隨著城市建設的快速發展和(he)供(gong)(gong)熱(re)需求(qiu)的壓力，直埋供(gong)(gong)熱(re)管(guan)道檢(jian)測的重要(yao)性(xing)日益增加(jia)。由于采用埋地管(guan)道，一旦發生泄漏，維修困難，特別是(shi)在城市中，將對城市的外(wai)觀和(he)交通(tong)產生重大(da)影響。因此，直埋供(gong)(gong)熱(re)管(guan)道焊接接頭的質量控制(zhi)尤為重要(yao)。

無損檢(jian)(jian)(jian)(jian)(jian)(jian)(jian)測(ce)(ce)(ce)在焊(han)接接頭(tou)的(de)(de)(de)(de)(de)質量(liang)控制中起著(zhu)至關(guan)重要的(de)(de)(de)(de)(de)作用。目(mu)前建筑施工(gong)中常用的(de)(de)(de)(de)(de)無損檢(jian)(jian)(jian)(jian)(jian)(jian)(jian)測(ce)(ce)(ce)技(ji)術有(you)四種(zhong)，即射線檢(jian)(jian)(jian)(jian)(jian)(jian)(jian)測(ce)(ce)(ce)、超(chao)聲檢(jian)(jian)(jian)(jian)(jian)(jian)(jian)測(ce)(ce)(ce)、磁粉檢(jian)(jian)(jian)(jian)(jian)(jian)(jian)測(ce)(ce)(ce)和(he)侵徹檢(jian)(jian)(jian)(jian)(jian)(jian)(jian)測(ce)(ce)(ce)。在直埋供熱(re)管道的(de)(de)(de)(de)(de)焊(han)縫(feng)(feng)檢(jian)(jian)(jian)(jian)(jian)(jian)(jian)測(ce)(ce)(ce)中，要綜合(he)考慮焊(han)縫(feng)(feng)結(jie)構、位置、各檢(jian)(jian)(jian)(jian)(jian)(jian)(jian)測(ce)(ce)(ce)技(ji)術的(de)(de)(de)(de)(de)特點，同時還要考慮對施工(gong)周期(qi)和(he)成(cheng)本的(de)(de)(de)(de)(de)影(ying)響。在四種(zhong)檢(jian)(jian)(jian)(jian)(jian)(jian)(jian)測(ce)(ce)(ce)方法(fa)中，磁粉和(he)滲透檢(jian)(jian)(jian)(jian)(jian)(jian)(jian)測(ce)(ce)(ce)只能檢(jian)(jian)(jian)(jian)(jian)(jian)(jian)測(ce)(ce)(ce)焊(han)縫(feng)(feng)的(de)(de)(de)(de)(de)表(biao)面(mian)和(he)近表(biao)面(mian)缺陷，不能檢(jian)(jian)(jian)(jian)(jian)(jian)(jian)測(ce)(ce)(ce)焊(han)縫(feng)(feng)的(de)(de)(de)(de)(de)內部缺陷。因此(ci)，供熱(re)管道焊(han)縫(feng)(feng)檢(jian)(jian)(jian)(jian)(jian)(jian)(jian)測(ce)(ce)(ce)中常用的(de)(de)(de)(de)(de)檢(jian)(jian)(jian)(jian)(jian)(jian)(jian)測(ce)(ce)(ce)方法(fa)有(you)射線探傷和(he)超(chao)聲波探傷。*后來，我(wo)們重點研(yan)究了(le)直埋供熱(re)管道(dao)的超聲波探(tan)傷，并將其與射線探(tan)傷復檢等無損檢測(ce)方法相(xiang)結合(he)，以保證管道(dao)焊接(jie)質量。

影(ying)響(xiang)無損檢(jian)(jian)測(ce)選擇的因素是由(you)于(yu)輻射危害(hai)大。在(zai)進(jin)行(xing)檢(jian)(jian)測(ce)時(shi)，必須設置隔離區(qu)，防(fang)止(zhi)非(fei)檢(jian)(jian)測(ce)人(ren)員進(jin)入，特別(bie)是在(zai)舊城(cheng)區(qu)供熱管網(wang)改造(zao)階段(duan)。施(shi)工(gong)(gong)區(qu)域位于(yu)市中心，人(ren)流(liu)密集，給施(shi)工(gong)(gong)安全(quan)管理帶來很大壓力。同時(shi)，由(you)于(yu)射線(xian)檢(jian)(jian)測(ce)持續時(shi)間長，往往會影(ying)響(xiang)后續施(shi)工(gong)(gong)，導致工(gong)(gong)作(zuo)延誤。超(chao)聲(sheng)波檢(jian)(jian)測(ce)由(you)于(yu)其(qi)檢(jian)(jian)測(ce)速度(du)快、靈敏度(du)高、攜帶方便、操作(zuo)方便，對人(ren)體無害(hai)，可(ke)以有效解決上述問題。