scholarly journals IDENTIFIKASI CACAT LASAN FCAW PADA FONDASI MESIN KAPAL MENGGUNAKAN METODE ULTRASONIC TESTING

2021 ◽  
Vol 5 (2) ◽  
pp. 53-58
Author(s):  
Fauzi Widyawati ◽  
Lino Marano
Keyword(s):  
Weld Metal ◽  
Ultrasonic Testing ◽  
Slag Inclusion ◽  
Incomplete Fusion ◽  
Solid Objects ◽  
Porosity Defects ◽  
The Difference ◽  
Non Destructive ◽  
Welding Position

Ultrasonic testing is one of the non-destructive inspection methods for welding results. The ultrasonic testing method has several advantages, namely it can be used to analyze the position of the defect in the object, both the depth of the defect and the dimensions of the defect, and it is an environmentally friendly method. Physical defects that are in solid objects of course cannot be known from direct vision so it is necessary to carry out an inspection of an object to see whether or not there are defects that occur in solid objects. Ultrasonic testing of the results of FCAW welding on the foundation of the ship's engine. FCAW welding is applied to the foundation with two types of welding positions, namely the overhead position coded P1 and the horizontal position coded P2. The test was carried out using a wave frequency of 4 MHz and using a 0° probe for analysis of defects in the area around the weld metal and a 70° probe for analysis of the weld metal. The tests were carried out using the ASME section V and ASTM E164 standards as the standard for determining defects. The test results at the P1 welding position found two types of defects, namely incomplete fusion defects with five welding points with the longest defect length of 40mm and porosity defects with two points with the longest defect length of 30mm. While the results of ultrasonic testing at the P2 welding position found two types of defects, namely slag inclusion defects with a defect length of 35mm and incomplete penetration defects with a defect length of 20 mm. The conclusion of ultrasonic testing is that the difference in welding positions is that the welding position greatly affects the quality of the welding results. The defects resulting from the welding position also vary.

Numerical Simulation of Radar Velocity Tomography Using SIRT and ART

2014 ◽  
Vol 533 ◽  
pp. 226-229
Author(s):  
Cui Du ◽  
Xin Jun Xu ◽  
Hao Zhang
Keyword(s):  
Land Reclamation ◽  
Layer Structure ◽  
Mine Reclamation ◽  
High Efficient ◽  
The Difference ◽  
Ground Penetrating ◽  
Time And Energy ◽  
Velocity Tomography ◽  
Non Destructive

Layer structure is an important reference basis for evaluating quality of land reclamation. Classical methods like digging profiles cost much time and energy. GPR (Ground Penetrating Radar) is a non-destructive and high-efficient technique. Aiming at the problem that insufficient reflected signal energy using traditional reflection method, tomography can be used in GPR detection for layer structure of mine reclamation soil. A model with four layers with different wave velocity is constructed and both ART and SIRT are employed to solve the inversion equations. The results show agreement with model data, and the difference between layers is clear. This verifies radar tomography technology is practical for detection layer structure of mine reclamation soil. The two algorithms give similar results and ART shows better accuracy while SIRT provides more stable results.

Productivity and Reliability Study of Non Destructive Testing Techniques for Inspection of Structural Welds in Construction Industry

NDT World ◽  
2016 ◽  
Vol 19 (3) ◽  
pp. 35-39
Author(s):  
Чан ◽  
Alan Chan ◽  
Бабу ◽  
Sajeesh Kumar Babu ◽  
Чан ◽  
...  
Keyword(s):  
Construction Industry ◽  
Ultrasonic Testing ◽  
Phased Array ◽  
Flaw Detection ◽  
Slag Inclusion ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Ultrasonic Techniques ◽  
Testing Techniques ◽  
Non Destructive

Introduction. The aim of this study is to evaluate the productivity and reliability of non-destructive testing techniques for the inspection of structural welds employed in the Hong Kong construction industry. Method. Manual ultrasonic pulse echo method and semi-automatic ultrasonic techniques using phased array (PAUT) as well as radiographic testing were employed. Five classes of defects were analyzed: lack of penetration, lack of fusion, crack, porosity and slag inclusion. The tests were carried out on the specimen made from structural plate, on which artefacts were inserted on the weld metal. The results were being studied to compare the defect detection reliability by both ultrasonic techniques. The flaw detection productivity using phased array is also compared with conventional ultrasonic testing at a determined rate. Results. The reliability of PAUT was 100% compared to 96.7% with manual ultrasonic testing, however with the inclusion of defect sizing and tolerance the reliability of manual UT is dropped to 57.4%, which implies there is a chance of 42.6% of improper sizing). PAUT exhibits the reliability of 87.5%. The research will be continued with the aim of determining the most appropriate and reliable NDT methods in each case.

