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    埋弧焊焊絲MK65HGX-Ⅲ的開發(fā)和應(yīng)用

    R ＆ D and Application of MK65HGX-Ⅲ Welding Wire for SAW Process

    • 摘要: 介紹了用于焊接深海天然氣輸送用直縫埋弧焊管的焊絲MK65HGX-Ⅲ的開發(fā)背景及研制過程。采用該焊絲和優(yōu)化的H08DG焊絲與高堿度燒結(jié)焊劑SJ102G匹配焊接11.525萬tX65鋼級厚壁管線管,其低溫韌性、斷裂韌性和焊接接頭的橫向拉伸性能均符合標(biāo)準(zhǔn)要求,且性能穩(wěn)定,富余量較大。實(shí)際生產(chǎn)證明:MK65HGX-Ⅲ焊絲是一種高性能的新型埋弧焊焊絲,所焊接的鋼管焊縫具有高強(qiáng)度、高韌性和高塑性,適用于大線能量(約65kJ/cm)的焊接,可推廣應(yīng)用到更高鋼級(X80)和抗H2S腐蝕要求的焊管焊接。

       

      Abstract: Elaborated in the paper are the development background and the R & D activities of the MK65HGX-Ⅲ welding wire for making of the SAWL pipe for deep ocean pipeline service. 115, 250 tons of X65 heavy-wall linepipes have been made by the welding process employing the said welding wire and the optimized H08DG welding wire together with the SJ102G high-basicity sintered agent. The linepipes are in compliance with applicable standard in terms of low temperature toughness,rupture toughness and weld joint transversal tensile strength,and also have stable performance,and rather large allowance. Relevant operation practice demonstrates that as a new type hi-performance welding wire for SAW process,the MK65HGX-Ⅲ welding wire is capable of making steel pipes with high strength,high toughness and high plasticity,being suitable for welding operation with a large linear energy(approximately 65 kJ/cm),and worth spreading for welding pipes in higher steel grades(e.g.,X80),and pipes as required for proper H2S corrosion resistance.

       

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