Abstract
The stainless clad steel materials (particularly A283-Gr-C hot-rolled to austenitic stainless steel plate SA240 TP 316L) have become widely used in the fabrication of heat exchangers, pressure vessels, and other components owing to their very interesting properties and low production cost. These cladded materials are mostly joined using multi-pass welding techniques. The temperature distribution that supervenes during welding affects the microstructures and the mechanical properties and may generate residual stresses in the heat-affected zone of the welded plates. Since limited experimental data are available in the literature regarding the complex cases of multi-pass welding of cladded steel materials, a thorough experimental study was performed in order to evaluate the temperature distribution on the welded plates. In fact, eight K-type thermocouples were fixed at different distances from the weld centerline in order to record the temperature evolution along longitudinal, transversal, and thickness directions during the welding process. Due to the unavoidable effects of the generated heat fluxes that always follow the welding, several dimensional changes were occurred on the welded plates. In this study, the longitudinal shrinkage and the angular distortion generated during the welding process by the effect of the heat fluxes were investigated. Then, tensile and bending tests were performed in order to check the welded plate reliability. It was found that (i) the welded joint presents a higher mechanical tensile strength than the parent metal and (ii) no separations, fractures, or tearing appear on the weld joint surface after the bending test.
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1 Introduction
In recent years, there has been a spate of interest in the development of new materials, which exhibit better properties than the existing ones, and can be used in industrial applications at a reduced cost. Known as «cladded steel», these new materials were provided by joining different materials together using specific methods. Different methods of bonding clad materials have been industrialized. Kaya and Kahraman [1], for instance, investigated the explosive cladding, while Venkateswara Rao et al. [2] studied the weld overlay cladding. In other studies, Khodadad et al. [3] worked on the roll bonding, whereas Ganesh.al [4] investigated the laser cladding. Taken together, these bi-materials exhibit a good corrosion resistance, good environmental stability, high specific resistance, and low production cost. Although each bonding method has its own advantages, the hot-roll technique seems to be the most commonly used process in the industries due to its large productivity, effective cost, and efficiency. This is can be confirmed by the work achieved by Flahaut. [5]. The most commonly fabricated hot-roll cladded steel sheets are Al/304L [6], Fe/Ni alloy [7], and carbon steel/ stainless steel [3, 8]. Lately, since the hot-rolled clad plates seem to be the most economical solution to build pressure vessels [5], heat exchangers, and vessels reactors, considerable efforts have been made to develop carbon steel/stainless steel-clad material, which combined the already mentioned best properties to a reduced cost.
The welding of the stainless clad steel material is the most suitable joining method used in the industries. Several welding processes, such as shielded metal arc welding (SMAW) [9, 10], gas tungsten active welding (GTAW) [9,10,11], submerged arc welding (SAW) [12], laser welding [13], and gas metal arc welding (GMAW) [11], are used in the welding of the stainless steel cladded plates. All these processes are convenient to satisfy the corrosion resistance and mechanical properties requirements. However, the welding of the stainless clad material may meet several challenges and the welding difficulties relating to the welding process of the stainless clad steel plate need to be taken into account. To start with, the clad layer and the substrate have many differences in physical and mechanical properties, such as thermal expansion coefficient and heat conductivity. The difference in properties may lead to the formation of a high residual thermal stress at the welding clad interface during the welding and cooling processes [14, 15]. In addition, a clear variation in chemical composition is often present between the clad layer and the substrate. Alloy elements (i.e., Cr and Ni) in the clad layer can easily dilute and diffuse into the carbon steel welded bead, leading to low contents of alloy elements and a low corrosion resistance of the clad layer [2]. Furthermore, excessive diffusion of alloying elements can result in the formation of Cr23C6 carbides, leading to a severe intergranular depletion (Cr-depletion) and intergranular cracks [16]. Moreover, Wang et al. [17] reported in their work that a decarburized layer and a carbon rich layer were also found in the welding interface due to the easily dilution and the carbon diffusion.
In addition, during the joining process, the heat produced by the welding would influence the mechanical properties of each material making the cladded steel. Several researchers studied the joining method as well as the mechanical behavior and distortions generated by the multi-pass welding of the stainless clad steel. Park and Lee [18] have studied the mechanical properties and sensitivity of carbon steel A516 Gr 70 cladded to stainless steel A316. Itsuro et al. [19] investigated the distortion of the austenitic stainless clad steel. They reported that the formation of shrinkage and distortion were due to the welding process of the mild steel. They also reported that after welding, distortion was observed on the mild steel due to the amount of weld metal deposited at the mild steel side.
