Experimental Study of the Influence of a Trailing Heat Sink on the Welding Residual Stress Distribution

2006 ◽  
Vol 524-525 ◽  
pp. 479-484 ◽  
Author(s):  
E.M. van der Aa ◽  
M.J.M. Hermans ◽  
I.M. Richardson ◽  
N.M. van der Pers ◽  
Rob Delhez
Keyword(s):  
Residual Stress ◽  
Heat Sink ◽  
Welding Residual Stress ◽  
Stress Distributions ◽  
X Ray Diffraction ◽  
Plate Structures ◽  
X Ray ◽  
Buckling Stress ◽  
Transverse Stresses ◽  
Insight Into

It has been shown that the introduction of a trailing heat sink following a welding heat source at a short distance can reduce or even eliminate the buckling deformation of welded thin plate structures. To increase the insight into the stress development during welding with a trailing heat sink, residual stress measurements were carried out by means of laboratory X-ray and synchrotron X-ray diffraction techniques. Both the laboratory X-ray and the synchrotron X-ray experiments show a difference between the residual stress distributions for the cooled and the uncooled samples. The longitudinal stresses show a reduction in the compressive stress level towards the plate edges, to a level below the critical buckling stress. The transverse stresses are drastically reduced when the active cooling is applied.

Study of residual stresses in A7N01 aluminum alloy with X-ray diffraction Debye ring analysis

2019 ◽  
Vol 33 (01n03) ◽  
pp. 1940032 ◽  
Author(s):  
Pengfei Zhu ◽  
Guoqing Gou ◽  
Zhaofu Li ◽  
Minhao Zhu ◽  
Zhongyin Zhu ◽  
...  
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Welded Joints ◽  
Welding Residual Stress ◽  
Test Results ◽  
X Ray Diffraction ◽  
X Ray ◽  
Debye Ring ◽  
Size Stability ◽  
Ring Analysis

The welding residual stress has different effects on the mechanical properties of aluminum alloy welded joints, such as size stability, fatigue strength and stress corrosion cracking. Therefore, it is very important to evaluate the welding residual stress accurately. In this paper, the residual stress of A7N01 aluminum alloy welded joints was measured by X-ray diffraction. In contrast to the traditional method, the cos[Formula: see text] method was used in this paper, the results were compared with those obtained by the conventional [Formula: see text] method. In addition, the influence of oscillation unit on the test results of the cos[Formula: see text] method was studied.

Characteristics of Residual Stress in P92 Steel Welds

2007 ◽  
Vol 26-28 ◽  
pp. 1175-1180
Author(s):  
Keun Bong Yoo ◽  
Hyun Sun Choi ◽  
Eui Hyun Kim ◽  
Jae Hoon Kim
Keyword(s):  
Residual Stress ◽  
Compressive Residual Stress ◽  
Diffraction Method ◽  
Welding Residual Stress ◽  
Distribution Characteristics ◽  
X Ray Diffraction ◽  
P92 Steel ◽  
X Ray ◽  
Steel Welds ◽  
Directional Difference

Welding residual stress has important influence on the performance of engineering components. In this paper, the residual stress and FWHM were measured by X-ray diffraction method to investigate characteristics for P92 steel welds. The aim of the study is to estimate the residual stress and FWHM distribution characteristics. A compressive residual stress distributed as a function of depth has a different pattern in welds and base metal. A large tensile residual stress occurs welds and near the HAZ, but approaches gradually zero as away from the welding center. Residual stress and FWHM undergo rapid relaxation after PWHT. Also, FWHM is a scalar quantity without any directional difference and is proportional to hardness on the whole.

Analysis of Welding Residual Stress on Cracked Vessels with X-Ray Diffraction Method

2014 ◽  
Vol 937 ◽  
pp. 318-323
Author(s):  
Jun Ming Zhou ◽  
Yi Liang Zhang
Keyword(s):  
Residual Stress ◽  
Good Condition ◽  
Diffraction Method ◽  
Welding Residual Stress ◽  
High State ◽  
X Ray Diffraction ◽  
Light Hydrocarbons ◽  
X Ray ◽  
Heat Treated ◽  
The Impact

A large number of cracks are found in the 1500m3Liquefied Light hydrocarbons vessel during the inspection after two years of running.In totally,six vessels being fully heated treated is made of 15MnNbR. Researchers used X-ray stress analyzer measured the welding residual stress of vessels that have been cracked and uncracked. The results show that, residual stress of uncracked spherical vessels are in good condition, while those value of cracked is high, the value of the highest is 1.05σs. It indicates that the possible reason for the separation is the residual stress in the high state. Through welding and heat treated for the second time, the welding residual stress decreased obviously. It indicates the impact of this measure is good.

scholarly journals Residual Stress Distribution Caused by Laser Hardening and Conventional Quenching in Plain Carbon Steel

2014 ◽  
Vol 996 ◽  
pp. 538-543 ◽  
Author(s):  
Adám Filep ◽  
Márton Benke ◽  
Valéria Mertinger ◽  
Gábor Buza
Keyword(s):  
Residual Stress ◽  
Carbon Steel ◽  
Stress Distribution ◽  
Plain Carbon Steel ◽  
Laser Hardening ◽  
Stress Distributions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Measured Stress ◽  
The Relationship

Heat transfer during laser hardening occurs from the surface towards the bulk in contrast to conventional quenching, where it occurs from the bulk towards the surrounding. The residual stress distributions due to laser hardening and conventional quenching of plain carbon steel samples were measured using X-ray diffraction. The effect of changing the treatment parameters, that is laser power and feed rate, was examined on the resulting stress distribution. The relationship between the measured stress distribution and the evolved microstructure is established.

