Welding Thermal Cycle Research Articles

Upgrading the mechanical properties of marine structural steel by enhancement of acicular ferrite formation

AbstractThis work reports the results of an investigation of the effect of magnesium addition on microstructure evolution, acicular ferrite formation together with the change in the mechanical properties of micro‐alloyed steel plates. The investigated steel is subjected to high heat input (4.5 kJ mm−1) simulating the thermal cycle of heat affected zones, conducted by induction heating in a computer controlled weld thermal cycle simulator. Both magnesium and magnesium free steel samples have carbon and aluminum contents of 0.08 wt.% and 0.009 wt.%, respectively, are investigated. The change in microstructure, hardness and crack tip opening displacement fracture toughness properties due to magnesium addition is evaluated, and compared with the other steel having the same chemical compositions but without Magnesium. The fracture toughness tests reveal the increase of magnesium steel‘s crack tip opening displacement values. In contrast, the hardness measuring presents the decrease of its hardness due to the decrease of martensite volume fraction and reduction in ferrite grain size. Optical and transmission electron microscopy observations detect some microstructural morphology that can affect the mechanical properties of such steels. Hence, the improved toughness of magnesium containing steel are attributed to both the generation of acicular ferrite nucleated within the matrix, refined microstructure and the bainite dominated microstructure in steel.

Peculiarities of microstructure formation in the heat-affected zone of welded joints of pipes of x100 strength class

The features of the formation of the structure of coarse-grained heat-affected zone (CGHAZ) of a welded joint of pipe steel grade X100 are investigated depending on the cooling rate by simulating welding thermal cycles on thermo-mechanical Simulator – Gleeble 3800. As a result, a continuous cooling thermokinetic (CCT) diagram of austenite decomposition in the CGHAZ metal of pipe steel grade X100 was constructed, which makes it possible to study the structure and kinetics of phase transformations when the steel is exposed to the welding thermal cycle. It was found that the austenite decomposition is accompanied by bainitic and martensitic transformations in the range of cooling rates of 0.1–150 ºC/s. With an increase in the cooling rate, the bainite structure changes its morphology from a globular and coarse acicular to a dispersed acicular with a pronounced packet organization and a lath morphology, islands of the martensite-austenitic (MA)-constituents, which have an acute-angled shape and are distributed at the boundaries between laths, packets and inside them, are gradually transformed into thin layers. The martensite structure appears at a cooling rate of more than 15 ºC/s. Large blocks (crystals) of bainite with MA components can be observed in the structure despite an increase in the cooling rate. Hardness values change from 245–285 to 307–353 HV with the appearance and increase in the fraction of the martensite structure.

EFFECT OF WELD HEAT INPUT ON THE MECHANICAL CHARACTERISTICS OF Cr-Mo STEEL BARS USING THE MIG WELDING PROCEDURE

The impact of weld heat input on the mechanical characteristics of this steel was investigated in this study. The weld sample was an ASTM A304 grade A Flat Bar with a thickness of 5.00 millimetres. With the use of a data logger, a K-type thermocouple was installed in the drilled holes to measure the temperature fields at each of the places throughout the welding operation. The welding sample was created by varying three process parameters in the MIG welding process. Welding current, weld passes, and point of interest thermocouple position away from the weld centreline are the parameters. The experiment was designed using Taguchi's L9 orthogonal array to limit the number of experimental runs (DOE). To study the influence of weld heat input, the samples were subjected to mechanical and microstructure testing. The hardness test revealed that when the weld pass on the weld zone, HAZ, and base metal increases, the hardness value falls. The tensile test finding indicated that the tensile strength of samples 80A and 100A rises as the weld pass increases, however sample 60A decreases as the weld pass increases. The impact resistance increased when the weld pass was increased, according to the findings of the impact tests. The distance away from the weld centreline of the region subjected to a certain peak temperature increases as weld heat input increases, according to the weld thermal cycle. The value of the temperature fields increases dramatically as the heat source passes through the specific cross-section, where thermocouples are positioned. Later on, the temperature begins to drop at a slower rate. It's also obvious that when the distance between the measurement point and the weld centreline grows, the temperature drops.