In view of the above discussion, it is clear that limited experimental data were found in literature regarding the temperature distribution and its effect on the bi-material distortions in the case of complex multi-pass welding of the cladded steel materials. In this context, an industrial case was proposed by SOCOMENIN company in order to study the effect of the welding process on the stainless cladded steel A240 TP 316L hot-rolled to A283 Gr C. In fact, building tanks dedicated to hydrochloric acid conditioning requires the use of a thick material with a good corrosion resistance. Considering these requirements, the company thought of using a thin layer of stainless steel hot-rolled to thick low carbon steel instead of a thick stainless steel material, as it would be a cheaper solution. Because of the dearth of information regarding the temperature evolution during multi-pass welding of the cladded steel and its effect on the studied bi-materials, and in order to evaluate the integrity of the welded joint, the present paper aims to (i) study the evolution of the temperature distribution during the multi-pass welding process on the stainless clad steel plates, (ii) investigate the dimensional changes of the welded plates generated by the effect of the heat fluxes during the welding process, and (iii) examine the tensile and bend mechanical properties of the welded joint in order to confirm the welding reliability.
2 Experiment setup
Two plates with dimensions of 200 mm × 400 mm were extracted from a cladded sheet metal obtained by hot-roll bonding. This bi-material consists of a 12 mm low carbon steel as a base metal (A 283 Gr C) and a 3 mm austenitic stainless steel as a clad layer (A 240 TP 316L). The typical chemical composition of the clad material is given in Table 1. Before the welding process, the preparation of the joints seems to be mandatory to fuse the entire faces of the two materials. Thence, the plates were fitted up by chamfering a UV-groove joint between them. Then, they are tacked together at both ends with a uniform gap of 3 mm according to the industrial practice code ASME Section IX QW-402 [20]. Actually, the function of the root gap and root face are, respectively, to allow penetration and remove heat excess as it acts like a heat sink. Figure 1a and b display all the geometrical and dimensional details of the joint configuration. Three strongbacks are tacked on the plates to ensure their uniform alignment (Fig. 1c).
In this case study, the SMAW and the GTAW were the two welding processes selected for joining the carbon steel and stainless steel, respectively. Actually, the A283 Gr C carbon steel substrate has an excellent welding performance and a mature welding technology. It can be welded by various welding methods, such as GMAW, SMAW, and SAW. Herein, SMAW process was used thanks to its high productivity and its low production cost. Meanwhile, the SA 240 type 316L clad layer has a larger thermal expansion coefficient and a smaller thermal conductivity compared to the substrate. In order to reduce the residual stresses of the welded joint, An et al. [11] have shown that both GTAW and GMAW processes can be selected.
In addition, these authors also showed that GTAW process was the most suitable for welding clad layer since it is characterized by a low dilution rate and low current [11]. In this context, a comparative study was performed by Kumar et al. [21] to investigate the effect of both welding processes on the mechanical properties of the welded stainless steel 316L plates. These authors proved that the welded joint performed by GTAW process exhibits better mechanical properties compared to the welded joint performed by GMAW process. For this reason, the GTAW process was selected in this study to weld the clad layer of the bi-material plates.
Depending on the materials to be welded, atmospheric gases such as nitrogen, oxygen, carbon dioxide, and water vapor may reduce the weld quality. Hence, an external pure argon was used with a flow rate of 13 l/min on GTAW process in order to surround and protect the weld, whereas the SMAW process provides its own shielding system via a slag coverage using the flux coating electrode.
Welding was carried out in uphill position (3G). Three-filler metals E7018, ER316L, and ER309L were chosen according to ASM International Handbook Vol.06 [22] and AWS Standards (AWS B2.1-1-016-94R [23] and AWS B2.1-8-024 [24]) to weld the low carbon steel (A283 Gr C), austenitic stainless steel (SA 240 type 316L), and the transition zone, respectively. Typical chemical compositions of these filler metals are mentioned in Table 1. It is noted that E7018 was baked at 350 °C for 1 hour and then preserved in a holding oven at 150 °C, in heated quiver, before being issued to the welder. The purpose of this conservation is to ensure that they are adequately dry before launching on the welding process.