Non-Destructive Evaluation of Composite Pipes and Tanks: Development of Inspection Strategies

2004 ◽  
Author(s):  
Harald Thon ◽  
Bjo̸rn Melve
Keyword(s):  
Ultrasonic Testing ◽  
Visual Inspection ◽  
Practical Experience ◽  
Radiographic Examination ◽  
Visual Examination ◽  
The Public ◽  
Research Programmes ◽  
Composite Pipes ◽  
Non Destructive

The document describes practical experience gained from several research programmes and the use of GRP products both offshore and onshore. An OLF document was compiled during 1990’s and the visual inspection part of the document was used in the ISO 14692, part 4 [12] with requirements and defect criteria. Additional parts on ultrasonic and radiographic examination have been included in the Norwegian standard Norsok M-622 [1]. However, we would like to publish the full version of this document and make it available in the public domain. Some of the methods described is well developed, while others still would require research efforts to make the techniques practical useful. For practical use, the visual examination with failure description, acceptance criteria and corrective actions are most developed. Further, radiography has been useful in several projects in assessing the quality of adhesive joints. The ultrasonic testing is expected to become better to use as the equipments and methods are developing. Every reasonable effort has been made to ensure that this publication is based on the author’s best knowledge. However, no responsibility of any kind for any injury, delay, loss or damage can be accepted for parties using information given herein.

scholarly journals Pengaruh VariasiArus dan Posisi Pengelasan SMAW terhadap Sifat Mekanik Baja ST 37

2021 ◽  
Vol 14 (2) ◽  
pp. 134-139
Author(s):  
Iwan Nugraha Gusniar ◽  
Ahmad Juhri ◽  
Viktor Noubnome
Keyword(s):  
Tensile Strength ◽  
Weld Metal ◽  
Impact Test ◽  
Current Strength ◽  
Steel Plates ◽  
Test Results ◽  
Strong Current ◽  
The Difference ◽  
The Impact ◽  
Welding Position

The purpose of this study was to determine the difference in the value of tensile strength, impact and microstructure test results on ST 37 steel plates due to variations in current strength of 80 A, 85 A and 90 A and 1G, 2G and 3G welding positions. The results of this study show the value of Max.load, current strength of 80 A 3G welding position gets the highest value of 5650 kgf, value of Tinsile strength, current strength of 80 A 3G welding position gets the highest value of 44.78 (kgf/mm2), then the strain value, the current strength of 80 A for the 3G welding position gets the highest value of 0.9% and the value of the modulus of elasticity, the current strength of 80 A for the 3G welding position gets the highest value of 97.94 (GPa,KN/mm2), In the value of the impact test results, the current strength of 80 A is the 1G welding position that gets the highest value, which is 116 Joules. In the observation of microstructure testing, 3 points were carried out, Weld metal, HAZ and Base metal at each strong current

Codes Comparison and Analysis of Weld Cladding Ultrasonic Testing in Nuclear Power Plants

2013 ◽  
Author(s):  
Zhimin Zhong ◽  
Jian Min ◽  
Kai Li
Keyword(s):  
Ultrasonic Testing ◽  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Pressurized Water Reactor ◽  
Destructive Testing ◽  
Pressurized Water ◽  
The Difference ◽  
Weld Cladding ◽  
Non Destructive

This paper briefly introduces the weld cladding structure, its common defects during the manufacture and operation stage and its application in pressurized water reactor nuclear power plants. Some ultrasonic testing codes or standards for nuclear power plant pressure vessel or piping, such as ASME BPVC volume V & III & XI, Germany KTA 3201.3 and 3201.4 code, France RCC-M and RSE-M code, and Russia code of light water nuclear power plants were discussed. The difference of those codes and some feed backs have been analyzed and discussed. Furthermore, these works really benefit the compiling of NB/T 20003.2-2010, Non-destructive Testing for Mechanical Components in Nuclear Island of Nuclear Power Plants-Part 2: Ultrasonic Testing, as China building more and more nuclear power plants. It was concluded that we shall pay more attention to the inspection of cladding, not only at manufacture stage but in operation outage stage. One of important work is periodically updating the inspection standard revision. It was believed that improving the cladding defects inspection reliability and effectiveness is very important to the safety of nuclear power plants operation in China and in the world.

scholarly journals Porosity Defect Analysis in ST 37 Steel Welding Joints Using the Dye Penetrant Method

Teknomekanik ◽  
2020 ◽  
Vol 3 (1) ◽  
pp. 1-8
Author(s):  
Alan Wari ◽  
Hendri Nurdin ◽  
Kyaw Zay Ya
Keyword(s):  
Welding Process ◽  
Quality Standards ◽  
Test Study ◽  
Welding Defects ◽  
Porosity Defects ◽  
Welding Joints ◽  
Dye Penetrant ◽  
Definition Of ◽  
Non Destructive ◽  
Welding Position

