交流點焊機小電壓大電流的原因

    如果(guo)有(you)幾臺(tai)(tai)點焊(han)機，不(bu)知(zhi)道是(shi)什么型(xing)號(hao)的(de)，不(bu)知(zhi)道怎(zen)么用，拿條(tiao)線(xian)（銅細線(xian)）然后焊(han)在一個(ge)焊(han)片(pian)端子上(shang)(shang)(shang)，機臺(tai)(tai)就(jiu)是(shi)上(shang)(shang)(shang)下(xia)型(xing)的(de)。上(shang)(shang)(shang)面(mian)那(nei)一條(tiao)好像是(shi)鋼條(tiao)來的(de)，下(xia)面(mian)有(you)一個(ge)銅塊，下(xia)面(mian)有(you)個(ge)踏板，踩一下(xia)上(shang)(shang)(shang)面(mian)那(nei)個(ge)鋼條(tiao)就(jiu)下(xia)來 把產(chan)品放到他(ta)們之間，有(you)時(shi)候還會(hui)有(you)火花 銅線(xian)就(jiu)和(he)焊(han)片(pian)接(jie)上(shang)(shang)(shang)了(le)，我(wo)也看(kan)了(le)些(xie)資料，但太專業(ye)了(le)，看(kan)不(bu)懂。

    問題(ti)就是(shi)(shi)：那(nei)個變壓(ya)(ya)器出來的(de)(de)怎(zen)么(me)會(hui)是(shi)(shi)小電壓(ya)(ya)大(da)電流(liu)(liu)(liu)呢(ni)？然(ran)后我們在作業(ye)的(de)(de)時候(hou)，手是(shi)(shi)直接接觸于焊片上的(de)(de)，人怎(zen)么(me)會(hui)沒(mei)事(shi)啊(a)，說說點(dian)焊機(ji)的(de)(de)原理和(he)常見(jian)問題(ti)處(chu)理 是(shi)(shi)公司用的(de)(de)那(nei)種點(dian)焊機(ji)，一米高(gao)左(zuo)右，動(dong)作時氣動(dong)的(de)(de)，低電壓(ya)(ya)怎(zen)么(me)會(hui)有高(gao)電流(liu)(liu)(liu)呢(ni)？高(gao)電流(liu)(liu)(liu)不會(hui)傷(shang)人嘛？能(neng)不能(neng)把(ba)使(shi)用過(guo)程中肯能(neng)會(hui)出現的(de)(de)問題(ti)和(he)使(shi)用方法又是(shi)(shi)什么(me)呢(ni)？人體(ti)(ti)和(he)金屬不都(dou)是(shi)(shi)導體(ti)(ti)嘛，怎(zen)么(me)會(hui)只過(guo)金屬而不過(guo)人呢(ni)？

    其實呢首先變壓(ya)(ya)器負載的功率是(shi)一定的，而功率為(wei)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)與電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)的乘(cheng)積，所以變壓(ya)(ya)器把電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)降低就會把電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)增(zeng)大，點焊(han)機(ji)變壓(ya)(ya)器就是(shi)將(jiang)工(gong)業用電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)380V電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)降壓(ya)(ya)到(dao)10左右的低壓(ya)(ya)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)，并輸出大電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)。電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)點焊(han)機(ji)是(shi)利用大電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)通過工(gong)件(jian)本身的電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)時會產生大量(liang)的熱量(liang)，從而融化金屬工(gong)件(jian)，并施加一定壓(ya)(ya)力(li)使金屬件(jian)焊(han)接在一起的。熱量(liang)Q=I“RT,由(you)此可見點焊(han)機(ji)參數(shu)主要由(you)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)，和時間控制(zhi)。人接觸(chu)大電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)是(shi)因(yin)為(wei)沒有(you)跟(gen)變壓(ya)(ya)器形(xing)成回路(lu)。人體電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)相對于金屬工(gong)件(jian)的電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)來說(shuo)要大的太多，所以電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)基本上不流(liu)(liu)過人體。