The welding was carried out in accordance with ASME Section IX [20]. Nine passes were performed as follows: Three passes on the carbon steel side were performed using the SMAW process, whereas two passes in a transition phase and four passes on the stainless steel side using both GTAW process. Figure 2 illustrates the schematic view of welding bead layers on hot-rolled cladding steel. Since SMAW and GTAW are basically manual processes, the welder’s skill seems to be important to achieve a good welded bead. A qualified welder was therefore selected to perform the welding process. Filler metals were consumed during welding process. Consequently, the replacement of the consumed electrode is required. Cleaning the welding area from slags and impurities seems to be mandatory for each filler metal replacement to get a homogeneous defect-free welded bead. This operation occurred from one pass to another and before starting the next bead as well. The root (first) pass weld, on carbon steel side, was carried out using Ø2.5 mm electrode. Grinding operation for weld recovery and strongbacks removal were performed during this pass. On the same steel side, the filling and covering (i.e., last pass on the carbon steel side) passes were carried out using Ø3.2 mm electrode. Filling and covering passes were carried out using Ø2.4 mm electrode on the stainless steel side.
In the case of multi-pass welding, the interlayer cooling time is an important factor that reduces the heat accumulation and decreases consequently the distortion of the coupon test. Lee et al. [25] and Bandari et al. [26] proved that reducing in cooling time between deposited layers may reduce the distortion. Nevertheless, this fact cannot be applied in the case of the austenitic stainless steel since they possess relatively a low thermal conductivity compared to the carbon steel. Actually, a short interlayer cooling time lead to a low dissipation of the accumulated heat in the welded joint that can result more distortion on the welded joint and can also affect the microstructure (formation of chromium carbide at grain interface). In this context, Bandari et al. [26] and Fessler et al. [27] reported that increasing the interlayer cooling time for the austenitic stainless steels and the nickel-base INVAR alloys decreases the distortion in the welded coupon. For this reason, in order to reduce the distortion and to avoid the presence of carbide in the vicinity of the welded joint, a cooling time was allowed after each pass according to the industrial codes [20, 28, 29]; i.e., the subsequent pass can be initiate only when the highest temperature of the welded joint reaches 150 °C (inter-pass temperature). In this study, the inter-pass temperature was controlled using infrared thermometer Fluke®566. In addition, due to the absence of a seam tracking system, all welding steps were supervised and controlled by a CSWIP welding inspector in order to ensure a good quality of the welded joint.
During each pass, the voltage (U) and current (I) were measured during the welding process using a voltmeter and an ammeter connected to the weld circuit. The welding duration was recorded for each pass, and the welding speed was calculated (v) using the following relationship (Eq. (1)):
All these parameters lead to calculate the heat input using the following formula (Eq. (2)):
Depending on the welding process and the filler metal diameter, the voltage and the current were fixed with the ranges defined by the manufacture datasheet. The welding parameters during each pass are given in Table 2.
Eight K-type (chromel-alumel) thermocouples, with Ø 6 mm and a standard accuracy of ± 2.2°C [30], were used to measure the transient temperature distribution during welding. These thermocouples are positioned as shown in Fig. 3 in such a way that the temperatures’ evolution at the different directions (longitudinal, transversal, and thickness) could be recorded. For this reason, eight parts with dimension of 13 mm × 25 mm × 10 mm were drilled and threaded and then were placed and spot welded on the test coupon plate. The thermocouples were placed in each threaded hole and fixed by bolts. Figure 4 displays the attachment of the thermocouples on the test coupon. Then, those thermocouples are connected to an acquisition card DaqPro® in order to measure the temperature evolution during the welding. The temperature readings are useful to track the evolution of the temperature versus time.
In order to evaluate the welded joint performance, a preliminary study of the mechanical properties, i.e., tensile and bend tests, was carried out. Transversal tensile specimens were extracted from the test coupon and were prepared according to the ASME IX [20] in order to evaluate the transverse tensile properties. All dimensional details are illustrated in Fig. 5. Tensile tests were carried out at room temperature using universal testing machine (UTM®) with a capacity of 300 kN. Experiments were conducted with a crosshead speed of 10 mm/min. In addition, four side bend test specimens were prepared according to the ASME IX [20] in order to determine the degree of soundness and ductility of the welded joint. All dimensional details are displayed in Fig. 6. The bend specimens were placed in three-point bend universal testing machine. The distance between the two bottom rollers was fixed at 60 mm, and the top roller is centered in the middle of the bend specimens welded area. During the experiment, the specimens were side bent till 180°, and then, bent surfaces were evaluated.
