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- W3198743670 abstract "This study aims to investigate the root cause of a failure in an ASTM A106 pipe-ASTM A105 flange welded joint, welded to a pump in an ammonia plant. Samples were taken from the failed joint. These joints were exposed to steam at the temperature of 148 °C and internal pressure of 7 bar. The changes in metal microstructures along the welded metal showed that root pass region consists of large grain-size structure, containing Widmanstätten, grain boundary and polygonal ferrite structures. On the other hand, the areas on the middle and upper sections of the weld mostly contained acicular ferrites. The results of hardness tests indicated that the root pass region has lower hardness compared to other areas which is due to large grain size structure in this region. In addition, simulation results showed that a rather large residual tensile stress exists at the root of the weldment. Besides, results of fractography showed that areas close to the weld root consisted of a quasi-cleavage structure. Based on the results, it can be postulated that the main reason for the failure was unsuitable welding parameters which have resulted in the formation of large grain structures with low strength." @default.
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- W3198743670 date "2021-11-01" @default.
- W3198743670 modified "2023-10-16" @default.
- W3198743670 title "Root cause analysis of a failure in a flange-pipe welded joint in a steam line in an ammonia plant: Experimental investigation and simulation assessment" @default.
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- W3198743670 doi "https://doi.org/10.1016/j.engfailanal.2021.105730" @default.
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