Structure and mechanical properties of welded joints of high-strength low-alloy steel for arctic purposes

The work is devoted to the research of cracks causes in welded joints of high­strength steel for arctic purposes based on the study of the structure and mechanical properties of the weld metal and the zone of thermal influence. Consumers of machine­building products make increasingly high demands on welded joints of metal structures. This necessitates the use of rolled steels for their production, which have increased mechanical and special properties. When welding MAGSTRONG W700 type steels, cracks are observed in local sections of welded joints. It was established that the structure of the weld metal of welded joints of MAGSTRONG W700 steel is characterized by the presence of columnar crystals with a hardness of 312 – 323 HV. The metal structure in the overheating area of thermal influence zone is characterized by the presence of enlarged primary grain, as well as batch formations of bainite and bainite-martensite with hardness of 338 – 352 HV. The level of temporary resistance to rupture of the metal in thermal influence zone is 618 – 627 MPa. Depending on the test temperature, values of the impact strength of the metal in thermal influence zone vary from 62 to 86 J/cm2. MAGSTRONG W700 steel has good resistance to the formation of hot cracks during welding (UCS = 20,3), however, it has an increased tendency to form cold cracks (CE = 0,48). Analysis of the data obtained showed that destruction of welded joints of the studied steel occurs due to its unsatisfactory weldability. Such weldability is due to a complex chemical composition, as well as a whole set of factors (such as the formation of unfavorable structures in the metal of welded joints under the influence of thermal welding cycles, a complex picture of welding stresses, the level of which exceeds the temporary resistance to metal rupture). Also, the structure of the weld metal has a large­crystalline structure, which significantly weakens the connection.

FEATURES OF MICROSTRUCTURE FORMATION IN THE WELDED PIPE JOINTS DURING HIGH-FREQUENCY WELDING AND SUBSEQUENT LOCAL HEAT TREATMENT

The transience of heating and cooling processes during high-frequency welding (HFW) of pipes leads to the formation in the heat-affected zone (HAZ) of a coarse-grained strained bainitic and/or martensitic structure with high hardness. Local or volumetric heat treatment is used to correct the microstructure of the HAZ. The paper presents the results of a study of the structure and properties of welded pipe joints produced at the Vyksa Steel Works. It has been established that the microstructure of the welded joint of pipes made of low-carbon steels (not more than 0.07% C) is mainly bainite of lath morphology, and for steel with a high content of carbon (~0.3%) and manganese ‒ martensite. To estimate the temperature field in terms of the angle and thickness of the pipe wall during local heat treatment a finite element model was created. The paper shows that the use of the model made it possible to optimize the heating parameters during the local heat treatment of pipes of various sizes. The experiments on local heat treatment of pipes with a diameter of 325 mm, made from rolled products 8 mm thick of steel 09Г2С, showed a significant refinement of the initial microstructure of the HAZ, an increase in uniformity and the disappearanc of structural heat-affected zones. In medium carbon steels (~0.3% C) with a high manganese content, the thermal cycle of HFC welding leads to formation of martensite. The local heat treatment in the form of normalization does not allow one to exclude the formation of martensite in the segregation zones due to the high cooling rate. The local heat treatment of welded joints in pipes made of steel 30Г (Russian Standard) in the high tempering mode (650–700 °C), with preliminary cooling of the welded joint to a temperature below the completion of the martensitic transformation (in segregation zones ~50 °C), makes it possible to release the segregation martensite and form the microstructure of sorbitol there.

Effect of Ce on microstructures, carbides and mechanical properties in simulated coarse-grained heat-affected zone of 800-MPa high-strength low-alloy steel

The application of oxide metallurgy technology to induce the formation of acicular ferrite in coarse-grained heat-affected zone (CGHAZ) to improve the welding performance of steel is a research hotspot in recent years. However, the enhancement mechanism of mechanical properties after Ce addition and the behavior of microstructures in CGHAZ of 800-MPa high-strength low-alloy (HSLA) steel are rarely reported. In the present study, the effect of Ce addition on the welding performance of 800-MPa HSLA steel was investigated by analyzing the microstructures, carbides and mechanical properties in the simulated CGHAZ. The results indicated that after the welding thermal cycle, the decrease in toughness in the CGHAZ was mainly caused by the significant decrease in the crack propagation energy. Compared to the Ce-free steel, Ce addition improved the toughness of the base metal and CGHAZ by increasing the crack propagation energy. With the same heat input, the CGHAZ strength of the Ce-containing steel was higher than that of the Ce-free steel. During the welding thermal cycle, the Nb and Ti carbonitrides greatly affected the grain growth in the CGHAZ. Ce addition significantly refined these carbonitrides, providing a stronger pinning pressure to inhibit austenite grain growth in the CGHAZ. Ce addition also refined the austenite grains and increased the proportion of high-angle boundaries in the CGHAZ, increasing the impact absorb energy and decreasing the strength loss of the CGHAZ, essentially improving the welding performance of the HSLA steel. These results are helpful for clarify the mechanism by which Ce improved the welding performance of the 800-MPa HSLA steel.

