本文選題：油氣管道　切入點：焊接接頭　出處：《油氣儲運》2017年04期

【摘要】：在油氣管道連頭焊縫及金口焊接過程中,管道強力組對,工況復(fù)雜,存在較大的拘束應(yīng)力,造成金口焊接接頭成為薄弱環(huán)節(jié),易發(fā)生泄漏或開裂。為了提高焊接接頭的斷裂韌性,設(shè)計了自拘束焊接裝置,模擬金口在不同拘束條件下的焊接過程,并對焊接接頭的斷裂韌性CTOD(Crack Tip Opening Displacement)值進行測試和計算。結(jié)果表明:在拘束條件下,焊縫區(qū)的CTOD值與自由狀態(tài)下的CTOD值相差不大;熱影響區(qū)的CTOD值則明顯低于自由狀態(tài)下的CTOD值,且拘束應(yīng)力越大,CTOD值下降越明顯,韌性越差。油氣管道在拘束條件下進行焊接,一定程度上降低了焊接接頭的抗開裂性能,建議在金口焊接時盡量降低拘束應(yīng)力,以減少對焊接接頭斷裂韌性的不利影響。
[Abstract]:In the process of joint weld and gold joint welding of oil and gas pipeline, the working condition of pipeline is complex and there is a large restraint stress, which makes the joint of gold mouth become weak, and it is easy to leak or crack.In order to improve the fracture toughness of welded joints, a self-restraint welding device was designed to simulate the welding process under different restraint conditions. The fracture toughness CTOD(Crack Tip Opening displacementation of welded joints was measured and calculated.The results show that the CTOD value of weld zone is not different from that of CTOD value under free condition, and the CTOD value of heat affected zone is obviously lower than that of CTOD value in free state, and the greater the restraint stress is, the more obvious the decrease of CTOD value is and the worse the toughness is.The cracking resistance of welded joints is reduced to a certain extent by welding of oil and gas pipelines under restraint conditions. It is suggested that the restraint stress should be reduced as far as possible in order to reduce the adverse effect on fracture toughness of welded joints.
【作者單位】： 廣東大鵬液化天然氣有限公司;天津大學(xué)材料學(xué)院;
【基金】：中國海洋石油總公司青年科技創(chuàng)新資助項目“在役陸上長輸天然氣管道含缺陷焊縫適用性評價關(guān)鍵技術(shù)研究”,JZTW2015KJ24
【分類號】：TE973.3

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