INVESTIGATION OF TRANSVERSE CRACKS IN ANNULAR WELDED JOINTS OF MAIN GAS PIPELINES LINEAR PART

2021 ◽  
pp. 34-41
Author(s):  
V. A. Zaznobin ◽  
A. V. Nekrasov ◽  
A. V. Pankratov
Keyword(s):  
Welded Joints ◽  
Linear Part ◽  
Correct Identification ◽  
Gas Pipelines ◽  
Destructive Testing ◽  
Transverse Cracks ◽  
Additional Control ◽  
Non Destructive

Statistics of accidents and incidents on main gas pipelines in recent years indicate that almost half of the technogenic events occur due to depressurization in the area of annular welded joints, mainly joints containing defects made during construction and installation work during the construction of gas pipelines. The assessment of the degree of danger and the timing of external inspection and repair or replacement of defective annular welded joints largely depends on the quality of non-destructive testing, the correct identification of the types of defects and the objective determination of their geometric dimensions. To increase the reliability of the assessment of the degree of danger of the detected defects, it is necessary to use additional control methods, in particular, destructive ones. The paper presents the results of surveys and tests of metal fragments of annular welded joints of main gas pipelines containing transverse cracks of annular welded joints in order to determine the causes of the formation of these defects and to assess the degree of danger of the detected transverse cracks of the installation welds of main gas pipelines.

scholarly journals The Examination of Restrained Joints Created in the Process of Multi-material FFF Additive Manufacturing Technology

2020 ◽  
Author(s):  
Janusz Kluczynski ◽  
Lucjan Sniezek ◽  
Alexander Kravcov ◽  
Krzysztof Grzelak ◽  
Pavel Svoboda ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Acrylonitrile Butadiene Styrene ◽  
Tensile Tests ◽  
Lower Amount ◽  
Internal Quality ◽  
Experimental Production ◽  
Destructive Testing ◽  
Non Destructive

The paper is focused on the examination of the internal quality of joints created in a multi-material - additive manufacturing process. The main part of the work focuses on experimental production and non-destructive testing of restrained joints of modified PLA (polylactic acid) and ABS (Acrylonitrile butadiene styrene) 3Dprinted on RepRap 3D device that works on the "open source" principle. The article presents the outcomes of non-destructive materials test in the form of the data from the Laser Amplified Ultrasonography, microscopic observations of the joints area and tensile tests of the specially designed samples. The samples with designed joints were additively manufactured of two materials: specially blended PLA (Market name – PLA Tough) and conventionally made ABS. The tests are mainly focused on the determination of the quality of material connection in the joints area. Based on the results obtained, the samples made of two materials were compared in the end to establish which produced material joint is stronger and have a lower amount of defects.

scholarly journals Quality Assessment of Road Shoulders using Light Weight Deflectometer and Geogauge

2019 ◽  
Vol 8 (2) ◽  
pp. 3107-3114
Keyword(s):  
Cost Effective ◽  
Standard Test ◽  
Dry Density ◽  
Light Weight ◽  
Destructive Testing ◽  
The Road ◽  
Light Weight Deflectometer ◽  
Non Destructive

Shoulders are an important element of the highways that provide space for vehicles to stop during an emergency. A well-compacted shoulder provides structural firmness to a pavement by transferring overlying traffic loads to the underlying soil stratum. They provide lateral support to the pavement. In recent years, the use of non-destructive testing devices like Geogauge and Light Weight Deflectometer (LWD) has emerged in our country. The main reason behind this is the inbuilt ability of Geogauge and LWD in the fast estimation of the elastic modulus of a shoulder on top of their ease to port, being cost-effective, the capability to give more amounts of data, etc. Thus, there is a need to assess these devices. The main objective of this paper is to develop correlations between the parameter obtained from these non-destructive devices and destructive test parameterslike dry density and CBR. The tests were conducted on thirty-two locations of road shoulders at the city of Patna, India. Geogauge, LWD and sand replacement or sand cone testing were performed at different locations and soil samples were collected for determination of CBR and water content in the laboratory. The result of regression analysis shows that a significant correlation exists between moduli obtained from the devices under investigation and standard test results i.e. dry density and CBR. These developed correlations may be used by the road engineers for assessment of the quality of the shoulders.

scholarly journals Autogenous Fiber Laser Welding of 316L Austenitic and 2304 Lean Duplex Stainless Steels

Materials ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 2930 ◽  
Author(s):  
Michał Landowski ◽  
Aleksandra Świerczyńska ◽  
Grzegorz Rogalski ◽  
Dariusz Fydrych
Keyword(s):  
Fiber Laser ◽  
Stainless Steels ◽  
Welded Joints ◽  
Duplex Stainless Steels ◽  
Bending Test ◽  
Ferrite Content ◽  
Magnetic Method ◽  
Destructive Testing ◽  
Non Destructive

