scholarly journals Material and residual stress improvement in S355 welded structural steel using mechanical and thermal post‐weld treatment methods

2021 ◽  
Author(s):  
Hassan Al‐Karawi
Keyword(s):  
Residual Stress ◽  
Structural Steel ◽  
Treatment Methods

Effect of Fine-Grained Microstructure Induced by Induction-Heating Fine Particle Peening Treatment on Fatigue Properties of Structural Steel (0.45%C)

2014 ◽  
Vol 891-892 ◽  
pp. 1482-1487
Author(s):  
Kazue Murai ◽  
Ryota Toyama ◽  
Jun Komotori ◽  
Kengo Fukazawa ◽  
Yoshitaka Misaka ◽  
...  
Keyword(s):  
Residual Stress ◽  
Fatigue Strength ◽  
Structural Steel ◽  
Grain Refinement ◽  
Induction Heating ◽  
Fine Particle ◽  
Optical Microscope ◽  
Treatment Temperature ◽  
Fatigue Properties ◽  
Fine Grained

To improve the fatigue properties of structural steel, a novel surface modification process which combines high-frequency induction heating (IH) with fine particle peening (FPP) was developed. IH-FPP treatment was performed on the surface of structural steel specimens (0.45%C) at temperatures from 600 to 750 °C, with peening times of 60 and 120 s. To determine the characteristics of the treated surfaces, the microstructure was observed using an optical microscope and a scanning electron microscope. Vickers hardness and residual stress distributions were also measured. The characteristics of fine-grained microstructures were examined by electron backscatter diffraction. Furthermore, in order to investigate the effect of the grain refinement achieved by IH-FPP treatment, rotational bending fatigue tests were performed on treated specimens. Results showed that IH-FPP treatment created fine-grained microstructures beneath the surfaces of steel samples. The average ferrite grain size was 4.06 μm for a treatment temperature of 700 °C, and finally 0.76 μm for 600 °C . This was due to dynamic recrystallization in the processed region. IH-FPP treated specimens exhibited a higher fatigue strength than untreated specimens. As almost no compressive residual stress was measured in the treated or untreated specimens, the increase in fatigue strength resulting from IH-FPP treatment was due solely to grain refinement.

Effect of Plate Thickness and Weld Position on Distortion and Residual Stress of Welded Structural Steel

2011 ◽  
Vol 689 ◽  
pp. 296-301 ◽  
Author(s):  
Muhammad Anis ◽  
Winarto
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Structural Steel ◽  
Plate Thickness ◽  
Welding Process ◽  
Diffraction Method ◽  
Longitudinal Direction ◽  
Major Effect ◽  
Angular Distortion ◽  
Vertical Position

Residual stresses are generated as a result of non-uniform temperature distribution during welding and particularly cooling process during fabrication of the welded parts. Residual stresses have a major effect on the overall performance of a component in service. In this instant, the residual stress in the form of angular distortion is primarily caused by shrinkage on longitudinal and transversal direction. Several single v-butt joints on structural steel plates of SS400 are investigated by using different plate thickness and welding positions (1G and 3G). GMAW method was used in the welding process. Measurement of residual stress was carried out on a plate with the thickness of 16 mm on longitudinal, transversal and normal direction by using neutron diffraction method. Results showed that the angular distortion of the welded plates increase with the increase of plate thickness. Welding by vertical position (3G position) resulted in a bigger angular distortion compared to flat position (1G position). The distribution of residual stress varied between tension and compression residual stress along welded area with the range of -10 mm to 10 mm. Measurement of residual stress on the longitudinal direction has the greatest value among two other directions.

