奧(ao)氏(shi)體不銹鋼的(de)縫焊(han)(han)，其焊(han)(han)接(jie)(jie)接(jie)(jie)頭(tou)的(de)力(li)學性(xing)能、焊(han)(han)接(jie)(jie)質(zhi)量及焊(han)(han)接(jie)(jie)條件(jian)等，都與點(dian)(dian)焊(han)(han)一(yi)(yi)樣。選擇(ze)焊(han)(han)接(jie)(jie)條件(jian)時，因為母材的(de)高(gao)強(qiang)度(du)高(gao)，應(ying)采用較(jiao)高(gao)的(de)電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)壓力(li)來(lai)抑制產生焊(han)(han)接(jie)(jie)缺陷。通(tong)電(dian)(dian)(dian)(dian)(dian)時間宜(yi)短，通(tong)電(dian)(dian)(dian)(dian)(dian)中電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)移(yi)動距離要小(xiao)。通(tong)電(dian)(dian)(dian)(dian)(dian)時間短，電(dian)(dian)(dian)(dian)(dian)流(liu)強(qiang)度(du)就要加(jia)大(da)，電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)的(de)消(xiao)耗(hao)就加(jia)快。若(ruo)是斷續通(tong)電(dian)(dian)(dian)(dian)(dian)，斷電(dian)(dian)(dian)(dian)(dian)時間應(ying)是通(tong)電(dian)(dian)(dian)(dian)(dian)時間的(de)兩(liang)倍以(yi)上。若(ruo)斷電(dian)(dian)(dian)(dian)(dian)時間或者焊(han)(han)接(jie)(jie)速度(du)慢(man)，可能因為分(fen)流(liu)作(zuo)用，在焊(han)(han)接(jie)(jie)下一(yi)(yi)個(ge)點(dian)(dian)時，使前一(yi)(yi)個(ge)焊(han)(han)點(dian)(dian)再熔化(hua)，可能因為對該點(dian)(dian)已(yi)經不受(shou)壓力(li)而產生缺陷。

  要(yao)想得到(dao)致密的縫焊(han)接頭，除應當選用(yong)合適(shi)的焊(han)接電(dian)流(liu)外，還要(yao)調(diao)整焊(han)接速(su)度及(ji)通／斷電(dian)時(shi)間。要(yao)使(shi)焊(han)點的重(zhong)復(fu)量達到(dao)焊(han)點直徑的10%~25%。表3-33所示為奧氏體不銹鋼(gang)的焊(han)接條(tiao)件。由于不銹鋼(gang)的熱(re)傳導不良及(ji)電(dian)阻率較大(da)(da)，所以，連續通電(dian)比斷續通電(dian)對母材的熱(re)影(ying)響(xiang)大(da)(da)，變(bian)形也大(da)(da)。電(dian)極(ji)材料適(shi)用(yong)RWMA的2級(ji)或3級(ji)，電(dian)極(ji)端部要(yao)平或者(zhe)梯形。