Influence of Restraint Conditions on Welding Residual Stresses in H-Type Cracking Test Specimens

Abstract

From the viewpoint of mechanics, weld cracking tends to occur if the induced tensile stress surpasses a certain value for the particular materials and the welding processes. Welding residual stresses (WRS) can be profoundly affected by the restraint conditions of the welded structures. For estimating the tendency of weld cracking, the small-scale H-type slit joints have been widely used for cracking tests. However, it is still hard to decide whether the real large-scale component can also be welded without cracking even though the tested weld cracking specimens on the laboratory scale can be welded without cracking. In this study, the intensity of restraint which quantitatively indicates how much a joint is restrained is used. The influence of restraint condition (intensity of restraint) on WRS is systematically investigated using both the numerical simulation and the experimental method. The achievement obtained in the current work is very beneficial to design effective H-type self-restrained cracking test specimens for evaluating the sensitivity of the material and the welding procedures for weld cracking in the real large-scale components.

An exact analysis of unsteady MHD free convection flow of some nanofluids with ramped wall velocity and ramped wall temperature accounting heat radiation and injection/consumption

“…These factors have variety of practical utilities in food processing, ventilation, heat treatment and air conditioning 20 . Welding mechanics and thermal engineering deals with addition of heat sources or sinks to free and forced convective MHD flows to optimize the efficiency of cooling and heating processes 21,22 . Heat absorption/generation effects for MHD natural convective nanofluid flow over a vertical plate were reported by Chamkha and Aly 23 .…”

Experimental and Numerical Analysis of 60-Year-Old Sluice Gate Affected by Long-Term Operation

“…Knowledge and consideration of residual stresses is extremely important, especially in welded structures in which they occur mainly due to significant temperature effects in the area around the weld and subsequent uneven cooling. Residual stresses in a structure can arise not only during its production but also during repairs or as a result of possible overload [ 21 , 22 , 23 , 24 , 25 , 26 ]. These stresses are superimposed on stresses from the operating load, which can reduce, sometimes substantially, safety and reliability of the load-bearing element and thus of the entire structure.…”

Effect of Solid-State Phase Transformation and Transverse Restraint on Residual Stress Distribution in Laser–Arc Hybrid Welding Joint of Q345 Steel

“…With the development of steel structures geared toward the large scale and highly parameterized, the boundary restraints of welded joints become more complex [ 14 ]. Sun et al [ 15 ] explored the effect of restraint intensity on the welding RS distribution in H-Type cracking test specimens. Their research showed that the magnitude of the longitudinal RS could be influenced by the restraint intensity only in welded joints with shorter weld lengths.…”