چکیده مقاله
This study investigates the causes of failure in mobile casing pipes, focusing on pitting corrosion and its impact on the welded areas The results from microscopic analyses and mechanical tests indicate that pitting corrosion, particularly in the weld region, is the primary factor responsible for the reduction in strength and the initiation of fatigue cracks in the pipes This type of corrosion occurs on the internal surface of the pipes, especially in the welded regions, under the influence of factors such as chloride ions, carbon dioxide CO₂ , and other corrosive pollutants Pitting corrosion leads to a reduction in the pipe thickness and the concentration of localized stresses in the damaged areas, which can accelerate the fatigue process and eventually cause pipe failure Microscopic examination of the fracture surface, including Scanning Electron Microscopy SEM , revealed that cracks typically originate from corroded areas and gradually propagate along the pipe The weld region is particularly vulnerable to pitting corrosion due to structural inhomogeneity and the presence of residual stresses, often acting as the primary weak point in mobile casing pipes Based on the obtained results, the use of protective methods such as coating, selection of corrosion resistant materials, optimization of welding processes, and control of residual stresses can effectively prevent failures due to corrosion and fatigue, thus extending the service life of the pipes
کلیدواژه‌ها
نویسندگان
Hassan Ghiasi
Assistant Professor, Metallurgical Engineering, Research Institute of Technology Development,Sharif University of Technology, Iran,
Alireza Sartibi
Master's Student, Materials Selection and Identification Engineering, K N Toosi University ofTechnology, Tehran, Iran,
شیوه ارجاع
Ghiasi, Hassan and Sartibi, Alireza,1403,Analysis of the Failure of a Coiled Tubing under the Influence of Pitting Corrosion and Fatigue at the Weld Zone,7th International Conference on Welding and Non Destructive Testing & 25th National Conference on Welding & Inspection & 14th National Conference on NDT & 3nd National Conference on Additive Manufacturing,Tehran
ارائه‌شده در
مجموعه مقالات هفتمین کنفرانس بین المللی جوشکاری وغیرمخرب، بیست و پنجمین کنفرانس ملی جوش و بازرسی، چهاردهمین کنفرانس ملی آزمایش های غیرمخرب و سومین کنفرانس ملی ساخت افزایشی1 اسفند 1403 · تهران