交流點焊機小電壓大電流的原因

    如(ru)果有幾(ji)臺點(dian)焊機，不(bu)知道是什么型號(hao)的，不(bu)知道怎(zen)么用，拿條(tiao)線(xian)（銅(tong)細線(xian)）然后(hou)焊在一(yi)(yi)個(ge)焊片端子上(shang)(shang)，機臺就是上(shang)(shang)下型的。上(shang)(shang)面那一(yi)(yi)條(tiao)好(hao)像是鋼條(tiao)來的，下面有一(yi)(yi)個(ge)銅(tong)塊，下面有個(ge)踏板，踩一(yi)(yi)下上(shang)(shang)面那個(ge)鋼條(tiao)就下來 把(ba)產品放到他們之間，有時候還會有火(huo)花(hua) 銅(tong)線(xian)就和焊片接上(shang)(shang)了，我也看了些資料，但太專業了，看不(bu)懂。

    問題就(jiu)是(shi)：那(nei)個變壓(ya)器出來的(de)怎么(me)(me)會(hui)是(shi)小電壓(ya)大(da)電流呢？然后我(wo)們在作業的(de)時(shi)候，手是(shi)直(zhi)接(jie)接(jie)觸于焊(han)片上的(de)，人怎么(me)(me)會(hui)沒事啊，說(shuo)說(shuo)點焊(han)機的(de)原理和(he)常見問題處理 是(shi)公(gong)司用(yong)的(de)那(nei)種點焊(han)機，一(yi)米高左右，動(dong)作時(shi)氣動(dong)的(de)，低電壓(ya)怎么(me)(me)會(hui)有(you)高電流呢？高電流不(bu)會(hui)傷(shang)人嘛(ma)？能不(bu)能把使(shi)用(yong)過(guo)(guo)程中肯能會(hui)出現的(de)問題和(he)使(shi)用(yong)方法又(you)是(shi)什么(me)(me)呢？人體和(he)金(jin)屬(shu)(shu)不(bu)都是(shi)導體嘛(ma)，怎么(me)(me)會(hui)只過(guo)(guo)金(jin)屬(shu)(shu)而不(bu)過(guo)(guo)人呢？

    其實(shi)呢首(shou)先變(bian)壓(ya)(ya)器(qi)(qi)負載的(de)(de)功率(lv)是(shi)一定的(de)(de)，而(er)功率(lv)為(wei)電(dian)(dian)(dian)壓(ya)(ya)與電(dian)(dian)(dian)流(liu)的(de)(de)乘(cheng)積，所以變(bian)壓(ya)(ya)器(qi)(qi)把電(dian)(dian)(dian)壓(ya)(ya)降(jiang)低(di)就(jiu)會(hui)(hui)把電(dian)(dian)(dian)流(liu)增大(da)(da)，點(dian)焊(han)(han)機(ji)(ji)變(bian)壓(ya)(ya)器(qi)(qi)就(jiu)是(shi)將(jiang)工(gong)(gong)業(ye)用(yong)電(dian)(dian)(dian)380V電(dian)(dian)(dian)降(jiang)壓(ya)(ya)到(dao)10左右的(de)(de)低(di)壓(ya)(ya)電(dian)(dian)(dian)，并輸(shu)出大(da)(da)電(dian)(dian)(dian)流(liu)。電(dian)(dian)(dian)阻(zu)(zu)點(dian)焊(han)(han)機(ji)(ji)是(shi)利用(yong)大(da)(da)電(dian)(dian)(dian)流(liu)通過(guo)工(gong)(gong)件(jian)(jian)本(ben)身的(de)(de)電(dian)(dian)(dian)阻(zu)(zu)時(shi)會(hui)(hui)產生大(da)(da)量的(de)(de)熱(re)(re)量，從(cong)而(er)融化金(jin)(jin)屬(shu)(shu)工(gong)(gong)件(jian)(jian)，并施加一定壓(ya)(ya)力使金(jin)(jin)屬(shu)(shu)件(jian)(jian)焊(han)(han)接(jie)在(zai)一起的(de)(de)。熱(re)(re)量Q=I“RT,由(you)此可見點(dian)焊(han)(han)機(ji)(ji)參數(shu)主要由(you)電(dian)(dian)(dian)流(liu)，電(dian)(dian)(dian)阻(zu)(zu)，和時(shi)間(jian)控制。人(ren)(ren)接(jie)觸大(da)(da)電(dian)(dian)(dian)流(liu)是(shi)因為(wei)沒有跟變(bian)壓(ya)(ya)器(qi)(qi)形成(cheng)回路。人(ren)(ren)體(ti)電(dian)(dian)(dian)阻(zu)(zu)相對于金(jin)(jin)屬(shu)(shu)工(gong)(gong)件(jian)(jian)的(de)(de)電(dian)(dian)(dian)阻(zu)(zu)來說(shuo)要大(da)(da)的(de)(de)太多，所以電(dian)(dian)(dian)流(liu)基本(ben)上不(bu)流(liu)過(guo)人(ren)(ren)體(ti)。