Analysis of the Low Cycle Fatigue Behavior of DP980 Steel Gas Metal Arc Welded Joints

Dual phase (DP) steels have high strength, while maintaining outstanding elongation capacities. This is possible using a well-controlled thermomechanical process that produces a perfect phase combination in the DP microstructures. However, automotive makers are required to weld the DP steels, which generates a soft zone in the microstructure. In this work, 1.6 mm-thick DP980 steel sheets were welded by gas metal arc welding process to analyze the response of the welded soft zone to cyclic loading conditions. Conducted macrographic and metallography analyses revealed good quality in the appearance of the welded joints, with a complete fusion of the DP980 joint and without the presence of discontinuities. Low cycle fatigue tests of the DP welded joints were conducted under a constant amplitude strain control mode. The welded joints experienced a fatigue life reduction with respect to the DP980 steel of ~16% at strain amplitudes of 0.2, 0.3, and 0.4%. For strain amplitudes larger than 0.6%, the fatigue life of the welded joint was reduced by 39%. Weld thermal cycles combined with metallography analysis indicated that a tempered process of the martensite during the welding was responsible for the soft-zone formation and the poor fatigue response.

Dissimilar Dual Phase-Low Carbon Steel Joints by the GMAW Process Subjected to Impact Load

Dissimilar welding used in the automotive area are possible joints with the GMAW process; however, its structural performance must be evaluated. The focus of this work is to study the microstructural–mechanical properties of dissimilar welding DPC340Y590T dual phase–JSC270C low carbon steels. Microhardness profile, tensile, and impact tests were used to evaluate the mechanical behavior, while optical and scanning electron microscopy were employed to evaluate the microstructural changes. The tensile strength was 540 and 275 MPa in dual phase and low carbon, respectively. Weld thermal cycles were obtained by means of K type thermocouples. The welding heat input generated martensite and grain growth in the dual phase heat affect zone, while grain growth and perlite phase increased in the low carbon heat affected zone. The variation in microhardness profile was produced by the presence of different phases, and the temperature at the end of dual phase heat affect zone was approximately 242 °C. During impact tests, the absorbed energies were 19.3, 50.7, and 50.2 J for low carbon, dual phase steel, and the welded dissimilar joint respectively. Finally, dissimilar welding subjected to tensile test failed in the low carbon steel (270 MPa), out of the heat affect zone, thus a good dissimilar joint between both steels was obtained.

Improvement of welding stability and mechanical properties of galvanized DP800 steel lap joint by high-speed tandem beam laser

Dual beam laser welding has shown promise to improve the weldability of galvanized dual phase steels. In this study, the lap joints of galvanized dual phase steel were welded with tandem beam laser at speed up to 100 mm/s. The power ratio for the dual beams was set to 50%:50%, 40%:60%, 30%:70%, and 20%:80%, respectively. A high-speed camera was used to observe the dynamic process of zinc vapor, molten pool, and keyhole behaviors under different welding conditions. The corresponding metallographic and mechanical analysis were conducted to reveal the effects of variable welding thermal cycles on the microstructures and properties of the welded joints. The results indicate that the fusion zone (FZ) is composed of blocky-lath martensite, whereas the heat-affected zone (HAZ) is characterized by the lath microstructure containing tempered martensite (TM) and ferrite (F). The power ratio of dual beams significantly affects the microstructures and hardness profiles of welded joints. It also influences the zinc-vapor and molten pool dynamic behaviors, thus affecting the weld bead formation. The weight of spatter decreases with the decrease of leading beam power in tandem beam laser welding process. In addition, the mechanical properties of the welded lap joints are significantly affected by the high-speed tandem dual beam laser welding process parameters. The failure load of tensile-shear testing reaches the maximum value when the beam power ratio is 30%:70%.

