Effect of cooling rate on microstructure, inclusions and mechanical properties of weld metal in simulated local dry underwater welding

Di, Xinjie; Ji, Shixin; Cheng, Fangjie; Wang, Dongpo; Cao, Jian

doi:10.1016/j.matdes.2015.09.025

Cited by 77 publications

(42 citation statements)

References 22 publications

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“…4 (see Figure 5 e for microstructure) and 5 passes of FZ within the ULCW joint yield more PF and FSP. This results from the fact that the cooling rate, due to the water quenching effect, of the ULCW joint is higher than that of the UDW joint [ 1 ]. Moreover, the No.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, this method is cheaper and more convenient than UDW and raises higher quality welded joints than underwater wet welding. The cooling rate employed after welding by ULCW is different from that used in wet underwater welding and in-air welding [ 1 ]. Similarly, owing to a difference in welding environments, the quality of underwater local dry cavity welds differs significantly from that of dry welds.…”

Section: Introductionmentioning

confidence: 99%

“…During the welding of HSLA, the occurrence of M increases with increasing cooling rate, and has a negative effect on the mechanical properties of welds. Di et al [ 1 ] simulated the local dry underwater welding process of E550 steel. They concluded that rapid cooling rate can improve the impact toughness and tensile strength of weld metal in local dry underwater welding.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure Evolution and Mechanical Properties of Underwater Dry and Local Dry Cavity Welded Joints of 690 MPa Grade High Strength Steel

et al. 2018

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Q690E high strength low alloy (HSLA) steel plays an important role in offshore structures. In addition, underwater local cavity welding (ULCW) technique was widely used to repair important offshore constructions. However, the high cooling rate of ULCW joints results in bad welding quality compared with underwater dry welding (UDW) joints. Q690E high strength low alloy steels were welded by multi-pass UDW and ULCW techniques, to study the microstructural evolution and mechanical properties of underwater welded joints. The microstructure and fracture morphology of welded joints were observed by scanning electron microscope and optical microscope. The elemental distribution in the microstructure was determined with an Electron Probe Microanalyzer. The results indicated that the microstructure of both two welded joints was similar. However, martensite and martensite-austenite components were significantly different with different underwater welding methods such that the micro-hardness of the HAZ and FZ in the ULCW specimen was higher than that of the corresponding regions in UDW joint. The yield strength and ultimate tensile strength of the ULCW specimen are 109 MPa lower and 77 MPa lower, respectively, than those of the UDW joint. The impact toughness of the UDW joint was superior to those of the ULCW joint.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructure Evolution and Mechanical Properties of Underwater Dry and Local Dry Cavity Welded Joints of 690 MPa Grade High Strength Steel

et al. 2018

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“…Afterward, this approach has been adapted both for unbalanced temperature distribution such as welding and laser-assisted manufacturing methods, and for processes involving hard-to-control thermal movements. It is a term used to estimate the internal structure of the weld depending on the cooling rate in the welding method [15].…”

Section: Introductionmentioning

confidence: 99%

On The Relation Between Cooling Rate and Parts Geometry in Powder Bed Fusion Additive Manufacturing

Yılmaz¹,

Kayacan²

2018

acperpro

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Direct metal laser sintering (DMLS), one of the laser powder bed additive manufacturing technologies produces solid metal parts from 3-D CAD data, layer by layer, by melting/sintering and bonding metal powders with a focused laser beam. In these processes isn't complete melting of powder particles in micro melt pools as well as selective laser melting (SLM) and electron beam melting (EBM). Thus some different stress conditions and defects occur depending on the temperature changes during manufacturing. In this study, this problem is investigated aspect cooling rate. Cooling rate affects the solidification process in the melting (sintering) process such as casting, welding, laser assisted processes. Therefore, it also affects part quality and properties. In the scope of study, it is tried to explain how occurring the internal stresses and distortions differ depending on the cooling rates of geometrically different parts in additive manufacturing. The residual stresses and deformations are analysed by FEA to see relation with geometry (volume, area) to cooling rate for Ti6Al4V materials. Cube shaped samples at 20, 40, 60, 80 and 100 mm edge dimensions have analysed by using FEA. Besides 10mm cube sample is manufactured as solid and verified both as experimental and numerical. Based on the FEA results, cooling rate values are changed from 1.67 to 16.67. In conclusion, the reasons of the problems occurring during laser powder bed fusion are investigated in terms of the cooling rate in relation with the samples geometry.

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“…Most general classification of underwater welding processes divide them into dry, wet and local dry cavity ones [1][2][3][4]. A characteristic feature of most commonly used wet welding is direct underwater contact of diver-welder, electrode and base material.…”

Section: Introductionmentioning

confidence: 99%

Temper Bead Welding of S420G2+M Steel in Water Environment

Fydrych

Świerczyńska

Łabanowski

2016

Advances in Materials Science

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The article presents the idea of the use of Temper Bead Welding (TBW) technique to improve the weldability of high strength steel at underwater wet welding conditions. Wet welding method with the use of covered electrodes is described. This work shows results of metallographic examinations and hardness measurements of samples of S420G2+M steel with weld beads performed under water. It has been shown that Temper Bead Welding technique may provide a way to reduce the hardness of the welds, thus is a useful method for improving weldability of high strength steel welded in underwater conditions. The optimum overlap of weld beads (pitch) was set of 55÷100%.

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Effect of cooling rate on microstructure, inclusions and mechanical properties of weld metal in simulated local dry underwater welding

Cited by 77 publications

References 22 publications

Microstructure Evolution and Mechanical Properties of Underwater Dry and Local Dry Cavity Welded Joints of 690 MPa Grade High Strength Steel

Microstructure Evolution and Mechanical Properties of Underwater Dry and Local Dry Cavity Welded Joints of 690 MPa Grade High Strength Steel

On The Relation Between Cooling Rate and Parts Geometry in Powder Bed Fusion Additive Manufacturing

Temper Bead Welding of S420G2+M Steel in Water Environment

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