This study presents results of experimental tests on quality of dissimilar welded joints between 316L austenitic and 2304 lean duplex stainless steels, welded without ceramic backing. Fiber laser welded butt joints at a thickness of 8 mm were subjected to non-destructive testing (visual and penetrant), destructive testing (static tensile test, bending test, and microhardness measurements) and structure observations (macro- and microscopic examinations, SEM, element distribution characteristics, and ferrite content measurements). Non-destructive tests and metallographic examinations showed that the welded joints meet the acceptance criteria for B level in accordance with EN ISO 13919–1 standard. Also the results of the destructive tests confirmed the high quality of the joints: specimens were fractured in base material with lower strength—316L austenitic stainless steel and a 180° bending angle was obtained confirming the high plasticity of the joints. Microscopic examination, SEM and EDS analysis showed the distribution of alloying elements in joints. The microhardness of the autogenous weld metal was higher by about 20 HV0.2 than that of the lean duplex steel. Ferrite content in the root was about 37% higher than in the face of the weld. The Schaeffler phase diagram was used to predict the phase composition of the welded joints and sufficient compliance with the magnetic method was found. The presented procedure can be used for welding of 316L–2304 stainless steels dissimilar welded joints of 8 mm thickness without ceramic backing.

scholarly journals Analysis of Using Acoustic Microscopy to Evaluate Defects in Spot Welding Joints

2016 ◽  
Vol 61 (2) ◽  
pp. 1009-1019 ◽  
Author(s):  
M. Korzeniowski ◽  
B. Białobrzeska
Keyword(s):  
Light Microscopy ◽  
Welded Joints ◽  
Spot Welding ◽  
Acoustic Microscopy ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Welding Joints ◽  
Microscopy Techniques ◽  
Non Destructive

AbstractThe article presents the possibilities of using acoustic microscopy to evaluate defects in resistance spot welding joints. For this purpose, the welded joints were made from two grades of aluminium plates EN AW5754 H24 and EN AW6005 T606, which were then subjected to non-destructive testing using acoustic microscopy and conventional destructive testing using traditional light microscopy techniques. Additionally, the study examined the influence of the typical contaminants found in industrial conditions on the quality of the joint.

scholarly journals UNFORMALIZED ASPECTS OF APPLICATION THE NON-DESTRUCTIVE METHODS FOR DETERMINATION OF CONCRETE QUALITY ON ROAD CONCRETE COATINGS

2021 ◽  
pp. 36-45
Author(s):  
V. V. KOLOKHOV ◽  
L.V. MOROZ ◽  
V.L. МОМОТ ◽  
V. V. BYLIK ◽  
S.M. BOHDAN
Keyword(s):  
Concrete Surface ◽  
Concrete Pavements ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Elastic Rebound ◽  
Acoustic Contact ◽  
Non Destructive ◽  
Destructive Methods

Formulation the problem. Experience with the use of non-destructive testing devices shows that theadjustment of calibration dependences in the conditions of damaged concrete surfaces is difficult. Usually quantitativeanalysis is replaced by qualitative, and methods that allow you to return to the quantitative assessment are notstandardized. That is, the adequacy of property definitions needs to be increased. The purpose of the study is todetermine the possibilities of increasing the adequacy in the using of non-destructive testing devices and to study theinfluence of the peculiarities of the technology of manufacturing concrete pavements on the measurement results.Results: It has been performed a visual inspection of the condition of the coating structure on the basis of currentregulations. The study was performed using an ultrasonic device "Novotest IPSM-U" and a device "Onyx 2.5" (shockpulse method). Measurements were performed both on the surface of the concrete pavement and on the samples takenfrom the structure. During the work, project materials and passports for the concrete mixture were used. Conclusions.Studies have shown that: to obtain evidence-based results in the application of non-destructive methods for determiningthe quality of concrete road pavements, existing methods need to be improved and formalized; it needs to be clarifiedand formalized the methods of providing acoustic contact of receivers − transmitters of ultrasonic vibrations with theconcrete surface and the conditions of interaction the indentors with the concrete surface during the implementation ofthe method of elastic rebound; it is necessary to develop and standartize a method for determining the properties of theconcrete mixture based on the properties of concrete.

Determination of neutron image quality of compact collimator facility for non-destructive testing

2021 ◽  
Vol 16 (02) ◽  
pp. P02004-P02004
Author(s):  
T. Chulapakorn ◽  
S. Wonglee ◽  
W. Pornroongruengchok ◽  
T. Liamsuwan ◽  
S. Kotayee
Keyword(s):  
Image Quality ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Neutron Image ◽  
Non Destructive
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