Study of the sensitivity of high-strength cold-resistant shipbuilding steels to thermal cycle of arc welding

Layus, Pavel; Kah, Paul; Хлусова, Е. И.; Орлов, В. В.

doi:10.1186/s40712-018-0090-1

Cited by 17 publications

(14 citation statements)

References 9 publications

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“…The volume fraction of perlite in the ferrite matrix was estimated at 1%. The HAZ could be divided into four different zones (see Figure 2b): coarse-grained (CGHAZ), fine-grained (or recrystallized zone-FGHAZ), intercritical (ICHAZ), and subcritical (or over-tempering zone-SCHAZ) [19]. The closest to the WM was the CGHAZ.…”

Section: Metallographic Studymentioning

confidence: 99%

On the Weldability of Thick P355NL1 Pressure Vessel Steel Plates Using Laser Welding

et al. 2020

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Pipeline transport uses millions of kilometers of pipes worldwide to transport liquid or gas over long distances to the point of consumption. High demands are placed, especially on the transport of hazardous substances under high pressure (gas, oil, etc.). Mostly seamless steel pipes of various diameters are used, but their production is expensive. The use of laser-welded pipes could significantly reduce the cost of building new pipelines. However, sufficient mechanical properties need to be ensured for welded pipes to meet stringent requirements. Therefore, laser-welded 10 mm thick pressure vessel steel plates were subjected to various mechanical tests, including high-cycle fatigue tests. Furthermore, the microstructural parameters and the state of residual stresses were determined using X-ray and neutron diffraction, which could affect fatigue life, too. The critical areas for possible crack initialization, especially in and near the heat-affected zone, were found using different tests. The presented results outline the promising application potential of laser welding for the production of pipes for high-pressure pipelines.

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Section: Metallographic Studymentioning

confidence: 99%

On the Weldability of Thick P355NL1 Pressure Vessel Steel Plates Using Laser Welding

et al. 2020

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“…Cold cracks can be located in the weld and in the HAZ. Cold cracking is the main problem in the welding of high-strength low allow (HSLA) steels [17], which are commonly used as a part of offshore constructions [18]. There are a few methods for improving the weldability of steels that are commonly used for joints made in the open air.…”

Section: Introductionmentioning

confidence: 99%

Advantages of the Application of the Temper Bead Welding Technique During Wet Welding

2019

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Thermo-mechanically rolled S460ML steel was chosen for welding in underwater wet welding conditions by covered electrodes. The main aim of this study was to check the weldability for fillet welds in a water environment by controlled thermal severity (CTS) tests and to check the influence of temper bead welding (TBW) on the weldability of the investigated steel. Non-destructive and destructive tests showed that S460ML steel has a high susceptibility to cold cracking. In all joints, hardness in the heat-affected zone (HAZ) was extended to the 400 HV10 values. Microscopic testing showed the presence of microcracks in the HAZ of all welded joints. TBW was chosen as the method to improve the weldability of the investigated steel. This technique allows for the reduction of the maximum hardness in the HAZ below the critical value of 380 HV10, as stated by the EN-ISO 15614-1:2017. It was determined that for S460ML steel, from the point of view of weldability, the pitch between two beads should be in the range 75%–100%. Also, if the pitch between two beads increases, the hardness, grain size, and number of cracks decreases. In all specimens where the hardness of the HAZ was below 380 HV10, there were no microcracks.

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“…The values at T 0 = 300 K are given in Table 4. The microstructure of a welded material is examined in detail and how the heat affected zone is affected by the temperature is explained [47]. In this context, the HAZ can theoretically be designed as an FGM.…”

Section: Modulus Of Elasticity (Gpa)mentioning

confidence: 99%

Experimental Analysis of Welded Rods with a Functionally Graded Material Approach

2020

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In recent years, with the development of welding methods, using these methods in manufacturing industry and in advanced engineering has become more popular. In this study, mechanical properties of rods obtained by friction welding and electric arc welding are compared. Hence, three specimens with different material properties are manufactured, two of which are welded by friction welding and one of which is welded by electric arc welding. These three specimens are adapted to the ASTM E8-04 standard with the help of a universal lathe. Moreover, the tensile stress values and the elasticity modulus of all these specimens are obtained as a result of tensile tests. Accordingly, the effects of the type of welding and material properties used in manufacturing on the mechanical behavior of the specimens are examined. In addition, specimens taken from the cracked surfaces of the pieces broken from the specimens as a result of the tensile test are examined with SEM (scanning electron microscopy). These examinations reveal the microstructure of the specimens. The elemental distribution data obtained as a result of examinations with SEM and the mechanical property data obtained as a result of tensile tests support each other. Furthermore, effects of a heat affected zone (HAZ) on the mechanical properties of the rod are investigated as a functionally graded material.

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Study of the sensitivity of high-strength cold-resistant shipbuilding steels to thermal cycle of arc welding

Cited by 17 publications

References 9 publications

On the Weldability of Thick P355NL1 Pressure Vessel Steel Plates Using Laser Welding

On the Weldability of Thick P355NL1 Pressure Vessel Steel Plates Using Laser Welding

Advantages of the Application of the Temper Bead Welding Technique During Wet Welding

Experimental Analysis of Welded Rods with a Functionally Graded Material Approach

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