The procedures in the world of welding all look simple, but all welding that looks simple must have extensive knowledge in accordance with the definition of welding. This welding is a permanent connection technique, when the welding process takes place the results do not always meet the quality standards that have been determined. The cause of the welding results that do not meet the quality standards in the form of dirt on the material when before welding and so forth. The purpose of this study is that the specimen specimens are accepted according to the welding institute's standard acceptance criteria (TWI) This research uses st 37 steel by using SMAW welding electrodes LB 52U (E 7016) diameter 2.6mm for root, and LB 52U (E 7016) diameter 3.2 for fillers and caping with welding position 1G. Testing of welding results is carried out by the non destructive test of the dye penetrant method whose inspection results are determined based on the standard ASME. The results of this test study discontinuity in the form of porosity on the surface of the welding results in specimen 1, namely material contaminated by dirt, there are porosity defects scattered with a length of 6mm and porosity of 10mm so based on the standard TWI both test specimens were declared rejected, and in specimen 2, material that was not contaminated with impurities, there were porosity defects of 2mm and 2.5mm so that according to the standards of the two specimens the test was accepted. For the results of welding defects that are rejected can still be corrected by linking to the defects that, and can be done welding again.

Letter to the Editor: The Continuing Challenge of Evaluating RSD Impairment and Disability

1998 ◽  
Vol 3 (5) ◽  
pp. 8-10
Author(s):  
Robert L. Knobler ◽  
Charles N. Brooks ◽  
Leon H. Ensalada ◽  
James B. Talmage ◽  
Christopher R. Brigham
Keyword(s):  
Disability Evaluation ◽  
Body Part ◽  
Loss Of Function ◽  
Regulatory Requirements ◽  
Major Cardiac Event ◽  
Clinical Scenarios ◽  
Impairment Score ◽  
Occupational Activities ◽  
The Difference

Abstract The author of the two-part article about evaluating reflex sympathetic dystrophy (RSD) responds to criticisms that a percentage impairment score may not adequately reflect the disability of an individual with RSD. The author highlights the importance of recognizing the difference between impairment and disability in the AMA Guides to the Evaluation of Permanent Impairment (AMA Guides): impairment is the loss, loss of use, or derangement of any body part, system, or function; disability is a decrease in or the loss or absence of the capacity to meet personal, social, or occupational demands or to meet statutory or regulatory requirements because of an impairment. The disparity between impairment and disability can be encountered in diverse clinical scenarios. For example, a person's ability to resume occupational activities following a major cardiac event depends on medical, social, and psychological factors, but nonmedical factors appear to present the greatest impediment and many persons do not resume work despite significant improvements in functional capacity. A key requirement according to the AMA Guides is objective documentation, and the author agrees that when physicians consider the disability evaluation of people, more issues than those relating to the percentage loss of function should be considered. More study of the relationships among impairment, disability, and quality of life in patients with RSD are required.

COMBINATORIAL POLYNOMIALLY COMPUTABLE CHARACTERISTICS OF SUBSTITUTIONS AND THEIR PROPERTIES

2020 ◽  
Vol 7 (2) ◽  
pp. 34-41
Author(s):  
VLADIMIR NIKONOV ◽  
◽  
ANTON ZOBOV ◽  
Keyword(s):  
Mathematical Expectation ◽  
Point Of View ◽  
Small Range ◽  
Computational Point ◽  
Wide Range ◽  
Bijective Function ◽  
The Difference ◽  
Element Base ◽  
Selection Of

The construction and selection of a suitable bijective function, that is, substitution, is now becoming an important applied task, particularly for building block encryption systems. Many articles have suggested using different approaches to determining the quality of substitution, but most of them are highly computationally complex. The solution of this problem will significantly expand the range of methods for constructing and analyzing scheme in information protection systems. The purpose of research is to find easily measurable characteristics of substitutions, allowing to evaluate their quality, and also measures of the proximity of a particular substitutions to a random one, or its distance from it. For this purpose, several characteristics were proposed in this work: difference and polynomial, and their mathematical expectation was found, as well as variance for the difference characteristic. This allows us to make a conclusion about its quality by comparing the result of calculating the characteristic for a particular substitution with the calculated mathematical expectation. From a computational point of view, the thesises of the article are of exceptional interest due to the simplicity of the algorithm for quantifying the quality of bijective function substitutions. By its nature, the operation of calculating the difference characteristic carries out a simple summation of integer terms in a fixed and small range. Such an operation, both in the modern and in the prospective element base, is embedded in the logic of a wide range of functional elements, especially when implementing computational actions in the optical range, or on other carriers related to the field of nanotechnology.

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