3 Results and discussion
In this experimental study, the welding was performed according to the experiment setup described above. Upon achieving the thermal cycle, three metallurgical zones were observed in the plate: the base metal zone (BM), the heat-affected zone (HAZ), and the welded metal zone (WM). The macroscopic cross section, displayed in Fig. 7, illustrates the three metallurgical zones.
In a single pass welding, the peak temperature and the cooling rates that follow the heating determine the HAZ structure, while the thermal gradient, solidification rate, and cooling rate at the boundary (liquid-solid) determine the WM zone solidification structure. The HAZ can be divided into a number of sub-zones (coarse grain, fine grain, and intercritical grain).
The microstructure types and width of the sub-zones are determined by the heating and cooling cycles due to the thermal properties of the material and the arc movement. In a multi-pass welding, the HAZ microstructure evolution becomes very complicated because of the reheating of the underlying microstructure. This not only influences the grain size of the welded bead but also can affects its strength. Thus, in order to acquire a good insight of the HAZ, the study of the temperature evolution and cooling rate during the welding process becomes crucial. In this manuscript, three main points were detailed: (i) a thorough investigation of the temperature evolution during the welding of the selected stainless clad steel material was carried out, followed by (ii) a detailed post welding distortion analysis (iii) followed by a study of the tensile and bend mechanical properties of the welded joint. The metallurgical investigation, however, was not detailed in this paper as it is not within the scope of this study.
3.1 Analysis of welding temperature evolution during welding
During the experiment, the welding thermal cycle (WTC) of each thermocouple was recorded. Each WTC showed a temperature variation as a function of the welding time. Figure 8 shows the WTCs of root and third welding passes during the SMAW process. This figure shows an abrupt decrease in temperature. This might be the result of either the grinding operations, filler metals switch, or alignment strongbacks removal as indicated in Fig. 8a. In addition, when the heat source moves, the measured temperature at a certain point increases until it reaches a maximum value. As soon as it moves away from this point, it decreases. Moreover, the same figure shows, as expected, that the thermocouples 1, 2, 6, and 7 have the highest temperature peaks compared to the thermocouples 3, 4, and 5. This fact might be explained by the locations of thermocouples 1, 2, 6, and 7, which are the closest to the weld bead. This result can be confirmed by the next figure (Fig. 9) where the WTCs along longitudinal direction were recorded. However, since the peak temperature decreases when the source moves away from the weld centerline, the temperature evolution along a transversal direction was studied. Figure 10 shows that WTC of the thermocouple 2 was the first to reach its maximum followed by the other thermocouples respectively. Likewise, the peak temperature of thermocouple 3 is smaller than that of thermocouple 2, and this is representative of the other thermocouples. This is obviously due to the material thermal diffusivity since the heat transmitted through a material by conduction is referred to its thermal conductivity. The findings of our experimental study are in line with those of Murugan et al. [31] who studied the temperature distribution during multi-pass welding of AISI 304. Besides, temperature evolution along thickness was investigated. The peak temperatures of thermocouples 6 and 8 present variations in both phasing and peak temperatures values as illustrated in Fig. 8. In order to understand these variations, thermocouples 6 and 8 WTCs are plotted separately during root, third, and fourth passes as shown in Figs. 11 and 12.
Figure 11a shows that the two peaks are in phase at the root pass. Nevertheless, the peak temperature of thermocouple 6 is higher than that of thermocouple 8 with a small difference in maximal temperatures. This is probably due to the thermal conductivity and thermal diffusivity of the stainless steel. Actually, it should be noted that the thermal conductivity of stainless steel is about 30% less than that of carbon steel as described in ASM International Handbook Vol.01 [32]. Contrariwise, Fig. 11b shows that the two peaks are not in phase and that the difference in peaks temperatures during the cover pass is higher than that of the root pass. These differences are probably due not only to the unequal distance between the third welded bead layer and the two thermocouples but also to the thermal conductivity and thermal diffusivity of the bi-material. For a further understanding of the thermal conductivity impact, the WTCs of the same thermocouples during the fourth pass were plotted. Figure 12 shows that, despite the small distance between the fourth welded bead layer and thermocouple 8, the peak temperature in thermocouple 6 is higher than that of thermocouple 8. This is probably due to the argon used in GTAW process, as well as the thermal conductivity of clad material. Actually, argon has a lower thermal conductivity rate which affects the ability of the gas to transfer the thermal energy.