Microstructure and mechanical properties of friction stir welding joint of in-situ ZrB2/AA7085 composites

Friction stir welding (FSW) has been widely used to join Al-Zn-Mg-Cu alloys. As the mechanical properties of the heat affected zone (HAZ) of Al-Zn-Mg-Cu alloys joints are affected by the additional welding thermal cycle, which always contributes to a weak HAZ. In this paper, the in-situ ZrB2 particle was used to optimize the mechanical properties of the HAZ of Al-Zn-Mg-Cu alloy joint. The effects of mass fraction of ZrB2 particle on the microstructure and tensile properties of in-situ ZrB2/AA7085 composites FSW joints were studied. The results showed that the coarsening of precipitates contributed to the softening of HAZ and declined the strength of AA7085 FSW joint to approximately 294.3 MPa. Small amount of in-situ ZrB2 (1 wt%) provided an additional strength of HAZ and increased the strength of the FSW joint to approximately 367.2 MPa. However, when the content of ZrB2 increased to 3 wt% and 5 wt%, many ZrB2-rich band structures were formed in stir zone. The brittle nature of the ZrB2-rich band structure resulted in the crack initiation and propagation in stir zone. It declined the strength of ZrB2 (3 wt% and 5 wt%)/AA7085 FSW joint to 308.3 MPa and 275.5 MPa, respectively.

Tantalum Alloy Welding: Does the Thermal Cycle Influence the Microstructure?

The aim of the present work is to verify the microstructural behavior of a B 521 tantalum alloy UNS Grade R05200 after welding, in relation to the welding thermal cycle. The joint design was a 1.5 mm thickness circumferential butt welding, on a 32 mm outside diameter pipe, welded in 1 G position (horizontal, flat, and rotating). The chosen welding process was gas tungsten arc welding (GTAW). The microstructural analysis showed the presence of coarse, dendritic-columnar structures, as well as a hexagonal cell, with no cracks noted. Hardness tests showed an increase in hardness, from 120 HV to 425 HV, in the heat-affected zone. Through finite element methods, the behavior of the temperature field was estimated and compared.

Effect of V Content and Heat Input on HAZ Softening of Deep-Sea Pipeline Steel.

In this paper, the welding thermal cycle process of deep-sea pipeline steel was investigated by welding thermal simulation. The microstructure evolution, crystallology and second-phase precipitation behavior of the soft zone of the heat-affected zone (HAZ) were characterized and analyzed by combining scanning electron microscopy, electron back-scattered diffraction, transmission electron microscopy and hardness testing. The results show that HAZ softening appeared in the fine-grained zone with a peak temperature of 900–1000 °C for deep-sea pipeline steel, the base metal microstructure of which was the polygonal ferrite and acicular ferrite. Using V microalloying and low welding heat input could effectively decrease the softening of the HAZ fine-grained region, which was achieved by reducing the effective grain size, increasing the proportion of the dislocation substructures, and precipitating the nanoscale second-phase particles.

Morphology and crystallography of microstructures in Mg-deoxidized offshore engineering steels after simulated welding thermal cycles

ABSTRACT The morphology and crystallography of microstructures in heat-affected zone of offshore engineering steels with 0.0002 and 0.0042 wt% Mg were studied. With increasing Mg content from 0.0002 to 0.0042 wt%, the prior austenite grain (PAG) size increases from 92 to 163 μm, which decreases the PAG boundary density and increases the bainite transformation temperature. So the bainite nucleation sites and driving force reduce, affecting bainites with morphology and crystallography. For morphology, the sympathetic nucleation reduces and widening growth rate of bainitic laths increases, coarsening microstructures. For crystallography, the variant selection is intensified, coarsening the unevenly distributed Bain zones with specific variants and reducing the high-angle grain boundary (HAGB) density from 1.4 to 0.6 μm–1. The coarsened microstructure with lower crack resistance increases the ductile-brittle transition temperature, contributing to the ductile fracture transforming to cleavage fracture and the HAZ toughness at –40 °C decreasing from 201 to 58 J.

Effect of Welding Thermal Cycle on Microstructural Characteristics and Toughness in Simulated Heat Affected Zone of Low-C Medium-Mn High Strength Steel

Effect of Welding Thermal Cycle on Microstructural Characteristics and Toughness in Simulated Heat Affected Zone of Low-C Medium-Mn High Strength Steel

Porosity Formation in Thin Welded Joints of Al-MG-LI Alloys.

