奧氏(shi)體不銹(xiu)鋼的縫焊(han)(han)，其焊(han)(han)接(jie)(jie)(jie)接(jie)(jie)(jie)頭的力學(xue)性能、焊(han)(han)接(jie)(jie)(jie)質量及焊(han)(han)接(jie)(jie)(jie)條(tiao)件(jian)等，都與點(dian)焊(han)(han)一(yi)樣。選擇焊(han)(han)接(jie)(jie)(jie)條(tiao)件(jian)時(shi)，因為(wei)母材的高(gao)(gao)強度(du)高(gao)(gao)，應采用較高(gao)(gao)的電(dian)(dian)(dian)(dian)極(ji)(ji)壓(ya)力來抑(yi)制產生焊(han)(han)接(jie)(jie)(jie)缺陷。通(tong)(tong)電(dian)(dian)(dian)(dian)時(shi)間(jian)(jian)宜短，通(tong)(tong)電(dian)(dian)(dian)(dian)中(zhong)電(dian)(dian)(dian)(dian)極(ji)(ji)移動距離要小。通(tong)(tong)電(dian)(dian)(dian)(dian)時(shi)間(jian)(jian)短，電(dian)(dian)(dian)(dian)流強度(du)就(jiu)要加(jia)(jia)大，電(dian)(dian)(dian)(dian)極(ji)(ji)的消耗就(jiu)加(jia)(jia)快(kuai)。若是斷續(xu)通(tong)(tong)電(dian)(dian)(dian)(dian)，斷電(dian)(dian)(dian)(dian)時(shi)間(jian)(jian)應是通(tong)(tong)電(dian)(dian)(dian)(dian)時(shi)間(jian)(jian)的兩倍以上(shang)。若斷電(dian)(dian)(dian)(dian)時(shi)間(jian)(jian)或者焊(han)(han)接(jie)(jie)(jie)速(su)度(du)慢，可(ke)能因為(wei)分流作用，在焊(han)(han)接(jie)(jie)(jie)下一(yi)個點(dian)時(shi)，使前(qian)一(yi)個焊(han)(han)點(dian)再(zai)熔(rong)化，可(ke)能因為(wei)對該(gai)點(dian)已經(jing)不受(shou)壓(ya)力而產生缺陷。

  要(yao)(yao)想得(de)到(dao)致(zhi)密的(de)縫(feng)焊(han)接頭，除(chu)應當(dang)選(xuan)用合適的(de)焊(han)接電(dian)(dian)流(liu)外，還要(yao)(yao)調整焊(han)接速度及通(tong)／斷電(dian)(dian)時間。要(yao)(yao)使焊(han)點的(de)重復量達到(dao)焊(han)點直徑的(de)10%~25%。表3-33所(suo)示為奧氏體(ti)不(bu)銹鋼(gang)的(de)焊(han)接條件。由(you)于不(bu)銹鋼(gang)的(de)熱(re)傳(chuan)導不(bu)良及電(dian)(dian)阻率較(jiao)大(da)，所(suo)以，連續(xu)通(tong)電(dian)(dian)比斷續(xu)通(tong)電(dian)(dian)對母(mu)材的(de)熱(re)影(ying)響大(da)，變形(xing)也大(da)。電(dian)(dian)極材料(liao)適用RWMA的(de)2級(ji)或3級(ji)，電(dian)(dian)極端部要(yao)(yao)平或者(zhe)梯形(xing)。