Tensile Properties and Microstructure of Weld Metal of X80 Steel by MAG Welding

Motohashi, Hiroyuki; Hagiwara, Naoto; Masuda, Takuro

doi:10.2207/qjjws.22.69

Cited by 3 publications

(3 citation statements)

References 1 publication

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“…However, overmatching is not easy to achieve for high-strength steel pipe. The present authors [7,8] have previously described welding conditions that make overmatching possible, especially when X80 steel pipe is worked, but the range is limited compared to earlier materials. On the other hand, depending on the assumptions for external force conditions and fault dimensions, there are cases in which overmatching is not a requirement.…”

Section: Introductionmentioning

confidence: 99%

Study on ductile crack initiation limit from notch root of pipeline girth welded joints with strength mismatch

Motohashi

Yatabe

2012

Welding International

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This study investigated ductile crack initiation limit of pipeline girth welded joints with different strength mismatches. The ductile crack initiation limit for the girth welded joints was evaluated by conducting three-point bending fracture toughness tests and wide plate tensile tests with a surface notch. In addition, effect of heat input on the ductile crack initiation limit of weld metal (WM) was evaluated on the assumption that a welding condition would be varied in the field in the actual pipeline construction. As the results, the equivalent plastic strain at the notch tip for the ductile crack initiation of the threepoint bending tests was consistent with those of the wide plate tests, and the heat input hardly affected the ductile crack initiation limit within the range of this study. This meant that the ductile crack initiation limit of the pipeline girth welded joints with strength mis-match was able to be estimated using the equivalent plastic strain obtained from the three-point bending tests. Based on these results, we proposed a procedure to determine the rational fracture toughness requirements which took into account the difference in the plastic constraint between standard fracture toughness test and pipeline girth welded joints. This procedure was also possible to determine the required strength matching level for a strain-based design for girth welded joint containing surface notch in the centre of the WM in terms of preventing the ductile crack initiation.

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Section: Introductionmentioning

confidence: 99%

Study on ductile crack initiation limit from notch root of pipeline girth welded joints with strength mismatch

Motohashi

Yatabe

2012

Welding International

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“…S-A by GMAW [7] S-B by GMAW [7] E-B by SMAW ER110S-1 by SAW [14] S-A by GMAW [7] S-B by GMAW [7] E-B by SMAW S-A by GMAW [7] S-B by GMAW [7] E-B by SMAW Fig. 19 Relationship between yield stress of weld metal and acicular ferrite lath width.…”

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confidence: 99%

“…19 Relationship between yield stress of weld metal and acicular ferrite lath width. S-A by GMAW on plate [7] S-B by GMAW on plate [7] E-B by SMAW Equation …”

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Effect of Heat Input on Mechanical Properties and Microstructure of Gas Metal Arc and Shielded Metal Arc Girth Weld Metal of X80 Line Pipe

Motohashi¹,

Hagiwara²

2006

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY

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This study evaluated the weld joint performance of X80 line pipes welded using fully automatic Gas Metal Arc Welding and manual Shielded Metal Arc Welding in order to clarify welding conditions for yield stress overmatching with adequate fracture toughness and hardness taking into account the distribution of the yield stress of line pipes. In addition, we conducted metallurgical surveys of the weld metal to clarify factors dominating the yield stress of the weld metal.The results clarified that the welding conditions applicable to X80 line pipes were the heat input range of between 0.9 and 1.3 kJ/mm using solid wires classified as YGW24 and ER100S-G for GMAW and that of between 1.6 and 2.4 kJ/mm using electrode classified as E11016-G for SMAW. The metallurgical surveys revealed that the yield stress of the weld metal was dependent on the acicular ferrite lath width and percentage of the grain boundary ferrite, ferrite side plate and acicular ferrite. The heat input dependency of the yield stress of the weld metal could be explained from the viewpoint of the acicular ferrite lath width which was the main microstructure.

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Evaluation Method of Pipe Wear for Development of Seafloor Massive Sulfides

2020

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The evaluation of pipe wear is necessary to design the mining system for development of seafloor massive sulfides. The authors conducted three types of the flow loop wear experiment to obtain the basic data of pipe wear during slurry transport. In these experiments, the characteristics of pipe wear for different inner materials and pipe inclinations were investigated. As a result of the experiments, the wear resistance of SUS304 was shown to be higher than those of plastic and rubber materials, and the wear volume of pipe inclined at 30 degrees was largest in the experiment. Then the influence of solid degradation on the wear rates was also investigated. The authors estimated the wall thickness reduction for the lifting pipe based on the results of the flow loop wear experiments. The estimation results showed that it took 89 days to reduce wall thickness by 1mm for a rigid riser made of SUS304.

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Tensile Properties and Microstructure of Weld Metal of X80 Steel by MAG Welding

Cited by 3 publications

References 1 publication

Study on ductile crack initiation limit from notch root of pipeline girth welded joints with strength mismatch

Study on ductile crack initiation limit from notch root of pipeline girth welded joints with strength mismatch

Effect of Heat Input on Mechanical Properties and Microstructure of Gas Metal Arc and Shielded Metal Arc Girth Weld Metal of X80 Line Pipe

Evaluation Method of Pipe Wear for Development of Seafloor Massive Sulfides

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