奧氏體不銹鋼的縫(feng)焊，其焊接(jie)接(jie)頭的力(li)學性能、焊接(jie)質量及焊接(jie)條件(jian)等，都與點(dian)焊一(yi)樣。選(xuan)擇焊接(jie)條件(jian)時(shi)(shi)，因(yin)為母材的高強(qiang)度(du)(du)(du)高，應(ying)采用較高的電(dian)(dian)(dian)(dian)極(ji)壓(ya)力(li)來(lai)抑制產生(sheng)焊接(jie)缺陷。通(tong)(tong)電(dian)(dian)(dian)(dian)時(shi)(shi)間(jian)(jian)宜(yi)短，通(tong)(tong)電(dian)(dian)(dian)(dian)中電(dian)(dian)(dian)(dian)極(ji)移動距離要(yao)小。通(tong)(tong)電(dian)(dian)(dian)(dian)時(shi)(shi)間(jian)(jian)短，電(dian)(dian)(dian)(dian)流強(qiang)度(du)(du)(du)就要(yao)加大，電(dian)(dian)(dian)(dian)極(ji)的消耗就加快。若是(shi)斷續通(tong)(tong)電(dian)(dian)(dian)(dian)，斷電(dian)(dian)(dian)(dian)時(shi)(shi)間(jian)(jian)應(ying)是(shi)通(tong)(tong)電(dian)(dian)(dian)(dian)時(shi)(shi)間(jian)(jian)的兩倍以上。若斷電(dian)(dian)(dian)(dian)時(shi)(shi)間(jian)(jian)或(huo)者焊接(jie)速度(du)(du)(du)慢，可(ke)能因(yin)為分流作(zuo)用，在焊接(jie)下一(yi)個(ge)點(dian)時(shi)(shi)，使(shi)前一(yi)個(ge)焊點(dian)再熔化，可(ke)能因(yin)為對該(gai)點(dian)已經不受壓(ya)力(li)而產生(sheng)缺陷。

  要想得到致密(mi)的(de)(de)縫焊(han)接(jie)頭，除應(ying)當(dang)選(xuan)用(yong)合適的(de)(de)焊(han)接(jie)電(dian)流外，還(huan)要調整焊(han)接(jie)速度(du)及通(tong)／斷電(dian)時間。要使焊(han)點(dian)的(de)(de)重(zhong)復量達到焊(han)點(dian)直徑的(de)(de)10%~25%。表3-33所示為奧(ao)氏體(ti)不(bu)銹(xiu)鋼(gang)的(de)(de)焊(han)接(jie)條件。由于不(bu)銹(xiu)鋼(gang)的(de)(de)熱傳(chuan)導不(bu)良及電(dian)阻率較大(da)，所以，連續通(tong)電(dian)比斷續通(tong)電(dian)對母材(cai)的(de)(de)熱影響大(da)，變(bian)形也大(da)。電(dian)極材(cai)料適用(yong)RWMA的(de)(de)2級(ji)或(huo)3級(ji)，電(dian)極端部要平或(huo)者梯(ti)形。