Optimization of Welding Modes for High-Strength Low-Alloy Domex 700 Steel

Dzyubyk, Andrii; Palash, V. N.; Khomych, Ivan; Hrynus, Stanislav

doi:10.23939/ujmems2017.02.047

Cited by 4 publications

(5 citation statements)

References 1 publication

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“…The average value in CGHAZ was 252 HV1, in the FGHAZ 243 and finally, in the transition region, the average value 236 HV1 was recorded. These observations are in consistency with other authors [14].…”

Section: Resultssupporting

confidence: 94%

Comparison of the mechanical properties and microstructural evolution in the HAZ of HSLA DOMEX 700MC welded by gas metal arc welding and electron beam welding

et al. 2018

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High strength low alloyed steels are nowadays an important group of engineering materials, with numerous industrial applications. Properly chosen chemical composition together with the thermomechanical processing allow to reach high mechanical properties, while the carbon content is maintained low. Resulting microstructure is therefore sensitive to the amount of the heat introduced to the metal during welding. During welding procedure, softening phenomenon can occur in the heat affected zones and it could lead to the degradation of the mechanical properties of the final joint. Nowadays, welding technologies based on the high energy electron beam are able to produce weld joints with very narrow heat affected zone. In this study, authors compare mechanical properties and the microstructural evolution in the heat affected zone of the GMAW and EB welded joint of the DOMEX 700MC HSLA steel. The carried out experiments showed that both evaluated technologies are able to produce joints with appropriate mechanical properties. Welded joints made by the EBW technique showed slightly better mechanical properties of the whole joint, as a result of the narrower HAZ.

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Section: Resultssupporting

confidence: 94%

Comparison of the mechanical properties and microstructural evolution in the HAZ of HSLA DOMEX 700MC welded by gas metal arc welding and electron beam welding

et al. 2018

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“…The thermodynamics and kinetics of the formation of the observed in the weld metal microstructure is described in [15]. Similar ferrite morphology was reported in [16]. The lower temperatures in HAZ led to a change of the morphology of ferrite from allotriomorphic to Widmanstätten.…”

Section: Resultssupporting

confidence: 64%

“…Following the commonly recommended rules for welding, high strength steels are easy to be welded by all the welding methods used in the manufacturing. Possible implications during welding of high strength steels are formation of cold cracks, brittleness in the coarse grained zone, softening in the heat affected zone [3,4]. As thermo-mechanically treated (hot rolled) steels as S700MC require lower preheating temperatures or even no preheating prior to welding, the welding time is reduced.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Root Gap on the Structure and Properties of High Strength Steel S700MC Welds

Ferdinandov

Gospodinov

Ilieva

et al. 2021

KEM

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Nowadays, the use of high strength (HS) and ultra-high strength steels (UHS) increases, notably in welded constructions. These steels are mainly exploited in heavy loaded welded constructions such as bridges, cranes and excavators, in pressure vessels, vehicles, ships, drilling rigs etc. working at room or lower temperatures. As the welded constructions have specific requirements, the development of high strength and ultra-high strength steels imposes the need for research on the factors influencing their weldability. Among the possible negative implications are: cold cracks formation, softening of the heat affected zone, brittleness in the coarse grained zone. When complying with the generally accepted rules for welding, HS and UHS are readily welded by all conventional welding methods. Recommendations for welding of steels after normalization, thermo-mechanical treatment and quenching and tempering are given in the standard EN 1011 -1, 2. The use of thermo-mechanically treated (hot-rolled) steels with low carbon equivalent, such as S700MC, allows reduction in time required for welding as the preheating temperature is lowered or even preheating is not necessary. A more pronounced negative effect on the weld quality has the presence of different defects. S700MC can be welded by all conventional methods, and a reduction in the softened zone can be achieved by using appropriate welding parameters. Joint preparation for welding of HS and UHS steels is described in the standards EN ISO 9692-1:2013 and EN ISO 9692-2:2001. Nevertheless, the root gap is often the closing part in constructions and does not comply with the standard recommendations. That is why the effect of the root gap on welds has to be researched. The present work introduces results of a research studying the effect of the root gap on the structure and some mechanical and technological properties of S700MS welds, welded by submerged arc welding.

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“…The chosen design scheme of heat distribution should take into account the conditions of the process, the properties of the base metal and the structural dimensions of the welded joint [8], [9]. As a result, it is possible to assess not only the tendency of steel to crack, but also the structural-phase composition and mechanical properties of the metal in the zone of thermal impact of the joint [10], [11].…”

Section: Analysis Of Literary Sourcesmentioning

confidence: 99%

Features of repair welding of power hydrocylinder elements

Dzyubyk¹,

Nazar²,

Dzyubyk³

2020

Ukr. j. mech. eng. mater. sci.

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At present, the use of power hydraulic cylinders is an integral part of most industrial equipment. They provide translational and horizontal movements, replacement of goods, fixation, etc. These devices are necessary elements of the equipment where application of the corresponding level of effort is applied. Often hydraulic cylinders are created specialized to perform certain types of work. It should be noted that part of the elements of the power cylinder in the manufacture is combined with welding. Such integral connections provide rigidity of installation, tightness of a design, fatigue strength at multicycle loadings. Difficult operating conditions, significant workloads, the presence of various external factors often leads to the destruction of individual elements of the cylinder. At the same time, the cost of repairing equipment that involves replacement with new power devices is quite high. This causes the implementation of repair and restoration work carried out at specialized enterprises. However, in the case of repairs, there are often a number of problems that require prompt resolution in the production environment. These should include the provision of basic materials with similar physical and chemical properties, the establishment of welding modes, the selection of the necessary welding materials, the use of appropriate techniques for conducting the arc process, etc. Therefore the repaired welded design of the case of the power hydraulic cylinder needs additional studying for weldability of separate elements among themselves, formation of a zone of thermodeformation influence. In general, the repaired hydraulic cylinder should meet the installation operating requirements depending on the purpose. The design of the considered hydraulic cylinder of the press installation is rather technological from the point of view of maintenance of automation of welding process. It contains long welds of a simple ring configuration. At the same time, the significant linear dimensions and the presence of a cylindrical surface cause some complexity in the implementation of processes. The construction material of the power hydraulic cylinder is low-carbon low-alloy steels. The analysis of technological weldability indicates a tendency to crack due to the thermal cycle of welding. The simulation of welds of the power hydraulic cylinder is performed in the work. The number of rollers was taken into account when obtaining butt welds. A comparative analysis of different electrode materials with different doping systems is done. The most applicable welding materials by chemical composition and properties of the weld metal are determined. According to the literature data and the results of comparative analysis, the optimal range of cooling rate of the main material of the hydraulic cylinder was established. The properties and structure of the zone of thermal influence of the butt welds of the power hydraulic cylinder have been studied. The magnitude of deformations and stresses caused by the thermal cycle of welding of the shell structure of the hydraulic cylinder liner is investigated. The admissible parameters of the zone of plastic deformations during butt welding are determined.

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Optimization of Welding Modes for High-Strength Low-Alloy Domex 700 Steel

Cited by 4 publications

References 1 publication

Comparison of the mechanical properties and microstructural evolution in the HAZ of HSLA DOMEX 700MC welded by gas metal arc welding and electron beam welding

Comparison of the mechanical properties and microstructural evolution in the HAZ of HSLA DOMEX 700MC welded by gas metal arc welding and electron beam welding

Effect of the Root Gap on the Structure and Properties of High Strength Steel S700MC Welds

Features of repair welding of power hydrocylinder elements

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