3.2 Welding distortion analysis
Because of the imminent post welding heat effects, some dimensional changes took place. Hence, the main distortions caused by the residual stresses, and which could modify the original shape of the materials, are angular distortion, longitudinal shrinkage, and transversal shrinkage. These distortions are described in the ASM International Handbook Vol.06 [22] and represented schematically in Fig. 13.
The angular distortion and the longitudinal shrinkage are shown in Fig. 14. Indeed, the rise and fall in temperature during welding, as previously shown in Fig. 8, cause a change in volume due to the thermal expansion phenomenon at the fusion zone. Nevertheless, the welded metal tends to contract during the cooling phase until it reaches the room temperature. The free contraction is restricted by the coldest adjacent base metal. Thus, internal stresses are developed within both the weld and the adjacent base metal until the elastic limit is reached. Therefrom, the welded bead deforms and adjusts to the final volume at ambient temperature.
In ordinary cases, it is obvious that angular distortion occurs after each multi-pass welding. A schematic view was provided in order to study the angular distortion during the butt welding process qualitatively. T*0 and T*h, in Fig. 14, are the temperatures on the top and bottom surfaces, respectively. During each pass, the points near the top surface drift towards the weld centerline at a greater extent compared to the points on the bottom surface causing, therefore, a distortion on the top surface. This is due to the high temperature of T*0. The evolution of the angular distortion value depends on a number of factors such as HI [33]; number of passes [34]; welding sequence and direction [35]; and bead shape [36] among others.
In our case study, the angular distortion (β), with a value of 9.1 °C, is observed on the thin clad layer side (Fig. 15). This angular distortion is calculated as shown in Fig. 16 and described in the work of Manurung et al. [37] using the following relationship (Eq. (3)):
where β is the angular distortion, dZ is the displacement in z direction, and L is the distance.
In fact, the welding of the test coupon during passes number 1, 2, and 3 is similar to the ordinary cases. Indeed, the peak temperature of Th6 (corresponding to T*0) is greater than Th8 (corresponding to T*h) as already shown in Fig 11. Consequently, an angular distortion occurred on the carbon steel side. However, during the fourth pass, the temperature gap between peak temperatures measured by Th6 and Th8, shown in Fig 12, decreases compared to their values observed in Fig 11. From the fifth pass, the peak temperature of Th8 has become highest and therefore the angular distortion adjusts, to the stainless steel side. Figure 17 illustrates the Th6 and Th8 WTCs during the fourth and fifth passes, whereas Fig. 18 represents a schematic angular distortion evolution during the welding.
The angular distortion on the stainless steel side can be due to several factors. Firstly, the thermal expansion coefficient may be the origin of the observed angular distortion. Actually, as reported in the ASM International Handbook Vol.06 [22], the stainless steel thermal expansion coefficient is greater than that of the carbon steel. This result may be confirmed by the empirical relation (Eq. (3)) [34]:
where T is temperature of the material softening, γ is the thermal expansion coefficient, and θ is the groove angle. This relationship affirms that the higher the expansion coefficient is, the more the angular distortion increases.
Secondly, the required heat to melt the clad layer, at equal volume, is higher than that required to melt the carbon steel resulting in greater the residual stresses on the stainless steel side.
Moreover, the volume of the molten zone (deposed metal ER309L+ER316L+ great portion of the root pass) on the stainless steel side, shown in Fig. 19, is greater than that of the molten zone (passes number 2 and 3 using E7018) on the carbon steel side with a proportional V2≈1,2 × V1. Since the volume of V2 is greater than that of V1, the residual stress seems to be greater on stainless steel side generating the observed angular distortion on the clad layer side.
Furthermore, the number of passes on the stainless steel side can be at the origin of the observed result. Indeed, compared to the carbon steel side (three passes), an excessive heat was applied on the clad layer side due to the number of passes (six passes) ending up in an angular distortion on the stainless steel side.
3.3 Mechanical properties of the welded joint
3.3.1 Tensile test
The transverse tensile strengths of the specimens have been evaluated. The typical obtained tensile curves are shown in Fig. 20. The mechanical properties, namely, tensile strength, yield strength, and elongation, are presented in Table 3.
