scholarly journals Use of Laser Metal Deposition for launcher parts

2021 ◽  
Author(s):  
Norberto Jimenez Mena ◽  
Philippe Dufour ◽  
Nicolas Nutal ◽  
Cedric Georges ◽  
Ana Brandão
Keyword(s):  
Mechanical Performance ◽  
Processing Parameters ◽  
Metal Deposition ◽  
Laser Metal Deposition ◽  
Original Design ◽  
Destructive Testing ◽  
Large Space ◽  
Component Size ◽  
Non Destructive

In this study, we focus on additive manufacturing using Laser Metal Deposition (LMD) to produce a large space aluminum component that is expensive to manufacture with conventional methods and requests a long lead time. Two main objectives are aimed at: the setup of the process with the determination of process parameters that lead to healthy parts and the demonstration that the component size and geometry is largely compatible with LMD. Two materials are considered for this component. AlSi10Mg and Scalmalloy®. Processing parameters have been optimized to obtain a density on both materials over 99.5%. The final material is chosen with regard to the mechanical performance. Scalmalloy provides both better strength and ductility and is chosen to print a demonstrator. The demonstrator printed in this study is a section of a large (1 m diameter) ring-shaped component that has been topologically optimized. Some modifications are made on the original design in order to make it compatible with LMD printing. The printing strategy is then established. The results of the (non-) destructive testing reveal that the demonstrator is healthy and the mechanical properties are as expected.

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.

Study of the residual imperfections using methods of probability theory

2021 ◽  
Vol 87 (9) ◽  
pp. 44-49
Author(s):  
D. A. Kuzmin
Keyword(s):  
Probability Theory ◽  
Generalized Equation ◽  
Structural Elements ◽  
Non Destructive Testing ◽  
Operational Control ◽  
Destructive Testing ◽  
Control Procedures ◽  
Non Destructive ◽  
A Current

Discontinuities in the products that occur during manufacture, mounting or upon operation can be missed during non-destructive testing which do not provide their complete detectability at a current level of the technology. Therefore, it is necessary to take into account that certain structural elements may have discontinuities of significant dimensions. We present the results of using the methods of probability theory in studying the residual imperfections that remains in the structure after non-destructive control and repair of the previously identified defects. We used the results of operational control of units carried out by ultrasonic and radiographic methods. We present a method for determining a multifactorial coefficient that takes into account the detectability of defects, the number of control procedures and the errors in the instrumentation and methodological support, as well as a generalized equation for the probability distribution of detecting discontinuities. The developed approach provides assessing of the level of damage to the studied objects, their classification proceeding from the quantitative data and determination of the values of postulated discontinuities for deterministic calculations. The results obtained can be used to improve the methods of monitoring NPP facilities.

Standardisation of X-Ray Powder Diffraction Methods

2004 ◽  
Vol 443-444 ◽  
pp. 31-34
Author(s):  
Giovanni Berti ◽  
Rob Delhez ◽  
S. Norval ◽  
B. Peplinski ◽  
E. Tolle ◽  
...  
Keyword(s):  
Technical Committee ◽  
Non Destructive Testing ◽  
X Ray Diffraction ◽  
Destructive Testing ◽  
X Ray ◽  
Standard Documents ◽  
And Control ◽  
Non Destructive ◽  
Research Centres

This paper outlines the standardisation process for the XRPD method that is currently being considered by a Working Group (WG10) of Technical Committee 138 "Non-destructive Testing" of the European Committee for Standardisation CEN. Several Standard Documents are on the verge of being released. These documents concern the general principles of (X-ray) diffraction, its terminology, and the basic procedures applied. Another document concerns the instruments used and it offers procedures to characterise and control the performance of an X-ray diffractometer properly. It is intended to issue Standard Documents on specific methods, e.g. determination of residual stresses. In fact work is in progress on this subject. The Standard Documents can be used by industry, government organisations, and research centres with activities related to safety, health and the environment, as well as for educational purposes.