Development of Weld Residual Stress Measurement Method for Primed Steels

2017 ◽  
Author(s):  
Y. P. Yang ◽  
R. Dull ◽  
T. D. Huang ◽  
H. Rucker ◽  
M. Harbison ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stress Measurement ◽  
Hole Drilling ◽  
Stress Distributions ◽  
X Ray Diffraction ◽  
Ship Structures ◽  
X Ray ◽  
Hole Drilling Method ◽  
Weld Residual Stress ◽  
Drilling Method

Welding, as a major manufacturing process in shipbuilding, induces residual stress and distortion that affects buckling strength, fatigue performance, corrosion resistance, and dimensional stability of ship structures. Understanding residual stress in ship structures is required in engineering design to ensure structural strength and safety and is essential in dimensional accuracy for distortion control during fabrication. However, measuring residual stress in ship structures presents unique challenges, such as structure complexity, surface primer, and a non-friendly measurement environment. Fortunately, portable X-ray diffraction equipment has been successfully developed and proven accurate in other industries to measure residual stress. This study is to evaluate the feasibility of measuring residual stress in a shipyard environment in terms of accuracy and adaptability. Typical welded joints (butt joint and T-joint) were selected for evaluation instead of evaluating complicated ship structures. The welded joints were fabricated using common shipyard welding procedures. This makes the evaluation easier since weld residual stress distributions and magnitudes on these joints are well understood. In addition, the hole-drilling method was also used to validate the X-ray diffraction results. Measured results show that X-ray diffraction can penetrate the pre-construction surface primer used in shipbuilding to directly measure residual stress of the metal surface, without the need to remove the surface primer. The residual stress data measured by X-ray diffraction agreed with the data obtained by the hole-drilling method. In addition, the residual stress trend measured by X-ray diffraction agreed with the theoretical residual-stress distributions. This study concluded that a portable X-ray diffraction is a potential technology for residual stress measurement in a shipyard.

scholarly journals Statistical analysis of the reproducibility of residual stress measurements in cold extruded parts

2021 ◽  
Author(s):  
Fabian Jaeger ◽  
Alessandro Franceschi ◽  
Holger Hoche ◽  
Peter Groche ◽  
Matthias Oechsner
Keyword(s):  
Residual Stress ◽  
Statistical Analysis ◽  
Stress Measurement ◽  
Industrial Applications ◽  
Cold Extrusion ◽  
X Ray Diffraction ◽  
Forming Process ◽  
X Ray ◽  
Stress States ◽  
Key Aspects

AbstractCold extruded components are characterized by residual stresses, which originate from the experienced manufacturing process. For industrial applications, reproducibility and homogeneity of the final components are key aspects for an optimized quality control. Although striving to obtain identical deformation and surface conditions, fluctuation in the manufacturing parameters and contact shear conditions during the forming process may lead to variations of the spatial residual stress distribution in the final product. This could lead to a dependency of the residual stress measurement results on the relative axial and circumferential position on the sample. An attempt to examine this problem is made by the employment of design of experiments (DoE) methods. A statistical analysis of the residual stress results generated through X-Ray diffraction is performed. Additionally, the ability of cold extrusion processes to generate uniform stress states is analyzed on specimens of austenitic stainless steel 1.4404 and possible correlations with the pre-deformed condition are statistically examined. Moreover, the influence of the coating, consisting of oxalate and a MoS2 based lubricant, on the X-Ray diffraction measurements of the surface is investigated.

Simulation and Experiment on the Residual Stress in Super-High Speed Grinding

2010 ◽  
Vol 135 ◽  
pp. 238-242
Author(s):  
Yue Ming Liu ◽  
Ya Dong Gong ◽  
Wei Ding ◽  
Ting Chao Han
Keyword(s):  
Residual Stress ◽  
High Speed ◽  
Element Model ◽  
Residual Stress Distribution ◽  
X Ray Diffraction ◽  
Machined Surface ◽  
X Ray ◽  
High Speed Grinding ◽  
Simulation And Experiment ◽  
Cylindrical Workpiece

In this paper, effective finite element model have been developed to simulation the plastic deformation cutting in the process for a single particle via the software of ABAQUS, observing the residual stress distribution in the machined surface, the experiment of grinding cylindrical workpiece has been brought in the test of super-high speed grinding, researching the residual stress under the machined surface by the method of X-ray diffraction, which can explore the different stresses from different super-high speed in actual, and help to analyze the means of reducing the residual stresses in theory.

Problems Associated with Kα Doublet in Residual Stress Measurements

1979 ◽  
Vol 23 ◽  
pp. 333-339
Author(s):  
S. K. Gupta ◽  
B. D. Cullity
Keyword(s):  
Residual Stress ◽  
Silicon Powder ◽  
Lattice Parameter ◽  
Diffraction Peak ◽  
Parameter Determination ◽  
X Ray Diffraction ◽  
X Ray ◽  
Analysis Techniques ◽  
The Difference ◽  
Similar Accuracy

Since the measurement of residual stress by X-ray diffraction techniques is dependent on the difference in angle of a diffraction peak maximum when the sample is examined consecutively with its surface at two different angles to the diffracting planes, it is important that these diffraction angles be obtained precisely, preferably with an accuracy of ± 0.01 deg. 2θ. Similar accuracy is desired in precise lattice parameter determination. In such measurements, it is imperative that the diffractometer be well-aligned. It is in the context of diffractometer alignment with the aid of a silicon powder standard free of residual stress that the diffraction peak analysis techniques described here have been developed, preparatory to residual stress determinations.

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