氬氣(qi)(qi)是(shi)熔(rong)(rong)(rong)化極惰性(xing)氣(qi)(qi)體保護焊(han)(han)最常用(yong)(yong)的保護氣(qi)(qi)體，熔(rong)(rong)(rong)化極氬弧焊(han)(han)在不銹(xiu)鋼(gang)焊(han)(han)接(jie)中應用(yong)(yong)非(fei)常廣(guang)泛，焊(han)(han)接(jie)時(shi)一般采用(yong)(yong)直(zhi)流(liu)(liu)反極性(xing)。焊(han)(han)絲以直(zhi)徑1.6mm為(wei)主要規格，其電(dian)流(liu)(liu)以220~260A,熔(rong)(rong)(rong)滴形式為(wei)噴(pen)射過渡，表6-3為(wei)常見的焊(han)(han)接(jie)參(can)數(shu)。

  在熔(rong)化極氬(ya)弧焊(han)(han)的基礎(chu)上加入(ru)脈(mo)沖電(dian)流(liu)，即脈(mo)沖熔(rong)化極氬(ya)弧焊(han)(han)，它不(bu)僅(jin)保(bao)留熔(rong)化極氬(ya)弧焊(han)(han)的所(suo)有(you)特點，而且能有(you)效(xiao)地控(kong)制熱(re)輸入(ru)，特別使單面焊(han)(han)雙面成(cheng)形變得更容易，在焊(han)(han)接(jie)同樣厚度(du)的不(bu)銹(xiu)鋼鋼板(ban)時，熱(re)輸入(ru)量較非脈(mo)沖熔(rong)化極氬(ya)弧焊(han)(han)小(xiao)，使焊(han)(han)接(jie)熱(re)影(ying)響區變窄，這不(bu)僅(jin)減少(shao)焊(han)(han)接(jie)應力和變形，而且有(you)利于提(ti)高接(jie)頭的耐蝕性。