scholarly journals Effect of Load Ratio on the Mechanical Field around Crack Front of Dissimilar Metal Weld Joints

Author(s):  
Jia Wenna ◽  
Zhao Lingyan ◽  
He Jinxuan ◽  
Rehmat Bashir
2017 ◽  
Vol 741 ◽  
pp. 134-137
Author(s):  
Lubomír Junek ◽  
Ladislav Jurasek ◽  
Zdeněk Čančura ◽  
Miroslava Ernestová ◽  
Zuzana Skoumalová

Indications were detected on dissimilar metal welds (DMW) of steam generators (SG) after 20 years of operation during NDT inspections. Indications started slowly growth every year. DMW on SGs had to be repaired. Paper describes experimental analysis and degradation mechanism of SG weld joints failures.


2015 ◽  
Vol 459 ◽  
pp. 5-12 ◽  
Author(s):  
Seung Chang Yoo ◽  
Kyoung Joon Choi ◽  
Chi Bum Bahn ◽  
Si Hoon Kim ◽  
Ju Young Kim ◽  
...  

2019 ◽  
Vol 8 (4) ◽  
pp. 20180139
Author(s):  
L. Zamora Rangel ◽  
J. A. Aguilar Torres ◽  
A. R. Sandoval ◽  
C. R. Arganis Juárez ◽  
L. Díaz Pérez ◽  
...  

2017 ◽  
Vol 688 ◽  
pp. 396-406 ◽  
Author(s):  
Javed Akram ◽  
Prasad Rao Kalvala ◽  
Mano Misra ◽  
Indrajit Charit

2016 ◽  
Vol 6 (3) ◽  
pp. 248-261
Author(s):  
J. C. I. Ramírez-Soto ◽  
J. M. Salgado-López ◽  
J. T. Pérez-Quiroz ◽  
T. Pérez-López ◽  
J. Terán-Guillén ◽  
...  

Efecto del mantequillado en las propiedades mecánicas de uniones soldadas disímiles en barras de refuerzo para estructuras de concreto RESUMENEn este trabajo se ha investigado la influencia de utilizar Inconel 182 como material de “mantequillado” en las propiedades mecánicas de uniones disimiles acero al carbono-inoxidable manufacturadas por soldadura con electrodo recubierto. Para ello se han empleado las siguientes técnicas: análisis microestructural, ensayos de microdureza Vickers y ensayos mecánicos de tensión. Se ha empleado el proceso de soldadura con electrodo recubierto por que es el más común en la soldadura de campo para la construcción. Los resultados demuestran que aun cuando las uniones disimiles sin “mantequillado” presentan defectos, sus propiedades mecánicas son superiores a las de las uniones soldadas con “mantequillado”. Esta metodología es propuesta para la rehabilitación de estructuras de concreto para ambiente marino con barras de acero como refuerzos.Palabras clave: mantequillado; uniones soldadas con materiales disimiles; propiedades mecánicas; microestructura; defectos. Effect of buttering in mechanical properties of dissimilar metal weld joints for reinforcement bars in concrete structures ABSTRACTIn this work, the influence of Inconel 182 as buttering material in the mechanical properties of dissimilar metal welds between plain carbon steel and stainless steel bars welded using SMAW has been investigated using microstructural analysis, Vickers microhardness testing, and tensile tests. Welding with SMAW process is commonly applied in field welding of concrete structures; therefore this process was selected for this work. The results indicated that even if the joints contain defects generated by the welder, the mechanical properties of dissimilar welded joint without buttering are higher than the properties of joints with buttering. This methodology is proposed for the rehabilitation of concrete structures with steel bars as reinforcements, which are located in marine enviroments.  Keywords: buttering, dissimilar metal weld joints; mechanical properties; microstructure; defects. Efeito da introdução de um terceiro material sobre as propriedades mecânicas das juntas soldadas entre aço carbono e aço inox, em barras de aço para estruturas de concreto RESUMOEste artigo investiga a influência da utilização de Inconel 182 como um terceiro material, nas propriedades mecânicas de diferentes aços inoxidáveis soldados a aços carbono com uso de eletrodo revestido. Para tanto foram usados os seguintes métodos: análise microestrutural, ensaios de microdureza Vickers e ensaios mecânicos de tensão. Tem sido empregado o processo de solda com eletrodo revestido, porque é o mais comum no campo de solda para a construção. Os resultados mostram que quando as uniões são realizadas sem esse terceiro material, as propriedades mecânicas são superiores às das juntas soldadas com auxílio do Inconel 182. Esta metodologia, ora criticada, tem sido proposta para a reabilitação de estruturas de concreto em ambiente marinho, com uso de barras de aço inox como reforços.Palavras-chave: juntas soldadas com materiais diferentes; propriedades mecânicas; microestrutura; defeitos.


Author(s):  
S. F. Hankinson ◽  
T. Hayashi ◽  
C. K. Ng ◽  
S. A. Swamy

The Boiling Water Reactor (BWR) shroud support dissimilar metal (DM) joints, which are made of Alloy182 nickel based alloy weld material, are susceptible to Intergranular Stress Corrosion Cracking (IGSCC). IGSCC of these weld joints is an industry wide issue that is receiving constant attention from both power plant operators and regulatory agencies. Crack growth due to IGSCC in the shroud support DM weld joints is typically evaluated based on conventional idealized crack shape instead of natural crack shape dictated by the crack tip stress intensity factors calculated along the entire crack front. Due to the complexity in the geometry and stress field at these weld joints, the use of natural crack shape as the crack propagates would provide a more realistic assessment of crack growth and structural integrity of the shroud support dissimilar metal weld joints. This paper describes the simulation of natural crack growth due to IGSCC in the shroud support DM weld joints through the use of advanced finite element fracture mechanics techniques. Typical normal operating stresses including welding residual stresses at these weld joints were considered in the IGSCC crack growth simulation. A comparison of the crack growth results between the use of idealized and natural crack shape was made to assess the impact on the structural integrity of the BWR shroud support DM weld joints.


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