常見的點焊方法是雙面點焊(電極(ji)從工件兩(liang)側(ce)供(gong)電)，的場合。點焊接(jie)頭(tou)的尺寸可(ke)參考表3．8．1大(da)致(zhi)確定，常用金屬材(cai)料(liao)的焊接(jie)點距見表3．8．2。

焊(han)(han)(han)(han)接操作機點(dian)(dian)(dian)焊(han)(han)(han)(han)是依靠被焊(han)(han)(han)(han)工件(jian)接觸面之間形(xing)成的(de)焊(han)(han)(han)(han)點(dian)(dian)(dian)、將工件(jian)連接起來的(de)電(dian)(dian)阻焊(han)(han)(han)(han)方法(fa)。按(an)一次(ci)形(xing)成的(de)焊(han)(han)(han)(han)點(dian)(dian)(dian)數，可分(fen)為單點(dian)(dian)(dian)焊(han)(han)(han)(han)和多(duo)點(dian)(dian)(dian)焊(han)(han)(han)(han)；按(an)對焊(han)(han)(han)(han)件(jian)的(de)供電(dian)(dian)方向(xiang)，可分(fen)為單面點(dian)(dian)(dian)焊(han)(han)(han)(han)和雙面點(dian)(dian)(dian)焊(han)(han)(han)(han)等。典型的(de)點(dian)(dian)(dian)焊(han)(han)(han)(han)方法(fa)。

點焊是一種高速、經濟的連接(jie)方法，適用(yong)(yong)于制(zhi)造可裝配成(cheng)搭接(jie)接(jie)頭、接(jie)頭無密封(feng)性要(yao)求(qiu)的薄板構件，如汽車駕(jia)駛室、轎車車身、 長機機翼、儀表(biao)殼體，也(ye)可用(yong)(yong)于焊接(jie)建筑用(yong)(yong)鋼筋(jin)、電器元(yuan)件引線(xian)、家用(yong)(yong)電器等(deng)。

通(tong)(tong)用(yong)焊(han)(han)(han)(han)機(ji)可焊(han)(han)(han)(han)接(jie)多種(zhong)不同厚度和形狀的工件(jian)(jian)，用(yong)焊(han)(han)(han)(han)機(ji)則用(yong)于焊(han)(han)(han)(han)接(jie)形狀、尺(chi)寸、厚度、材質(zhi)接(jie)近的類型的工件(jian)(jian)。中(zhong)大功率焊(han)(han)(han)(han)機(ji)重量大，一般都固定(ding)安裝(zhuang)。焊(han)(han)(han)(han)接(jie)操作機(ji)外(wai)形復(fu)雜或尺(chi)寸較(jiao)大的薄壁工件(jian)(jian)時，工件(jian)(jian)通(tong)(tong)常不動(dong)而(er)使焊(han)(han)(han)(han)接(jie)機(ji)(焊(han)(han)(han)(han)鉗)相對(dui)工件(jian)(jian)移動(dong)。

直(zhi)壓式焊(han)(han)機(ji)(ji)(ji)的(de)(de)下電(dian)極(ji)通(tong)(tong)常固(gu)定不(bu)動(dong)，而(er)上電(dian)極(ji)沿(yan)垂直(zhi)方向作直(zhi)線(xian)運動(dong)。電(dian)極(ji)壓力(li)通(tong)(tong)過氣缸或(huo)油缸帶動(dong)電(dian)極(ji)施加于(yu)(yu)工件(jian)。通(tong)(tong)用(yong)(yong)(yong)直(zhi)壓式批量(liang)焊(han)(han)接(jie)(jie)變位機(ji)(ji)(ji)大(da)多(duo)數采(cai)用(yong)(yong)(yong)氣動(dong)加壓系統，既能(neng)(neng)用(yong)(yong)(yong)于(yu)(yu)點(dian)焊(han)(han)也能(neng)(neng)用(yong)(yong)(yong)于(yu)(yu)凸(tu)焊(han)(han)(圖3．8．12)。點(dian)焊(han)(han)機(ji)(ji)(ji)的(de)(de)管伸長度一般(ban)較大(da)，而(er)凸(tu)焊(han)(han)機(ji)(ji)(ji)的(de)(de)臂伸長度都很小(xiao)(xiao)(因剛(gang)度要求高)。此外，焊(han)(han)接(jie)(jie)機(ji)(ji)(ji)器人凸(tu)焊(han)(han)機(ji)(ji)(ji)要求加壓機(ji)(ji)(ji)構(gou)的(de)(de)隨動(dong)性(xing)要好，因而(er)均(jun)采(cai)用(yong)(yong)(yong)滾動(dong)導軌、小(xiao)(xiao)質量(liang)活塞(sai)和蝶形彈簧緩(huan)沖(chong)等措(cuo)施，以提高電(dian)極(ji)運動(dong)部分(fen)的(de)(de)跟隨性(xing)。

大多數(shu)通用點(dian)焊(han)機(ji)采用雙面饋(kui)電，可(ke)用于焊(han)接多種(zhong)尺(chi)寸和(he)形狀、多類金屬材料(liao)的(de)工(gong)件，通常一次焊(han)接循環獲得一個焊(han)點(dian)。單面點(dian)焊(han)可(ke)提生產(chan)率(lv)，減小焊(han)接變形，并可(ke)從單面接近某些(xie)可(ke)達性差的(de)焊(han)件。