奧氏體(ti)不(bu)(bu)銹鋼的(de)縫(feng)焊(han)(han)(han)，其焊(han)(han)(han)接(jie)(jie)接(jie)(jie)頭的(de)力(li)(li)學性能(neng)(neng)、焊(han)(han)(han)接(jie)(jie)質量及(ji)焊(han)(han)(han)接(jie)(jie)條(tiao)件等，都與點焊(han)(han)(han)一(yi)樣(yang)。選擇焊(han)(han)(han)接(jie)(jie)條(tiao)件時(shi)，因(yin)為母材(cai)的(de)高(gao)強度(du)高(gao)，應采用較高(gao)的(de)電(dian)(dian)極壓(ya)力(li)(li)來抑制產生焊(han)(han)(han)接(jie)(jie)缺(que)陷。通電(dian)(dian)時(shi)間(jian)(jian)宜短，通電(dian)(dian)中電(dian)(dian)極移動(dong)距(ju)離要小(xiao)。通電(dian)(dian)時(shi)間(jian)(jian)短，電(dian)(dian)流(liu)強度(du)就(jiu)要加大，電(dian)(dian)極的(de)消耗(hao)就(jiu)加快。若(ruo)是斷(duan)續通電(dian)(dian)，斷(duan)電(dian)(dian)時(shi)間(jian)(jian)應是通電(dian)(dian)時(shi)間(jian)(jian)的(de)兩(liang)倍以上。若(ruo)斷(duan)電(dian)(dian)時(shi)間(jian)(jian)或者焊(han)(han)(han)接(jie)(jie)速(su)度(du)慢，可能(neng)(neng)因(yin)為分流(liu)作用，在焊(han)(han)(han)接(jie)(jie)下一(yi)個點時(shi)，使前一(yi)個焊(han)(han)(han)點再熔化，可能(neng)(neng)因(yin)為對該點已經不(bu)(bu)受壓(ya)力(li)(li)而(er)產生缺(que)陷。

  要(yao)想得到致密的(de)縫焊(han)(han)接(jie)(jie)頭，除應當選用合適的(de)焊(han)(han)接(jie)(jie)電(dian)(dian)流外(wai)，還要(yao)調整焊(han)(han)接(jie)(jie)速(su)度及通(tong)／斷(duan)電(dian)(dian)時間。要(yao)使焊(han)(han)點(dian)的(de)重復量(liang)達到焊(han)(han)點(dian)直徑的(de)10%~25%。表3-33所示(shi)為奧氏體(ti)不銹(xiu)鋼(gang)的(de)焊(han)(han)接(jie)(jie)條件(jian)。由于不銹(xiu)鋼(gang)的(de)熱(re)傳導不良及電(dian)(dian)阻率較大，所以，連續通(tong)電(dian)(dian)比(bi)斷(duan)續通(tong)電(dian)(dian)對(dui)母材的(de)熱(re)影(ying)響大，變形(xing)也大。電(dian)(dian)極材料適用RWMA的(de)2級或(huo)3級，電(dian)(dian)極端部要(yao)平或(huo)者梯形(xing)。