焊(han)(han)接按其工藝過程的特點分有熔焊(han)(han)、壓焊(han)(han)和釬(han)焊(han)(han)三大類(lei)。

其特點分別是：

1、熔(rong)(rong)(rong)(rong)焊：加熱欲接(jie)(jie)合(he)之工件使之局部熔(rong)(rong)(rong)(rong)化形成熔(rong)(rong)(rong)(rong)池，熔(rong)(rong)(rong)(rong)池冷卻凝固后便(bian)接(jie)(jie)合(he)，必要時可(ke)加入(ru)熔(rong)(rong)(rong)(rong)填物(wu)輔助，它(ta)是適合(he)各種金屬和合(he)金的焊接(jie)(jie)加工，不需壓(ya)力。

2、壓(ya)焊：焊接(jie)過程(cheng)必(bi)須對焊件施(shi)加壓(ya)力，屬(shu)于各種金屬(shu)材(cai)料和部分金屬(shu)材(cai)料的(de)加工。

3、釬(han)(han)焊(han)：采用(yong)比母(mu)(mu)材(cai)(cai)熔點低(di)的金(jin)屬(shu)材(cai)(cai)料(liao)(liao)做(zuo)釬(han)(han)料(liao)(liao)，利用(yong)液態(tai)釬(han)(han)料(liao)(liao)潤濕母(mu)(mu)材(cai)(cai)，填(tian)充接(jie)頭間隙，并與(yu)母(mu)(mu)材(cai)(cai)互相(xiang)擴散實現鏈接(jie)焊(han)件。適(shi)合于各種材(cai)(cai)料(liao)(liao)的焊(han)接(jie)加工(gong)(gong)，也適(shi)合于不同金(jin)屬(shu)或異類材(cai)(cai)料(liao)(liao)的焊(han)接(jie)加工(gong)(gong)。