奧氏(shi)體不銹鋼的縫焊(han)，其焊(han)接(jie)(jie)接(jie)(jie)頭的力學性能、焊(han)接(jie)(jie)質量及(ji)焊(han)接(jie)(jie)條件等，都與點(dian)(dian)焊(han)一(yi)樣。選擇焊(han)接(jie)(jie)條件時(shi)，因為(wei)母(mu)材的高(gao)強度高(gao)，應(ying)采用較高(gao)的電(dian)(dian)(dian)極壓力來抑(yi)制產(chan)生焊(han)接(jie)(jie)缺陷。通(tong)電(dian)(dian)(dian)時(shi)間宜(yi)短，通(tong)電(dian)(dian)(dian)中電(dian)(dian)(dian)極移動距離要(yao)小。通(tong)電(dian)(dian)(dian)時(shi)間短，電(dian)(dian)(dian)流強度就(jiu)要(yao)加(jia)大(da)，電(dian)(dian)(dian)極的消(xiao)耗就(jiu)加(jia)快。若是(shi)(shi)斷(duan)續(xu)通(tong)電(dian)(dian)(dian)，斷(duan)電(dian)(dian)(dian)時(shi)間應(ying)是(shi)(shi)通(tong)電(dian)(dian)(dian)時(shi)間的兩倍以上。若斷(duan)電(dian)(dian)(dian)時(shi)間或者焊(han)接(jie)(jie)速度慢(man)，可(ke)能因為(wei)分(fen)流作(zuo)用，在焊(han)接(jie)(jie)下一(yi)個點(dian)(dian)時(shi)，使前一(yi)個焊(han)點(dian)(dian)再(zai)熔化(hua)，可(ke)能因為(wei)對(dui)該(gai)點(dian)(dian)已經(jing)不受壓力而產(chan)生缺陷。

  要(yao)(yao)想得到致密的(de)(de)縫焊接頭，除應當選用合適的(de)(de)焊接電(dian)(dian)(dian)(dian)(dian)流外(wai)，還要(yao)(yao)調整焊接速(su)度及(ji)通／斷電(dian)(dian)(dian)(dian)(dian)時間。要(yao)(yao)使(shi)焊點(dian)的(de)(de)重復量達到焊點(dian)直(zhi)徑的(de)(de)10%~25%。表3-33所示(shi)為(wei)奧氏體不(bu)銹(xiu)鋼的(de)(de)焊接條件。由于不(bu)銹(xiu)鋼的(de)(de)熱(re)傳導不(bu)良及(ji)電(dian)(dian)(dian)(dian)(dian)阻率較大，所以，連續通電(dian)(dian)(dian)(dian)(dian)比斷續通電(dian)(dian)(dian)(dian)(dian)對母材的(de)(de)熱(re)影響大，變形也大。電(dian)(dian)(dian)(dian)(dian)極材料(liao)適用RWMA的(de)(de)2級(ji)或3級(ji)，電(dian)(dian)(dian)(dian)(dian)極端部要(yao)(yao)平或者梯形。