This work is about the study of the correlation of pore formation in welded joints of Al–MG–LI alloy with zirconium additives with the state of the base metal, thermal vacuum treatment, and welding technologies MIG and EBW. Metallographic analysis has been carried out, the phase composition of the alloy and weld metal has been investigated, and thermal cycles of welding have been calculated, allowing to estimate the residence time of metal in the alloying zone and weld metal in the liquid state. The nature of the allocation of strengthening fine-dispersed phases in the welded joints of the alloy has been determined. The regularity and character of pore formation in welded joints depending on the applicable thermal vacuum treatment (TVT) and welding technology have been revealed. It was established that TVT with subsequent hardening and aging has no effect on the phase composition of the alloy. However, this type of treatment contributes to the formation of a more homogeneous and uniform nature of the separation of fine-dispersed strengthening phases. It was revealed that the MIG technology (metal with and without TVT) is characterized by a large length of the fusion zone, the high residence time of metal in the fusion zone and weld metal in the liquid state, and the formation of pores. Phase formation in the temperature range of the beginning and end of the alloy crystallization occurs not only in the weld at the final stage of crystallization but also in the fusion zone, which may induce pore formation, whereas EBW welding shows the opposite trend and no pores. It was found that EBW technology prevents pore formation and makes it possible to obtain welded joints of 1420 Al alloys of the required quality.

Effect of shielding gas on microstructure and mechanical properties in AA6061-T6 alloy MIG welding

Due to its properties such as high strength/weight ratio, enhanced corrosion resistance, low density, AA6061-T6 aluminum alloy welding is widely used in structural, automotive and rail industry. In this study, AA6061-T6 alloy was welded with robotic metal inert gas technique using ER5356 filler wire. The effects of different shielding gas composition ratios (argon/helyum) on the macro / microstructre, mechanical properties (hardness, tensile strength) of the weld joint were investigated. Welding porosity decreased with the addition of helium gas to argon gas. Accordingly, the tensile strength of welded joints increased from 190 MPa to 221 MPa with the addition of helium gas. The strength of the welded joints (190-221 MPa) was obtained lower than that of the base material (290 MPa) due to the changes in the microstructure as a result of the weld thermal cycle and grain coarsening in the heat affected zone. Dentritic, columnar and coarse shaped grains were observed along the weld section, respectively in the weld bead, partially melted zone and heat affected zone. The differentiation of the shielding gas composition did not cause these regions to change, but the heat affected zone expanded with the increase in the helium content. The change in hardness of the cross section of welded joint has increased from around 60 HV to 90 HV from the welding area to the base material. 25% Argon-75% Helium gas mixtures provided optimum combination in terms of microstructure, mechanical properties and cost.

Influence of thermal cycles of repair electroslag welding on the structure and mechanical properties of joints of cast medium carbon steels

The results of the study of the effect of thermal cycles during multi-pass electroslag welding on mechanical properties of the weld metal and the heat affected zone (HAZ) are presented. It is shown that one of the ways to approximate the mechanical properties of the welded joint to the properties of the base metal without high-temperature heat treatment is to perform electroslag welding not in one but in several passes, when the heat released during each adjacent pass affects the previously welded sections, producing their partial heat treatment, improving the mechanical properties. Analysis of thermal cycles showed that the cooling rate of the metal HAZ of each weld within the temperature range 600...500°C (w6/5) does not exceed critical values for 35L steel type, and also decreases with the welds overlapping, i.e., the danger of martensite formation in this zone is absent. It has been established that the effect of automatic heat treatment of welds results in the structure recrystallization, contributing to grain refinement in the overheating area of the heat transfer zone and weld metal and significant improvement of the mechanical properties. The results of impact bending tests (KCU) of the welded joints showed that the toughness impact in the areas of the weld metal, which have undergone the accompanying heat treatment, exceeds that one of the base metal, as well as the regulatory requirements, by 2...4 times.

Modeling of AMg6 alloy recrystallization in the forged layer during the overlay welding of a material in the process of hybrid additive manufacturing

