Weldability of S700MC steel welded with the hybrid plasma + MAG method

Skowrońska, Beata; Chmielewski, Tomasz; Golański, Dariusz; Szulc, J.

doi:10.1051/mfreview/2020001

Cited by 30 publications

(31 citation statements)

References 17 publications

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“…The weldability of steels in the air environment is widely investigated. It has been shown that it depends on chemical composition, manufacturing method, and technological, metallurgical, and construction factors, and above all the welding technology [15][16][17]. Much less frequently mentioned is the subject of steels with yield strength higher than 420 MPa welded directly in the water.…”

Section: Introductionmentioning

confidence: 99%

Dissimilar underwater wet welding of HSLA steels

Tomków

Fydrych

2020

Int J Adv Manuf Technol

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The high-strength low-alloy S460ML and S460N steels were chosen for underwater wet welding of dissimilar T-joints using covered electrodes. For improving the quality of joints, the temper bead welding (TBW) method was used. The application of TBW in pad welding conditions has been investigated earlier but the possibility of usage of this technique in welded joints was not analyzed. The main aim of the study was to check the influence of TBW on the hardness and structures of the heat-affected zone (HAZ) of dissimilar T-joints made in the underwater conditions. The experiments conducted showed that the technique used can reduce the susceptibility to cold cracking by decreasing the hardness in HAZ, which is a result of changes in its structure. The TBW technique reduced the hardness in the HAZ of the S460N steel by 40-50 HV10 and in S460ML by 80-100 HV10. It was also found that the changes in S460ML and S460N were much different, and therefore, the investigated technique can provide better results in the steel characterized by lower carbon equivalent Ce IIW .

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Section: Introductionmentioning

confidence: 99%

Dissimilar underwater wet welding of HSLA steels

Tomków

Fydrych

2020

Int J Adv Manuf Technol

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“…As a method for improving the weldability of steel local heat treatment, provided by the heat from additional stitches, was chosen. Weldability tests are commonly used to evaluate the possibilities of the welding in the air for different materials [42,43], and in the water [35]. A Tekken weldability test was chosen for investigation.…”

Section: Introductionmentioning

confidence: 99%

Underwater In Situ Local Heat Treatment by Additional Stitches for Improving the Weldability of Steel

Tomków

Janeczek

2020

Applied Sciences

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In this paper the influence of in situ local heat treatment performed by additional stitches on the weldability of high-strength low-alloy (HSLA) S355J2C+N steel was tested. The investigated steel is characterized by high susceptibility to cold cracking. It is necessary to find a method to improve the quality of welded joints. The local heat treatment was applied as an effect of bead-on plate welding made on the face of a Tekken test joint. The specimens were made by the use of covered electrodes in the water environment. For testing weldability, Tekken test specimens were made. Then, the different number of the pad welds with different overlapping were laid on the face of the tested welds. Non-destructive (NDT) visual and penetrant tests were undertaken. During the NDT, imperfections like shape mistakes and spatters were found. Then, metallographic macro- and microscopic testing were performed. The macroscopic observations proved that water environment can generate imperfections like cracking and pores. However, for specimens with additional stitches the number of imperfections decreased. Microscopic tests proved that the proposed technique affected the structure of the heat-affected zone (HAZ). The specimens without the application of additional stitches are characterized by brittle bainitic and martensitic structure. Specimens, in which the additional stitches were applied, contain tempered martensite, fine ferrite and fine pearlite in their HAZ. It was also observed that the number of cracks decreased for in situ local heat-treatment specimens. The final step was Vickers HV10 hardness measurement. These measurements confirmed previous results. The heat from additional stitches affected the steel by significantly decreasing the hardness by 80–100 HV10. The results of experiments showed that the heat from pad welds provided microstructural changes in heat-affected zones and a decrease in the susceptibility to cold cracking, which results in improvement in the weldability of HSLA steel in wet welding conditions.

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“…These steels are also used in civil engineering. They have proved particularly useful in the production of the largest suspension bridges in the world, reducing the number of main supports and improving welding efficiency [11][12][13][14]. These steels are particularly suitable for the construction of buildings located in areas threatened by seismic shocks.…”

Section: Introductionmentioning

confidence: 99%

Numerical Verification of Tests on the Influence of the Imposed Thermal Cycles on the Structure and Properties of the S700MC Heat-Affected Zone

Kik

Górka

Kotarska

et al. 2020

Metals

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The article presents the results of studies on the influence of simulated thermal cycles parameters on the structure and properties of the heat-affected zone (HAZ) of thermo-mechanically rolled S700MC steel. For this purpose, resistance heating tests of the tested samples were carried out to determine the effect of maximum temperatures of the imposed thermal cycles with different maximum temperatures at a constant cooling time in the temperature range between 800 and 500 °C (t8/5) and to study the influence of changes of this time on the structure and hardness as well as the tensile strength, elongation and toughness of the simulated HAZ in S700MC steel. The results of the tests, were supported by the results of finite element method (FEM) analyses in the VisualWeld (SYSWELD Code) software of the ESI Group. Selected heat distributions during heating, distributions of individual metallurgical phases and hardness were compared with results from real tests. On the basis of the results presented, an attempt was made to explain the decrease in mechanical and plastic properties in the HAZ area caused by the influence of the welding heat cycle.

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Weldability of S700MC steel welded with the hybrid plasma + MAG method

Cited by 30 publications

References 17 publications

Dissimilar underwater wet welding of HSLA steels

Dissimilar underwater wet welding of HSLA steels

Underwater In Situ Local Heat Treatment by Additional Stitches for Improving the Weldability of Steel

Numerical Verification of Tests on the Influence of the Imposed Thermal Cycles on the Structure and Properties of the S700MC Heat-Affected Zone

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