Design and Application of MMM System for Welding Residual Stress Test

2012 ◽  
Vol 566 ◽  
pp. 534-537
Author(s):  
Hai Yan Xing ◽  
Ping Qin ◽  
Yan Min Lou
Keyword(s):  
Residual Stress ◽  
Stress Concentration ◽  
Stress Test ◽  
Object Oriented Programming ◽  
Welding Residual Stress ◽  
Testing System ◽  
Magnetic Memory ◽  
X Ray ◽  
Analysis And Evaluation ◽  
Examination Result

In order to apply metal magnetic memory (MMM) technology to welding residual stress testing, the MMM hardware and software system is designed. The software subsystem is based on object-oriented programming and the hardware subsystem is portable. The MMM system can test the welded joint residual stress distribution, residual stress concentration zones and defects at workshop. Moreover, the MMM testing system can output data to a computer not only for automatic evaluation but also for further analysis and evaluation with expert intervention. According to the trend of the MMM characteristic, the welding residual stress concentration and defects can be detected and evaluated. The field X-ray examination result is consistent with the result of the MMM testing system, which has proved the accuracy and engineering practicality of the MMM testing system.

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.

Surface Treatment Effect on Measurement of Welding Residual Stress Using X-Ray Stress Analyzer

2013 ◽  
Vol 631-632 ◽  
pp. 617-621 ◽  
Author(s):  
Zhu Wu Zhang ◽  
Qin Yao ◽  
Ai Ping Wu ◽  
Ling Zhu Gong
Keyword(s):  
Residual Stress ◽  
Pressure Vessel ◽  
Measurement Errors ◽  
Scientific Basis ◽  
Welding Residual Stress ◽  
Test Plate ◽  
Welding Seam ◽  
X Ray ◽  
Stress Changes ◽  
Theory Calculation

The effects of welding residual stress (WRS) would be harmful to safety and intensity of pressure vessel. X-ray stress analyzer (XRSA) can be used to non-destructively quantitative analyze WRS. In this study, stress changes of constant stress beam in loading process were tested using strain gauge (SG), strain rosette (SR) and XRSA, and their test results were compared to analyze measurement errors of XRSA. It was found that the property of XRSA meets the experimental requirement. The machining stress in surface of welding test plate could be completely removed after 4 min electrolytic polishing under 1 A current and 100% NaCl electrolyte. The WRS of welding test plate was tested by XRSA after machining stress completely removed, and its distribution along vertical welding seam direction corresponded with theory calculation. Furthermore, XRSA as a non-destructive method will be more used to study WRS of pressure vessel, so these results can provide scientific basis for the studying.

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 Effect of Ultrasonic Impact Treatment (UIT) on Fatigue Strength of Welded Joints

2014 ◽  
Vol 996 ◽  
pp. 736-742 ◽  
Author(s):  
Tamaki Suzuki ◽  
Teppei Okawa ◽  
Hiroshi Shimanuki ◽  
Tetsuro Nose ◽  
Noriaki Ohta ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stress Concentration ◽  
Welded Joints ◽  
Diffraction Method ◽  
External Stress ◽  
Experimental Investigations ◽  
X Ray Diffraction ◽  
Surface Residual Stress ◽  
Ultrasonic Impact Treatment ◽  
X Ray

Ultrasonic impact treatment (UIT) is a remarkable post-weld treatment, which reduce not only in external stress concentration, but also in residual stress in a welded joints. Internal and surface stresses were investigated on UIT treated welded joints by neutron and X-ray diffraction method. This paper discuses the effect of internal and surface residual stress and surface stress concentration after UIT on fatigue resistance by the comparison of fatigue experiments to predictions calculated with the results of the experimental investigations.

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.

Development of Magnetic Memory Testing System Used on Defect Detection of Drill Pipe

2010 ◽  
Author(s):  
Wenpei Zheng ◽  
Jianchun Fan ◽  
Laibin Zhang ◽  
Dong Wen
Keyword(s):  
Stress Concentration ◽  
Nondestructive Testing ◽  
Defect Detection ◽  
Drill Pipe ◽  
Ferromagnetic Material ◽  
Oil Field ◽  
Testing System ◽  
Magnetic Memory ◽  
Memory Testing ◽  
Testing Technology

Drill pipe is used in well drilling in oil field. Under the force of tubular columns and pressure of drilling fluids, the drill pipe usually fails in long-term service, which consequently leads to accidents, such as drill pipe twisting off, and causes stagnation of production. So it’s especially necessary to detect defects in drill pipe in time. Traditional nondestructive testing methods, for example, magnetic flux leakage, eddy current and ultrasound, can only detect already formed defects. They do not help detect and evaluate stress concentration zones, which tends to develop into defects. Magnetic memory testing technology is a newly developed nondestructive testing technology. Under the exciting of the magnetic field of the earth, the magnetic status will change in stress concentration zones of ferromagnetic material. Location and study of the stress concentration zones will forecast the defects of ferromagnetic material. Magnetic memory testing system used on defect detection for drill pipe is developed based on this technology. Composition and function of the system is introduced, and application effect is shown. This system will play important part in detection and evaluation for drill pipe in oil field.

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