One of the significant outcomes of these tensile tests is that the two specimens were fractured out of the welded joint area (i.e., failure is localized in the BM far about 4 cm away from the welded joint). Additionally, it is observed from the Table 3 that the tensile properties of the welded clad material are higher than that of the tensile properties of the unwelded clad material.
These results show that the WM is more resistant than the base clad material, which confirm the ASME IX requirement [20]. Figure 21 shows a fractograph of the broken specimen after the tensile test. The fractograph reveals a mixed shear dimple. The dimples, which correspond to the micro-voids characteristic of monotonic ductile fracture, appear on the most of the fractured surface. Although the shear fracture occurs along the shear fracture direction at an angle near 45° to the tensile axis, the shear fracture mode is particularly dominant on the clad stainless steel and on the two carbon steel corners (Fig. 21).
3.3.2 Bending appearance
Bending tests were applied on the four side bend specimens. Figure 22 shows the typical macrostructure of the samples after the bending test. The result indicates that no separations, fractures, or tearing were observed on all bent surfaces. These findings are completely in compliance with the industrial code ASME IX [20]. However, a bulging phenomenon appears in the weld area after bending. This phenomenon can be caused by the presence of a local hardening zone (LHZ) with low plasticity. Li et al [38] reported in their work that the LHZ, which was found on the outer surfaces of the side bend specimens and which underwent tension stress state, is bulged due to its high hardness and low plasticity. These authors also affirm that the LHZ was formed due to the presence of a martensitic structure. Dhib et al. [9] considered that the LHZ appeared in the transition phase when they used the filler metal 309L. They also reported that the highest value of the microhardness measured on the transition phase 309L can reach 300 HV.
4 Conclusion
In this manuscript, the effect of the multi-pass welding process on the stainless steel clad plate joint was investigated. The temperature distribution along longitudinal, transversal, and thickness directions was studied during the welding process using several thermocouples fixed on the plates. Then, the longitudinal shrinkage and the angular distortion generated during the welding process by the effect of the heat fluxes were examined after cooling. An angular distortion of 9.1° and a longitudinal shrinkage of 8 mm were, respectively, measured on the welded coupon. These distortions could have been generated by the residual stresses during the welding process. Owing to the great heat concentration provided during the welding process, the areas near the weld centerline underwent severe thermal cycles, thereby generating inhomogeneous plastic deformation and residual stresses on the welded coupon that change in accordance with the welding pass number. Results show that despite the large thickness of the substrate (carbon steel), the angular distortion obtained after the welding process occurred on the thin clad layer side. This phenomenon can be attributed to:
-
(i).
The higher thermal expansion of the stainless steel clad layer compared to the substrate made by carbon steel.
-
(ii).
The required heat degree to melt the austenitic stainless steel which is, at equal volume, higher than that needed to melt the substrate material.
-
(iii).
The amount of filler metal deposited on the clad layer side is greater than that on the substrate side.
-
(iv).
The number of passes used on the clad layer which is greater than that used on the substrate.
In order to evaluate the reliability of the stainless steel clad plate joint after the welding process, tensile and bend mechanical tests were carried out using different specimens extracted from the welded coupon. The tensile tests results indicate that the specimens were fractured at the base metal far about 4 cm away from the welded joint. In addition, the examination of the fractured surfaces revealed the presence of dimples that characterize monotonic ductile fracture. The examination of the bent specimen surfaces after bending revealed no sign of crack or tear. However, a bulging phenomenon was observed on the welded joint bent surfaces that proves the presence of a local hardening zone with a low plasticity.
In light of the reached outcomes, numerical simulations of the studied multi-pass welding process of the stainless clad steel plates may be a useful tool to predict the values of the residual stresses and distortion of the welded joint not only after the weld cooling but also between the different weld passes. The recorded temperature during the process may serve as a database for the numerical model validation.
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The authors would like to thank SOCOMENIN Company for their support. They equally would like to thank Mr. M.T. Hbaieb and A. Badri, staff engineers at SOCOMENIN Company, for their knowledgeable help and support.
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Ghorbel, R., Ktari, A. & Haddar, N. Experimental analysis of temperature field and distortions in multi-pass welding of stainless cladded steel. Int J Adv Manuf Technol 113, 3525–3542 (2021). https://doi.org/10.1007/s00170-021-06788-y
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DOI: https://doi.org/10.1007/s00170-021-06788-y