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    埋弧焊鋼管焊縫余高的控制

    Control of Weld Bead Remaining-height of SSAW Pipe

    • 摘要: 主要闡述了控制輸送用鋼管埋弧焊內(nèi)、外焊縫余高的重要性。焊縫的余高大,則焊縫的應(yīng)力集中系數(shù)大,容易形成應(yīng)力腐蝕裂紋。外焊縫余高大,不利于防腐;內(nèi)焊縫余高大,將會(huì)增加輸送介質(zhì)的能源損失等。重點(diǎn)介紹了螺旋埋弧焊管內(nèi)焊縫易出現(xiàn)的“馬鞍形”問題?！榜R鞍形”內(nèi)焊縫在焊趾處的應(yīng)力相當(dāng)大,這對(duì)用于輸送腐蝕性介質(zhì)的鋼管是最有害的。為了延長(zhǎng)鋼管的服役年限,必須對(duì)焊縫余高進(jìn)行有效的控制。結(jié)合生產(chǎn)實(shí)際,提出了輸送用鋼管埋弧焊焊縫余高的控制措施。

       

      Abstract: Elaborated is the importance of controlling both inner and outer weld bread remaining-height of the SSAW linepipe.The bigger the weld bread remaining-height is,the bigger the weld stress concentration factor will be,thus the easier for the stress corrosion crack to develop.Big outer weld bread remaining-height will reduce corrosion prevention effectiveness,while big weld bread remaining-height will bring about more energy loss of the transport medium.The paper focuses on the problem of the so-called "saddle-shaped" inner weld bread of the SSAW pipe,emphasizing that at the foot of such kind of weld bread,the stress is enormously big,which is harmful to the pipe for transporting corrosive medium.To prolong the service life of the steel linepipe,it is necessary to properly control the said weld bread remaining-height.Based on relevant production practice,measures for control of the weld bread remaining-height of SSAW linepipe are proposed.

       

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