Optimization of mechanized ultrasonic testing parameters for extended welds

2020 ◽  
Vol 10 (6) ◽  
pp. 574-585
Author(s):  
Nikolay P. Aleshin ◽  
◽  
Nikolay V. Krysko ◽  
Nikita A. Shchipakov ◽  
Leonid Yu. Mogilner ◽  
...  
Keyword(s):  
Welded Joints ◽  
Ultrasonic Testing ◽  
Steel Structures ◽  
Tank Wall ◽  
Wall Structures ◽  
Cylindrical Reflector ◽  
Main Pipelines ◽  
Steel Tank ◽  
Acoustic Contact ◽  
Ultrasound Scattering

The requirements for the speed, pitch and scanning direction, and also for ensuring acoustic contact maintenance and taking into account the anisotropy of rolled products during mechanized ultrasonic testing of extended welds of steel structures are formulated based on the research conducted and the analysis of the literature data on the conditions of diagnostics for main pipelines facilities. The relevance of the work is determined by a large amount of welded joints inspection, including butt and longitudinal pipe welds, casings of pig-trap stations, filters of different application purposes, and steel tank wall structures. The article formulates the general principles of choosing mechanized scanning parameters and shows the need to consider ultrasound scattering indicatrix on various defects. The issues of setting the monitoring parameters are considered, including the possibility of using vertical drilling (vertical cylindrical reflector) for the adjustment and check of the equipment during mechanized scanning.

Features of ultrasonic control of butt welded joints of polyethylene pipes

2020 ◽  
pp. 46-52
Author(s):  
N.P. Aleshin ◽  
D.M. Kozlov ◽  
L.YU. Mogilner
Keyword(s):  
Quality Control ◽  
Welded Joints ◽  
Ultrasonic Testing ◽  
Ultrasonic Inspection ◽  
Mechanical Tests ◽  
Ultrasonic Control ◽  
Lack Of Fusion ◽  
Polyethylene Pipes ◽  
End To End

The reliability of ultrasonic testing (UT) of the quality of welded joints of polyethylene pipelines, made end-to-end with a heated tool, is considered in comparison with mechanical tests and radiography. The greatest detection of solid defects is provided by ultrasonic inspection with the use of chord tipe probes (not less than 90 %). When detecting defects translucent for ultrasound (lack of penetration, lack of fusion, etc.), the reliability decreases to 70÷80 %. Keywords: welding, polyethylene pipeline, quality control, ultrasonic testing, chord tipe probe. [email protected]

Assessment of the quality of spot-welded joints by ultrasonic testing

2006 ◽  
Vol 20 (5) ◽  
pp. 350-354
Author(s):  
A Ambroziak ◽  
Z Koralewicz ◽  
M Korzeniowski ◽  
P Kustron
Keyword(s):  
Welded Joints ◽  
Ultrasonic Testing ◽  
Spot Welded

Model-Based Interpretation of Angle Beam Ultrasonic Testing Signals from Welded Joints

2004 ◽  
Vol 270-273 ◽  
pp. 302-307
Author(s):  
Sung Jin Song ◽  
Hee Jun Jung ◽  
Joon Soo Park ◽  
Young H. Kim ◽  
Hak Joon Kim ◽  
...  
Keyword(s):  
Welded Joints ◽  
Ultrasonic Testing ◽  
Model Based

Metallurgical and Mechanical Features of API 5L X65 Pipeline Steel Weldment

2002 ◽  
Author(s):  
Jang-Bog Ju ◽  
Jung-Suk Lee ◽  
Jae-Il Jang ◽  
Woo-Sik Kim ◽  
Dongil Kwon
Keyword(s):  
Mechanical Properties ◽  
Base Metal ◽  
Welded Joints ◽  
Pipeline Steel ◽  
Steel Structures ◽  
Welding Residual Stress ◽  
Engineering Structures ◽  
Steel Weldment ◽  
Mechanical Factors ◽  
Fracture Performance

Substantial differences amongst metallurgical and mechanical properties of base metal (BM), weld metal (WM) and heat-affected zone (HAZ) occur in general in welded steel structures It is common practice in various engineering structures to evaluate the fracture performance of welded structures by mechanical testing. Especially, the HAZ of steel welded joints shows a gradient of microstructure and mechanical properties from the fusion line to the unaffected base metal. This study is concerned with the effects of metallurgical and mechanical factors on the fracture performance of API 5L X65 pipeline steel weldments, as they are generally used for main natural gas transmission pipelines in Korea. First of all, we investigated the microscopic and macroscopic fracture behavior of the various micro-zones within the HAZ from the viewpoint of metallurgical factors. The effects of mechanical factors such as welding residual stress in steel weldment and strength mismatch between BM and WM, particularly in high strength steel weldments, are also analyzed. Therefore, the fracture performance of API 5L X65 pipeline steel weldment was mainly dependent on the change of macrostructure and its distribution in the welded joints.

Features of the Heating Process in Ultrasonic Welding of Polycarbonate Products under Independent Pressure

2020 ◽  
pp. 54-62
Author(s):  
S.S. Volkov ◽  
A.L. Remizov ◽  
A.S. Pankratov
Keyword(s):  
Welded Joints ◽  
Welded Joint ◽  
Welding Process ◽  
Ultrasonic Welding ◽  
Heating Process ◽  
Mechanism Of Formation ◽  
High Quality ◽  
Acoustic Contact ◽  
Welding Pressure

This paper presents a mechanism of formation of a hard-to-weld polycarbonate joint by ultrasonic welding. The method utilizes internal and external friction occurring in the welded joint area on abutting surfaces due to shear vibrations of the end of the upper part relative to the lower part. A layer of the heated welded material is formed, localized by thickness, in which predominant absorption of the ultrasonic vibrations occurs, which allows one to obtain high-quality and durable welded joints without significant deformation due to the concentration of thermal energy in the welding zone. The effect of independent welding pressure on the strength of the welded joint of polycarbonate is considered. A new method of ultrasonic welding under the conditions of independent pressure is proposed. The method consists of dividing the static welding pressure into two components: the pressure of the acoustic contact in the zone of contact of the waveguide with the product, and the welding pressure that compresses the welded products, with the latter component being lower than the former. In order to obtain high-quality welded joints made of polycarbonate and to prevent displacement of the welded edges during the welding process relative to each other, a special preparation of the welded edges is developed, which allows one part to be moved vertically relative to the other during the welding process. It is established that the quality of welding depends on the speed of movement and the angle of cutting the edges.

Determination of Dynamic Characteristics of Welded Joints Made of Steel S460NL

2014 ◽  
Vol 224 ◽  
pp. 267-275 ◽  
Author(s):  
Wiesław Barnat ◽  
Marek Kordys
Keyword(s):  
Plastic Deformation ◽  
Dynamic Characteristics ◽  
Welded Joints ◽  
High Speed ◽  
Steel Structures ◽  
Basic Material ◽  
Engineering Structures ◽  
Static Tests ◽  
Very High

Examination of the behavior of materials under very high speed plastic deformation are widely used during the designing process of dynamically loaded steel structures. Steel is widely used as a basic material for designing engineering structures. Characteristics of steel obtained under static experiments are different from those obtained during static tests.

Ultrasonic testing of austenite welded joints in Дy-300 pipelines

2006 ◽  
Vol 42 (10) ◽  
pp. 682-691 ◽  
Author(s):  
A. N. Razygraev ◽  
N. P. Razygraev
Keyword(s):  
Welded Joints ◽  
Ultrasonic Testing
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