Assessment of residual stress of welded structural steel plates with or without post weld rolling using the contour method and neutron diffraction

2013 ◽  
Vol 213 (12) ◽  
pp. 2323-2328 ◽  
Author(s):  
Daniel F.O. Braga ◽  
Harry E. Coules ◽  
Thilo Pirling ◽  
Valentin Richter-Trummer ◽  
Paul Colegrove ◽  
...  
Keyword(s):  
Residual Stress ◽  
Neutron Diffraction ◽  
Structural Steel ◽  
Steel Plates ◽  
Contour Method

Column behaviour of cold-formed hollow structural steel shapes

1983 ◽  
Vol 10 (1) ◽  
pp. 125-141 ◽  
Author(s):  
T. A. Davison ◽  
P. C. Birkemoe
Keyword(s):  
Residual Stress ◽  
Theoretical Model ◽  
Structural Steel ◽  
Experimental Tests ◽  
Theoretical Research ◽  
Relative Importance ◽  
Cross Sectional ◽  
Heat Treated ◽  
Steel Shapes ◽  
Sectional Parameters

This paper presents a theoretical model describing the column behaviour of cold-formed heat-treated and non-heat-treated hollow structural steel (HSS) shapes. Member cross-sectional parameters in the form of residual stress and yield strength gradients as well as the member initial crookedness are incorporated into the column model. The parameter magnitudes used and their dispositions throughout the model are based on current experimental and theoretical research. The effect and relative importance of these parameters in determining the theoretical column strength is illustrated. The adequacy of the theoretical model in determining HSS column strength is shown by comparing it with the results of experimental tests conducted on full-sized HSS specimens. Finally, design curves for each of the HSS types studied are recommended.

scholarly journals Effect of Welding Residual Stress on Along-Wind Fatigue Life of Welded Joints in Guyed Mast

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Weilian Qu ◽  
Min Wang ◽  
Qiang Zhou
Keyword(s):  
Residual Stress ◽  
Fatigue Life ◽  
Stress Field ◽  
Structural Steel ◽  
Welded Joints ◽  
Welded Joint ◽  
Welding Residual Stress ◽  
Wind Effect ◽  
Induced Stress ◽  
Guyed Mast

On the premise of only considering along-wind effect on guyed mast, the influence of welding residual stress on the fatigue life of welded joints is evaluated in this paper. Since the sum of residual stress and along-wind-induced dynamic stress exceeds the yield strength of structural steel, the effect of residual stress relaxation is included in the numerical analysis. The multiscale finite element analysis of guyed mast is developed in order to capture accurately stress field distribution of welded joint for the “welding-wind-induced” case in which both residual stress and along-wind-induced stress are taken into consideration, and the stress response characteristics at fatigue critical point of welded joints are pointed out. It is found that the “welding-wind-induced” stress field of welded joint can be approximately considered as multiaxial proportional loading state and hence the stress-based von Mises criterion can be adopted to evaluate the fatigue life of welded joints. Based on the S-N curve of stress fatigue life for welded specimens with structural steel commonly used in guyed masts, the fatigue damage of key welded joints is predicted, and as a consequence, the influence of welding residual stress on the fatigue life of welded joints is discussed.

Investigation on Residual Stress Distribution of H-Shaped Steel Section with Heavy Thick Steel Used in High-Rise Structures

2011 ◽  
Vol 374-377 ◽  
pp. 1733-1737
Author(s):  
Yuan Qi Li ◽  
Qi Yan ◽  
Si Sun ◽  
Zu Yan Shen ◽  
Cheng Feng Yu ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Structural Steel ◽  
Reliability Analysis ◽  
Strength Distribution ◽  
Residual Stress Distribution ◽  
National Standards ◽  
Building Structures ◽  
High Rise ◽  
Longitudinal Residual Stress

In recent years, due to its excellent mechanical properties, especially its insensitivity of strength to thickness, high-rise structural steel with high performance and heavy thickness made in china was applied more and more widely in large-span and high-rise steel building structures. However, there are no reasonable design indexes based on design reliability analysis for the new material in relevant national standards. The high-rise structural steel was often used as H-section column with heavy thickness at present, and its residual stress distribution has significant influence on load-carrying capacity, which is one of the critical factors in reliability analysis of elementary members using high-rise structural steel. In this paper, with the block sectioning method, a detailed experimental investigation on the longitudinal residual stress distribution for H-section (H800×800×80×80mm), made from Q345GJ high-rise structural steel with thickness of 80mm is introduced. The contour of residual stress distribution in the whole section based on test was presented, and the regularity of the residual stress distribution of such a section was discussed. Meanwhile, the contour of yielding strength distribution in the whole H-shaped section with heavy thickness was obtained. It will provide some basic data for reliability analysis and further investigation of the structural members using high-rise structural steel.

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