Mechanical properties of steel welds at elevated temperatures

Rezaeian, Abbas; Keshavarz, Mahmood; Hajjari, E.

doi:10.1016/j.jcsr.2019.105853

Cited by 23 publications

(6 citation statements)

References 30 publications

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“…This represents a marginal drop of 2 GPa and implies a 2.29% decrease in the Elastic Modulus of the specimen after welding. The findings are consistent with Rezaeian et al, (2020) who also revealed that After welding, the welded specimens gradually cooled down to ambient temperature. Also, the percentage strain of specimen 'E' before welding and after welding is 3.38% and 6.10% respectively.…”

Section: Impact Strengthsupporting

confidence: 91%

Impact of Electric-Arc Welding on The Mechanical Properties of AISI 1055 Medium Carbon Steel with Varied Gauge Diameters

Afrifa,

Duodu,

Amoanab

et al. 2023

AJAR

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Purpose: This paper investigated through experimentation, the impact of electric-arc welding processes on the mechanical properties of AISI 1055 steel medium carbon steel material with varied gauge diameters. Design/Methodology/Approach: The study used experimental and analytical methods to investigate the impact of electric arc welding on the mechanical properties of AISI 1055 Medium Carbon Steel. The test samples were prepared based on the standards of the American Iron and Steel Institute (AISI), with varied gauge diameters. Standard tensile tests were performed on the samples before welding and after welding, using a computer-interfaced Universal Tensile Testing Machine. Data obtained from the study was analyzed using graphs, tables and charts. Finally, the sets of results for both welded and unwelded specimens were compared to determine the impact that welding has on welded medium carbon steel components and structures. Findings: The data recorded by the computer-interfaced tensile test machine was used to plot and display, the stress-stain graphs for the various sets of samples. The results showed that the welding processes adversely affected the Ultimate Tensile Strength (UTS), Yield Strength, Elastic Modulus and Impact Strength of the samples studied; since all the samples studied had their initial values dropped after undergoing welding and testing. However, the strain of the samples increased after welding. Research Limitation/Implication: Although there are other methods and techniques of welding metals, this study adopted electric arc welding to weld the samples used for the study due to resource constraints. Practical Implication: The findings of this study also bring to the fore, the need for industry regulators to promulgate standards to regulate the welding of medium carbon steel and by extension, other industrial materials to preserve the natural properties of the materials. Originality/Value: This study introduced an important perspective to the testing of engineering materials by varying the gauge diameters (a key determinant of the dimensional specifications of the specimen), to obtain a comprehensive insight into the impact of electric-arc welding on the mechanical properties of the material.

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Section: Impact Strengthsupporting

confidence: 91%

Impact of Electric-Arc Welding on The Mechanical Properties of AISI 1055 Medium Carbon Steel with Varied Gauge Diameters

Afrifa,

Duodu,

Amoanab

et al. 2023

AJAR

View full text Add to dashboard Cite

show abstract

“…While the difference between average outer diameter and the average weld core diameter in the highest heat input and the lowest heat inputs in type G and B electrodes was 2.15 and 2.20 mm, respectively, in series of F type electrode, the nugget size difference in samples with the average highest and the average lowest heat input was 2.40 mm. As is known, the heat input causes a decrease in the modulus of elasticity and yield point in metallic materials and increases its plasticity at temperatures above 600 °C giving a peak at 730 °C [10,11]. Therefore, with increasing current, an increase in core depth and an increase in the outer diameter of the RSW core were observed.…”

Section: Resultsmentioning

confidence: 91%

Effect of Electrode Type and Weld Current on Service Life of Resistance Spot Weld Electrode

Temiz,

Onan,

Cebi

et al. 2024

International Journal of Automotive Science and Technology

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HSLA steels are widely preferred in the automotive industry due to their advantages of high strength, lightening of vehicle weight and formability. The fact that a lot of welding processes are carried out during the creation of the vehicle body has made the welding operations of these steels an important topic. In this study, zinc coated HX340LAD+Z sheet material was welded by RSW application in factory conditions. The welding opera-tion was carried out with different current intensities and 300 spot welds for three different electrodes, keeping the weld duration constant. After the welding trials, the shortening of the electrodes was examined and information about the electrode lifetime was obtained. The weld core diameter was measured on the sheet metal also microstructure and micro-hardness investigations were made. As a result of the findings, information was obtained about weld hardness and collapse. Determination of splashing in the HX340LAD+Z ma-terial was provided by SEM imaging and EDX studies. It was determined that F type Copper electrode was more efficient.

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“…Empirical steel relations presented in European Committee for Standardization (CEN) (2005) are used for the thermal properties. The stress-strain relations for steel and weld at high temperatures were derived based on the reduction factors specified in European Committee for Standardization (CEN) (2005) and Rezaeian et al (2019), respectively. The mechanical and physical properties of the materials are reported in Table 1.…”

Section: Materials Properties At High-temperaturementioning

confidence: 99%

Performance of steel beam with welded top-seat angle connections at elevated temperatures

Rezaeian

Mansoori

Khajehdezfuly

2023

JSFE

Self Cite

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PurposeTop-seat angle connection is known as one of the usual uncomplicated beam-to-column joints used in steel structures. This article investigates the fire performance of welded top-seat angle connections.Design/methodology/approachA finite element (FE) model, including nonlinear contact interactions, high-temperature properties of steel, and material and geometric nonlinearities was created for accomplishing the fire performance analysis. The FE model was verified by comparing its simulation results with test data. Using the verified model, 24 steel-framed top-seat angle connection assemblies are modeled. Parametric studies were performed employing the verified FE model to study the influence of critical factors on the performance of steel beams and their welded angle joints.FindingsThe results obtained from the parametric studies illustrate that decreasing the gap size and the top angle size and increasing the top angles thickness affect fire behavior of top-seat angle joints and decrease the beam deflection by about 16% at temperatures beyond 570 °C. Also, the fire-resistance rating of the beam with seat angle stiffener increases about 15%, compared to those with and without the web stiffener. The failure of the beam happens when the deflections become more than span/30 at temperatures beyond 576 °C. Results also show that load type, load ratio and axial stiffness levels significantly control the fire performance of the beam with top-seat angle connections in semi-rigid steel frames.Originality/valueDevelopment of design methodologies for these joints and connected beam in fire conditions is delayed by current building codes due to the lack of adequate understanding of fire behavior of steel beams with welded top-seat angle connections.

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Mechanical properties of steel welds at elevated temperatures

Cited by 23 publications

References 30 publications

Impact of Electric-Arc Welding on The Mechanical Properties of AISI 1055 Medium Carbon Steel with Varied Gauge Diameters

Impact of Electric-Arc Welding on The Mechanical Properties of AISI 1055 Medium Carbon Steel with Varied Gauge Diameters

Effect of Electrode Type and Weld Current on Service Life of Resistance Spot Weld Electrode

Performance of steel beam with welded top-seat angle connections at elevated temperatures

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