L245/S30403直縫復(fù)合管焊接工藝研究
Research on Welding Process for L245/S30403 Straight Clad Pipe
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摘要: 分析了影響復(fù)合管焊接接頭耐腐蝕性能的因素。以Φ508 mm×（8+2）mm×6 000 mm、L245/S30403直縫復(fù)合管為例，介紹了直縫復(fù)合管焊接方法、焊材選擇、焊接坡口設(shè)計(jì)及參數(shù)設(shè)計(jì)，并分析其金相組織，檢測(cè)其性能。分析認(rèn)為：過渡層、熔合比、晶間腐蝕及δ鐵素體含量對(duì)復(fù)合管焊接接頭耐腐蝕性能影響較大；通過控制焊接熱輸入來降低熔合比是焊接直縫復(fù)合管的原則；因基層與復(fù)層的彈性模量不同，直縫復(fù)合管應(yīng)謹(jǐn)慎使用擴(kuò)徑工藝，宜采用時(shí)效或機(jī)械的方式消除應(yīng)力。Abstract: Investigated in the article are the factors affecting corrosion resistance of the clad pipe weld joint.Taking manufacture of the Φ508 mm×（8+2）mm×6 000 mm L245/S30403 straight weld clad pipe as an example，the main aspects concerning production of the straight clad pipe are detailed， including welding method， welding material selection，design of the welding bevel type and relevant parameters，and metallographic structure analysis and property testing of the finalized pipe.The result of the analysis reveals that the major factors affecting corrosion resistance of the clad pipe weld joint include transitional layer， penetration ratio， intergranular corrosion， and content of δ ferrite.Therefore to reduce the penetration ratio via proper control of heat input is the primary principle for welding the straight clad pipe.And furthermore，due to the difference of plastic modules between the base layer and the clad layer，in case of making the clad pipe with the expanding process，great care has to be taken，while proper stress-release methods like aging or mechanical process should be adopted.
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