Bead-on-Plate Underwater Wet Welding on S700MC Steel

In this paper, the application possibilities of the ultra-high strength (UHSS) Domex 960 steel in the underwater welded structures are analyzed. In the research, the investigated material has been tested in bead-on-plate wet welding conditions with the usage of different heat input values, namely 0.63 kJ/mm, 0.72 kJ/mm and 0.93 kJ/mm. Specimens were performed by the manual metal arc (MMA) welding method with the usage of rutile covered electrodes. Firstly, the nondestructive visual testing (VT) was carried out. In the next step, the metallographic macro- and microscopic tests were performed. Finally, the hardness of the weld metal and heat-affected zone (HAZ) was measured by the Vickers HV10 method. The performed experiments allow the statement that the Domex 960 steel could be welded in a water environment. It also showed that increasing heat input leads to decreasing the hardness in HAZ by 30 HV10. It may result in decreasing the susceptibility to cold cracking during butt- and filet welding in the water environment.

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“…With the increase of heat input, the weld size continues to become wider. Similar results were observed by Wang et al [36] and Tomków et al [37].…”

Section: Visual Testingsupporting

confidence: 91%

“…Increasing heat input leads to increasing the area of HAZ. Similar results were observed for underwater wet welding of S700MC steel [37]. Moreover, in Specimen 3 (Fig.…”

Section: Macroscopic Testingsupporting

confidence: 88%

Application Possibilities of the S960 Steel in Underwater Welded Structures

2022

Self Cite

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“…Worn ferrous machine components, depending on the cost analysis are replaced by new parts or regenerated. Thus the broad range of surface engineering techniques likewise induction hardening [15], thermal spraying [16,17], conventional overlay welding and cladding [18,19], wet (underwater) welding [20,21] or surface alloying [22,23] are utilised. Literature reports that the most typical materials for regenerating or prolonging thw operation time of cast iron machine parts are polymers [24,25], metal alloys [26,27] or different composites [28,29].…”

Section: Introductionmentioning

confidence: 99%

Factors Influencing Cavitation Erosion of NiCrSiB Hardfacings Deposited by Oxy-Acetylene Powder Welding on Grey Cast Iron

Szala¹,

Walczak²,

Hejwowski³

2021

Adv. Sci. Technol. Res. J.

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“…However, high-strength steel comes with many problems and challenges during welding. For example, high-strength steel suffers from cold cracking when welded in a wet environment [5,6]. In addition, a CGHAZ forms when high-strength, low-alloy steel undergoes rapid heating and high peak temperature welding.…”

Section: Introductionmentioning

confidence: 99%

Effect of Welding Heat Input on Microstructure and Impact Toughness in the Simulated CGHAZ of Low Carbon Mo-V-Ti-N-B Steel

Qiao

Fan

Shi

et al. 2021

Metals

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Welding thermal cycles with heat inputs ranging from 25 to 75 kJ/cm were performed on a Gleeble 3500. The impact energy improved significantly (from 10 to 112 J), whereas the simulated coarse-grain heat-affected zone (CGHAZ) microstructure changed from lath bainite ferrite (LBF) and granular bainite ferrite (GBF) + martensite/austenite (M/A) to acicular ferrite (AF) + polygonal ferrite (PF) + M/A as the heat input increased. Simultaneously, the mean coarse precipitate sizes and the degree of V(C,N) enrichment on the precipitate surface increased, which provided favorable conditions for intragranular ferrite nucleation. The Ar3 of CGHAZ increased from 593 °C to 793 °C with increasing heat inputs; the longer high-temperature residence time inhibited the bainite transformation and promoted the ferrite transformation. As a result, acicular ferrite increased and bainite decreased in the CGHAZ. The CGHAZ microstructure was refined for the acicular ferrite segmentation of the prior austenite, and the microstructure mean equivalent diameter (MED) in the CGHAZ decreased from 7.6 µm to 4.2 µm; the densities of grain boundaries higher than 15° increased from 20.3% to 45.5% and significantly increased the impact toughness. The correlation of heat input, microstructure, and impact toughness was investigated in detail. These results may provide new ideas for the development of high welding heat input multiphase steels.

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Bead-on-Plate Underwater Wet Welding on S700MC Steel

Cited by 19 publications

References 24 publications

Application Possibilities of the S960 Steel in Underwater Welded Structures

Application Possibilities of the S960 Steel in Underwater Welded Structures

Factors Influencing Cavitation Erosion of NiCrSiB Hardfacings Deposited by Oxy-Acetylene Powder Welding on Grey Cast Iron

Effect of Welding Heat Input on Microstructure and Impact Toughness in the Simulated CGHAZ of Low Carbon Mo-V-Ti-N-B Steel

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