Influence of Parameters of Laser Beam Welding on Structure of 2205 Duplex Stainless Steel

Landowski, Marcel

doi:10.2478/adms-2019-0002

Cited by 38 publications

(28 citation statements)

References 22 publications

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“…There are HSLA steels in which the preheating process generates positive effects and provides increasing t8/5, which is responsible for decreasing the occurrence of the welding imperfections [17]. During joining in the air, the quality of a welded joint also depends on welding parameters [18] and filler material storage conditions [19].…”

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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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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“…The welding process at the joint is a series of complicated processes such as local heating, metal melting and solidification, therefore, the welded joint is a region with heterogeneous ingredients, organization and mechanical properties [22,23]. The properties of the welding joint are affected by the process parameters of the laser welding such as frequency, beam power, focal length, defocus, spot size, welding beam speed, and shielding gas flow [24]. The weld appearance, i.e., the dimensions of bead width and bead height, is usually used to represent the effect of parameters as well as the process ability of laser welding [24].…”

Section: Methodsmentioning

confidence: 99%

“…The properties of the welding joint are affected by the process parameters of the laser welding such as frequency, beam power, focal length, defocus, spot size, welding beam speed, and shielding gas flow [24]. The weld appearance, i.e., the dimensions of bead width and bead height, is usually used to represent the effect of parameters as well as the process ability of laser welding [24]. In this study, we focused on the process parameters, including the ranges of charge voltage, multiple frequency, and pulse width.…”

Section: Methodsmentioning

confidence: 99%

Laser Welding on Cerclage Wire Joining in Femur Surgery

2020

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Stainless steel wires with fiber-laser welding on lap joints are first proposed in this study to be used as cerclage wire joints for modern femur surgery, because of their potentially larger joint strength and less loosening failure than traditional joint devices. In this feasibility study, an experiment was set up to determine adequate parameters for the laser welding process in order to ensure that the wire joint of cerclage has good weld appearance, free oxidation, and suitable joint strength. A stainless steel wire 316L with a diameter of 1.6 mm, flare-welded on lap joint was used in the experiment as a specimen cerclage wire joint. Two major effective parameters were chosen for controlling a suitable fusion weld, including charge voltage and multiple frequencies of the laser irradiation. The adequate area of the laser parameters was determined from the experiment, including the ranges of charge voltage, multiple frequencies, and pulse width. The suitable welded lengths of specimens were also studied in the mechanical test to validate the joint strength. Suggested welded length has a better tensile strength than traditional cerclage joints. The paper concludes that the stainless wire joints with a fiber laser weld represents a promising alternative to traditional cerclage joint devices for modern femur surgery.

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“…In order to improve the properties of titanium alloys used in medical engineering, many different surface modification techniques are used: plating [6], nanoxidation [7], ion implantation [8], anodizing [9], polishing [10], nitriding [11], nanopatterning [12], coating with diamond derivatives [13] or hydroxyapatite deposition [14][15][16][17]. Modern laser technologies such as hardening, melting, welding, alloying and ablation become also more and more used methods of modifying various materials by contemporary researchers [18]. The increase in interest in these methods is related to the possibility of local processing, satisfactory process efficiency, no deformation of the workpiece, lower cost, broad possibilities of material structure modification and the ability to automate the process and its control.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Laser Alloying of Ti13Nb13Zr on Surface Topography and Properties

Tęczar

Majkowska-Marzec

Bartmański

2019

Advances in Materials Science

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The laser alloying is a continually developing surface treatment because of its significant and specific structuration of a surface. In particular, it is applied for Ti alloys, being now the most essential biomaterials’ group for load-bearing implants. The present research was performed on the Ti13Nb13Zr alloy subject to laser modification in order to determine the treatment effects on surface topography and its some mechanical properties like nanohardness, Young’s modulus, roughness. A pulse laser Nd:YAG was applied at three different laser pulse regimes: either 700 W, 1000 W or 1000 W treatment followed by 700 W modification at a pulse duration of 1 ms. The surface topography and morphology were examined using light microscopy and scanning electron microscopy with spectroscope of X-ray energy dispersion. The mechanical properties were determined by nanoindentation tests and surface roughness with a use of profilograph. The wettability was tested with a goniometer. The obtained results demonstrate complex behavior of the material surface: decrease in penetration distance and increase in hardness after first laser treatment, maintenance of this trend when machining using a higher laser pulse power, followed by an increase in penetration and decrease in hardness after additional laser treatment at lower power input, due to which a surface with fewer defects is obtained. The change in Young’s modulus follows the change in other mechanical properties, but not a change in roughness. Therefore, the observed hardening with the increase of the laser pulse power and then a small softening with the use of additional treatment with lower power can be attributed to some processes of remelting, diffusion and crystallization, sensitive to the previous surface state and heat energy flux. Despite that, the laser treatment always caused a significant hardening of the surface layer.

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Influence of Parameters of Laser Beam Welding on Structure of 2205 Duplex Stainless Steel

Cited by 38 publications

References 22 publications

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

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

Laser Welding on Cerclage Wire Joining in Femur Surgery

The Influence of Laser Alloying of Ti13Nb13Zr on Surface Topography and Properties

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