點焊機的工藝與原理

　　1、焊接時(shi)間(jian)：在焊接中低碳鋼時(shi)，點(dian)焊機可利用強規(gui)范(fan)焊接法(瞬時(shi)通(tong)電)或弱規(gui)范(fan)焊接法(長時(shi)通(tong)電)。在大量生產時(shi)應采用強規(gui)范(fan)焊接法，它能(neng)(neng)提高生產效率，減少電能(neng)(neng)消(xiao)耗及減輕工件變形。

　　2、焊(han)接(jie)電(dian)(dian)(dian)流：焊(han)接(jie)電(dian)(dian)(dian)流決定于焊(han)件(jian)之(zhi)大(da)小、厚度(du)及接(jie)觸(chu)表面的情況(kuang)。通常金(jin)屬導電(dian)(dian)(dian)率越(yue)高，電(dian)(dian)(dian)極壓力越(yue)大(da)，焊(han)接(jie)時間應越(yue)短。此時所需的電(dian)(dian)(dian)流密度(du)也(ye)隨之(zhi)增大(da)。

　　3、電極(ji)壓力：電極(ji)對(dui)焊件施加(jia)壓力的目的是為了減(jian)小(xiao)焊點處的接觸電阻，并保證焊點形成時所需要(yao)的壓力。