點焊機的工藝與原理

　　1、焊(han)接時(shi)間：在焊(han)接中低碳(tan)鋼(gang)時(shi)，點焊(han)機(ji)可(ke)利用(yong)強規(gui)范(fan)焊(han)接法(瞬時(shi)通電(dian)(dian))或弱規(gui)范(fan)焊(han)接法(長時(shi)通電(dian)(dian))。在大量生產時(shi)應采用(yong)強規(gui)范(fan)焊(han)接法，它能(neng)提高生產效(xiao)率，減少電(dian)(dian)能(neng)消耗及減輕工件變形。

　　2、焊(han)接(jie)電(dian)(dian)流：焊(han)接(jie)電(dian)(dian)流決(jue)定于焊(han)件之大(da)小(xiao)、厚度及接(jie)觸(chu)表面的(de)情況。通(tong)常金(jin)屬導電(dian)(dian)率越(yue)(yue)高，電(dian)(dian)極壓(ya)力(li)越(yue)(yue)大(da)，焊(han)接(jie)時(shi)間應越(yue)(yue)短(duan)。此時(shi)所需的(de)電(dian)(dian)流密度也隨(sui)之增大(da)。

　　3、電(dian)(dian)極壓力：電(dian)(dian)極對焊(han)件施加壓力的目(mu)的是為了減小焊(han)點(dian)處的接觸電(dian)(dian)阻，并保(bao)證焊(han)點(dian)形成時所需要的壓力。