The regularities of static recrystallization during the welding of metal layer over the face of a prismatic specimen pretreated by plastic deformation are studied. This problem is of interest in selecting the rational parameters for the process of hybrid additive manufacturing of light and high-strength linear elements of segmented structures made of aluminum-magnesium alloys via layer-by-layer forging with a pneumatic hammer. For this purpose, the two independent problems of the one-sided forging of a prismatic specimen and temperature evolution during the plasma-arc welding of a layer over the same specimen are solved numerically. The fields of accumulated deformations and the history of temperature changes in the specimen are used to calculate the volume fraction of statically recrystallized material in the work-hardened layer under the influence of a thermal cycle temperature. The forging calculation was performed based on the LS-DYNA® package, the thermal problem was solved in Comsol Multiphysics®, and the fraction of recrystallized material was calculated by making use of the Wolfram Mathematica system. In the numerical model, the impact of the pneumatic hammer was estimated by means of a strain-gauged steel target, and then was verified by evaluating the distortions of the cross-section of the forged bar made of AMg6 alloy measured in the experiment. The thermal effect was calculated taking into account the PI controller, which automatically controls the overlaying process in the hybrid additive manufacturing plant. The volume fraction of a statically recrystallized material was calculated using Avrami's law and data on the dependence of the time of 50% transformation of the material on the accumulated deformation and the temperature taken from the literature on aluminum-magnesium alloy 5083, which is similar to AMg6. The model predicts a high sensitivity of the fraction of recrystallized material to previous plastic deformation and to the maximum temperature in the thermal cycle of overlay welding, and therefore a more localized boundary layer of recrystallized material compared to the boundary layer in plastic deformation. The results of calculation demonstrate the effectiveness of layer-by-layer pressure shaping strategies for providing deep-layer plastic deformation. In terms of the degree of recrystallization, the use of rational modes of overlay welding and forging can ensure the synthesis of products with high strength and ductility characteristics in hybrid additive manufacturing processes.

Integrated Assessment of Weldability of Steel with Increased Strength

Modern production of agricultural equipment and facilities, hulls of ships, stationary oil drilling platforms, wind energy installations and other metal structures makes extensive use of sheet steel of increased strength. The main manufacturing process is welding, the quality of which depends on multiple factors, including the ability of steel to resist welding. It is known that the properties of the thermal influence zone are highly dependent on phase transformations, the nature of which is determined by the intensity and development of diffusion processes of carbon redistribution and alloying elements under the impact of the welding thermal cycle. Therefore, it is necessary to evaluate the weldability of the steel of a certain chemical composition, in order to choose the optimal method and the technological parameters of the welding mode for the manufacture of a specific metal structure. In order to reduce material costs, you can use analytical calculation methods that were developed at the E.O. Paton Electric Welding Institute. They are based on the analysis of the literature and the study of about 150 diagrams of the thermokinetic decomposition of austenite. Mathematical models make it possible to predict with a sufficient degree of accuracy the phase composition and mechanical properties of the high-temperature thermal influence zone depending on the chemical composition and cooling time of the metal, heated to a maximum temperature of 1350ºC, in the temperature range 850-500ºC. However, such tests are quite expensive and do not allow optimization of weld properties when the welding mode, mode, welding materials and other underlying technological factors change. In this connection, the objective was to assess the reliability of the proposed methodology in the study of weldability of shipbuilding steel of the increased strength of the category E36, for the weakest T(transverse) – the orientation of the sheet of 50 mm thickness. A high performance of the steel category is achieved by a limited increase in the aluminium content or other grain-crushing elements (Nb, V, Ti), which ensures that the size of the austenitic grain is not greater than the fifth point. The research showed that analytical methods for calculating the mechanical characteristics of high temperature HAZ sites by chemical composition, taking into account the cooling rate after welding, provide a level of confidence sufficient for practical application and can be recommended for the primary evaluation of the properties of welded compounds of high-thickness steel plates of category E36 (T-orientation). The impact work (KV-40) of the high-temperature sections of the high-temperature thermal influence zone is not subject to an analytical evaluation with the degree of accuracy required for production practice

Mechanical characterization and simulation of PCGTAW welded thin sheet of SDSS material

In this research paper, Pulsed Current Gas Tungsten Arc Welding (PCGTAW) process is used to weld the thin sheet of Super Duplex Stainless Steel (SDSS). From the Bead on Plate (BoP) trials the parameters for full penetration butt joint were identified. Heat input obtained from the welding parameter is 0.144 kJ/mm. Microstructural characterization of Welded joint revealed the coarse grain microstructure in the Heat Affected Zone (HAZ) and Weld Zone (WZ) due to weld thermal cycle and slows cooling rate concern. Due to this high temperature in the WZ austenite grains are changed in the shape of Widmanstatten austenite, grain boundary austenite, and intragranular precipitates created from ferrite grains. The tensile strength of welded joints (800Mpa) is 3.75% less as compared to base metal tensile strength (830Mpa). The ductility of the weld joint is decreased as compared to base metal due to the presence of coarse grain in the HAZ and WZ. PCGTAW joint's micro-hardness is 0.7 HRC lower than the base metal due to weld thermal cycle involvement. Abaqus software is used to validate the tensile test result. The numerical analysis result is similar to the experimentally obtained tensile test result with a maximum error percentage is of 0.8%.