Influence of welding parameters on diffusible hydrogen content in high-strength steel welds using modified spray arc process

Schaupp, Thomas; Rhode, Michael; Kannengießer, Thomas

doi:10.1007/s40194-017-0535-9

Cited by 18 publications

(29 citation statements)

References 20 publications

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“…For detailed description of the measurement procedure, see [20][21][22]. The total hydrogen concentration for both BM and FM was determined in as received condition using a BRUKER G8 Galileo system (described in [27]) as the Phoenix G4 analyzer only allows solid-state hydrogen extraction. For that purpose, small samples of the materials were melted at a temperature of 1600°C in an impulse furnace and hydrogen was detected by mass spectrometer.…”

Section: Hydrogen Analysismentioning

confidence: 99%

Waiting time before NDT of welded offshore steel grades under consideration of delayed hydrogen-assisted cracking

2021

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Offshore wind turbines (OWT) are a major goal of the energy strategy of Germany encompassing the increase of the installed wind power. OWT components are manufactured from welded steel plates with thicknesses up to 200 mm. The underlying standards and technical recommendations for construction of OWTs encompass specifications of so-called minimum waiting time (MWT) before non-destructive testing of the weld joints is allowed. Reason is the increased risk of time-delayed hydrogen-assisted cold cracking as hydrogen diffusion is very slow due to the very thick plates. The strict consideration of those long MWT up to 48 h during the construction of OWTs leads to significant financial burden (like disproportionately high costs for installer ships as well as storage problems (onshore)). In this study, weld joints made of S355 ML were examined in comparison with the offshore steel grade S460 G2+M. The aim was to optimize, i.e., reduce, the MWT before NDT considering varied heat input, hydrogen concentration and using self-restraint weld tests. This would significantly reduce the manufacturing time and costs of OWT construction. To quantify the necessary delay time until hydrogen-assisted cold cracks appear, acoustic emission analysis was applied directly after welding for at least 48 h.

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Section: Hydrogen Analysismentioning

confidence: 99%

Waiting time before NDT of welded offshore steel grades under consideration of delayed hydrogen-assisted cracking

2021

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“…The hydrogen sources are water vapor and covering of electrodes [18]. The hydrogen content in the joints made in wet welding conditions is in the range of 50-80 ml/100g of deposited metal in comparison with H5 or H10 levels for onshore welds [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Temper Bead Welding of S460N Steel in Wet Welding Conditions

Tomków

Fydrych

Łabanowski

2018

Advances in Materials Science

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Wet welding is the most common method of welding in water environment. It is most often used for repairing of underwater parts of offshore structures. However, the water as a welding environment causes an increase of susceptibility of steels to cold cracking. For underwater constructions high strength low alloy (HSLA) steel are widely used. In wet welding condition a HSLA steel is characterized by high susceptibility to cold cracking. Temper Bead Welding (TBW) was chosen as a method to improve the weldability of S460N steel. The studies showed that TBW technique causes significant decrease of maximum hardness of heat affected zone (HAZ). The largest decrease in hardness occurred in specimens with the pitches in range 66-100%.

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“…A megnövekedett feszültség nagyobb ívhosszat eredményez, így több hidrogén tud disszociálni, viszont állandó áramátadó távolság esetén a szabad huzalhossz csökken, ami magasabb hidrogén koncentrációhoz vezet a varratban. Továbbá, a nagyobb huzalelőtolási sebesség megnöveli a hozaganyag mennyiségét, ami szintén megnövekedett hidrogéntartalmat eredményez [9][10][11][12].…”

Section: A Hidrogéntartalom Forrásaunclassified

A diffúziós hidrogéntartalom hegesztett kötésekre gyakorolt hatása

Kovács

Dakhel

Lukács

2021

MDT

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A hidrogén okozta repedés, illetve a hidegrepedés egy gyakran előforduló károsodási mechanizmus, ami a fémek és az ötvözetek többségére hatással van. A hidegrepedést számos külső és belső paraméter befolyásolja, így a repedéskialakuláshoz hozzájáruló tényezők meghatározása gyakran nehézségbe ütközik. Jelen áttekintő cikkben, hazai és nemzetközi szakirodalmi források alapján, a hidrogén előfordulását, oldhatóságát, diffúzióját és mennyiségi maghatározásának a lehetőségeit vizsgáljuk, valamint a hidegrepedés mechanizmusát és kialakulásának lehetséges megakadályozási módjait foglaljuk össze.

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Influence of welding parameters on diffusible hydrogen content in high-strength steel welds using modified spray arc process

Cited by 18 publications

References 20 publications

Waiting time before NDT of welded offshore steel grades under consideration of delayed hydrogen-assisted cracking

Waiting time before NDT of welded offshore steel grades under consideration of delayed hydrogen-assisted cracking

Temper Bead Welding of S460N Steel in Wet Welding Conditions

A diffúziós hidrogéntartalom hegesztett kötésekre gyakorolt hatása

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