通过几何尺寸检测、射线检测、化学成分分析、力学性能检测、宏观微观组织分析等方法,对某φ660 mm X70钢级输气管道环焊缝裂纹产生原因进行了分析。结果表明:裂纹产生于环焊缝6点钟附近,环焊缝焊趾部位存在的未熔合缺陷是裂纹产生的根...通过几何尺寸检测、射线检测、化学成分分析、力学性能检测、宏观微观组织分析等方法,对某φ660 mm X70钢级输气管道环焊缝裂纹产生原因进行了分析。结果表明:裂纹产生于环焊缝6点钟附近,环焊缝焊趾部位存在的未熔合缺陷是裂纹产生的根本原因。在附加应力的作用下,裂纹沿着根焊和填充焊金属中的孔洞和焊渣发生了进一步扩展开裂。展开更多
This paper contributes about the behaviour of Acoustic Emission (AE) signatures of implanted weld defects of SS 316L materials. Lack of penetration and lack of side fusion defects were implanted in weld bead region of...This paper contributes about the behaviour of Acoustic Emission (AE) signatures of implanted weld defects of SS 316L materials. Lack of penetration and lack of side fusion defects were implanted in weld bead region of the materials. Tungsten Inert Gas Welding (TIG) is adopted to weld the Stainless Steel (SS316L) nuclear grade materials. The material is fabricated with dimensions of 140 × 16 × 10 mm and AE signatures are studied under preload conditions. Mechanical Jig is fabricated to maintain constant load in concentrated weld region. When external load is applied on the weld region, the deformed specimen experiences acoustic emission signals form the weld defect region which are potential source of releasing stress energy. Liner Location Technique (LLT) is adopted for AE singal studies and the generated signal is processed by 2-channel USB—AE node and AE-WIN software. The tests are conducted on two different samples having each defect. A conventional NDT method i.e. X-ray Radiography is conducted on the samples to know the defect ranging and correlated with AE signatures. This study will be helpful to standardize the AE signals for different implanted weld defects of SS 316L materials and it is found that, the parameter “counts vs. amplitude” has given the widest distinction with respect to the type of defects.展开更多
文摘通过几何尺寸检测、射线检测、化学成分分析、力学性能检测、宏观微观组织分析等方法,对某φ660 mm X70钢级输气管道环焊缝裂纹产生原因进行了分析。结果表明:裂纹产生于环焊缝6点钟附近,环焊缝焊趾部位存在的未熔合缺陷是裂纹产生的根本原因。在附加应力的作用下,裂纹沿着根焊和填充焊金属中的孔洞和焊渣发生了进一步扩展开裂。
文摘This paper contributes about the behaviour of Acoustic Emission (AE) signatures of implanted weld defects of SS 316L materials. Lack of penetration and lack of side fusion defects were implanted in weld bead region of the materials. Tungsten Inert Gas Welding (TIG) is adopted to weld the Stainless Steel (SS316L) nuclear grade materials. The material is fabricated with dimensions of 140 × 16 × 10 mm and AE signatures are studied under preload conditions. Mechanical Jig is fabricated to maintain constant load in concentrated weld region. When external load is applied on the weld region, the deformed specimen experiences acoustic emission signals form the weld defect region which are potential source of releasing stress energy. Liner Location Technique (LLT) is adopted for AE singal studies and the generated signal is processed by 2-channel USB—AE node and AE-WIN software. The tests are conducted on two different samples having each defect. A conventional NDT method i.e. X-ray Radiography is conducted on the samples to know the defect ranging and correlated with AE signatures. This study will be helpful to standardize the AE signals for different implanted weld defects of SS 316L materials and it is found that, the parameter “counts vs. amplitude” has given the widest distinction with respect to the type of defects.
