管(guan)件(jian)的(de)(de)(de)坡口(kou)(kou)形式和尺(chi)寸(cun)應(ying)符合設計文件(jian)規(gui)(gui)定(ding)。當設計文件(jian)無規(gui)(gui)定(ding)時，可執(zhi)行(xing)《現場(chang)設備、工(gong)(gong)(gong)(gong)業管(guan)道焊(han)接工(gong)(gong)(gong)(gong)程施工(gong)(gong)(gong)(gong)及驗收(shou)規(gui)(gui)范》(GB 50236-1998)附表(biao)C中的(de)(de)(de)規(gui)(gui)定(ding)。管(guan)道坡口(kou)(kou)加(jia)工(gong)(gong)(gong)(gong)宜(yi)采(cai)(cai)用(yong)(yong)機(ji)械(xie)方(fang) 法(fa)(fa)，也可采(cai)(cai)用(yong)(yong)等離子弧、氧(yang)一(yi)乙炔焰等熱加(jia)工(gong)(gong)(gong)(gong)方(fang)法(fa)(fa)。采(cai)(cai)用(yong)(yong)熱加(jia)工(gong)(gong)(gong)(gong)方(fang)法(fa)(fa)加(jia)工(gong)(gong)(gong)(gong)坡口(kou)(kou)后，應(ying)除(chu)去坡口(kou)(kou)表(biao) 面(mian)的(de)(de)(de)氧(yang)化皮、熔渣及影(ying)響接頭質(zhi)量(liang)的(de)(de)(de)表(biao)面(mian)層(ceng)，并(bing)應(ying)將凹凸不平(ping)處打磨平(ping)整。SHA級管(guan)道的(de)(de)(de)管(guan)子應(ying) 采(cai)(cai)用(yong)(yong)機(ji)械(xie)方(fang)法(fa)(fa)加(jia)工(gong)(gong)(gong)(gong)。SHB級管(guan)道的(de)(de)(de)管(guan)子，宜(yi)用(yong)(yong)機(ji)械(xie)方(fang)法(fa)(fa)加(jia)工(gong)(gong)(gong)(gong)。當采(cai)(cai)用(yong)(yong)氧(yang)一(yi)乙炔焰或等離子切(qie)割時 ，切(qie)割后必須除(chu)去影(ying)響焊(han)接質(zhi)量(liang)的(de)(de)(de)表(biao)面(mian)層(ceng)。

　　坡口的質量應符(fu)合下列(lie)要求(qiu):

　　(1)表面平整，不得有裂紋、重皮、毛刺、凸凹縮口;
　　(2)切割表面的熔渣、氧化鐵、鐵屑等應予清除;
　　(3)端面傾斜偏差為管子外徑的1%，且不得超過2mm;
　　(4)坡口尺寸和(he)角度應符合要(yao)求。

　　焊接坡(po)口的滲透檢測應符合下列規定(ding):

　　(1)標準抗拉強度的下限值，大于或等于540MPa和設計圖樣規定100%檢測的焊接坡口，應全部檢測;
　　(2)設計溫度低于或等于-29℃的非(fei)奧氏(shi)體不(bu)銹鋼(gang)管道坡(po)口(kou)應抽檢5%。