執(zhí)行俄羅斯標準的K60管線管JCO焊接工藝實踐

Production Practice of Russian Standard-based Welding Process for K60 Linepipe

摘要: 分析了俄羅斯標準K60管線管母材的焊接性，介紹了K60管線管焊材選擇、焊接坡口設計及焊接方法以及生產(chǎn)檢測結(jié)果。認為：選用堿度值較高的焊劑，注意調(diào)配焊縫金屬中Mn、Si含量，以保證組織中含有較多的針狀鐵素體；焊接熱輸入對K60鋼級管線管焊縫組織影響明顯，隨著焊接熱輸入的增加，柱狀晶比例減小，針狀鐵素體呈先增后減的趨勢。

Abstract: Analyzed is the weldability of the base metal of the Russian standard-based K60 linepipe，and elaborated are the main aspects concerning manufacture thereof，covering determination of welding material，design of the welding bevel，the welding process，and the product inspection results，etc. It is concluded by the coauthors that sufficient acicular ferrites in the structure will be obtained by means of using high basicity weld flux，and properly controlling contents of Mn and Si in the weld seam metal，and that the welding heat input remarkably affects the weld seam structure of the K60 linepipe，i.e.，along with increase of the welding heat input，proportion of the columnar crystal is reduced，while acicular ferrite is first increased，and then gradually decreased.