R ＆ D and Application of MK65HGX-Ⅲ Welding Wire for SAW Process
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摘要: 介绍了用于焊接深海天然气输送用直缝埋弧焊管的焊丝MK65HGX-Ⅲ的开发背景及研制过程。采用该焊丝和优化的H08DG焊丝与高碱度烧结焊剂SJ102G匹配焊接11.525万tX65钢级厚壁管线管,其低温韧性、断裂韧性和焊接接头的横向拉伸性能均符合标准要求,且性能稳定,富余量较大。实际生产证明:MK65HGX-Ⅲ焊丝是一种高性能的新型埋弧焊焊丝,所焊接的钢管焊缝具有高强度、高韧性和高塑性,适用于大线能量(约65kJ/cm)的焊接,可推广应用到更高钢级(X80)和抗H2S腐蚀要求的焊管焊接。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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