實(shi)現一(yi)屏(ping)操控，顯示(shi)器能夠顯示(shi)每次焊(han)(han)接的焊(han)(han)接電(dian)(dian)流，并且能及時的顯示(shi)故(gu)障及錯(cuo)誤警告。