scholarly journals Ultrasonic-Assisted Laser Metal Deposition of the Al 4047Alloy

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1111 ◽  
Author(s):  
Zhang ◽  
Guo ◽  
Chen ◽  
Kang ◽  
Cao ◽  
...  
Keyword(s):  
Relative Density ◽  
Laser Power ◽  
Tensile Ductility ◽  
Processing Parameters ◽  
Metal Deposition ◽  
Ultrasonic Power ◽  
Laser Metal Deposition ◽  
Ultrasonic Assisted ◽  
Cast Alloys ◽  
Cast Parts

Ultrasonic-assisted laser metal deposition(UALMD) technology was used to fabricate Al 4047 parts. The effect of the powder feeding laser power, remelting laser power and ultrasonic power on the relative density of the parts was investigated. The relative density, microstructure and mechanical properties of the specimens obtained by the optimized process parameters were compared with the corresponding properties of the cast alloys. The results showed that dense alloys with a maximum density of 99.1% were prepared using ultrasonic vibration and by remelting the previously deposited layer with the optimized processing parameters, and its density was almost equivalent to that of the cast parts. The microstructure of the samples using optimal laser parameters presented columnar Al dendrites and equiaxed Si particles at the boundary of each deposited layer, while the supersaturated Al solid solution was transformed into equiaxed crystal surrounded by fine fibrous Si phases at the center of the layer. Moreover, the size of the primary Al and the Si particles in the samples produced by UALMD was remarkably refined compared to that of the primary Al and Si particles in the cast structure, resulting in grain refining strengthening. The observed variation in the microstructure had an obvious impact on the tensile properties. The mechanical behavior of the deposit obtained by UALMD revealed superior tensile strength, yield strength and tensile ductility values of 227 ± 3 MPa, 107 ± 4 MPa and 12.2 ± 1.4%, which were approximately 51%, 38% and 56% higher than those of the cast materials, respectively.

Cyclic vs. Static Loading Behaviour of Masonry Blocks: An Approach to Evaluate the Long-Term Behaviour

2010 ◽  
Vol 452-453 ◽  
pp. 129-132
Author(s):  
Paola Antonaci ◽  
Pietro G. Bocca ◽  
Davide Masera
Keyword(s):  
Fatigue Behaviour ◽  
Non Destructive Testing ◽  
Static Displacement ◽  
Destructive Testing ◽  
Testing Laboratory ◽  
Cyclic Displacement ◽  
Non Destructive ◽  
Compressive Tests

The paper presents the results of an experimental investigation conducted on bricks. Prism-shaped specimens were produced. Laboratory tests were carried out at the Non-Destructive Testing Laboratory of the Politecnico di Torino. They were subjected to static compressive tests for the determination of their mechanical properties and cyclic compressive tests for the analysis of their fatigue behaviour. The aim of this work is to apply a failure criterion based on the observation of the static and cyclic curves to estimate the fatigue life and the long-term behaviour of the brick. Subsequently, it will be possible to give a relation between the static-displacement and cyclic-displacement of the material tested.

Non Destructive Testing of Unfired Pressure Vessels

2005 ◽  
Author(s):  
Guy Baylac ◽  
Ian Roberrts ◽  
Erik Zeelenberg
Keyword(s):  
Pressure Vessels ◽  
Non Destructive Testing ◽  
European Standard ◽  
Destructive Testing ◽  
Acceptance Criteria ◽  
Equipment Industry ◽  
Non Destructive

This paper discusses the non destructive testing (NDT) of unfired pressure vessels made of ductile and tough steels, as contained in Part 5 of the European standard EN 13445:2002. The concept and use of testing groups along with “satisfactory experience” in welding are presented. Also the background and rationale for the determination of standards used for NDT methods, characterisation and acceptance criteria are discussed in detail. Benefits for the pressure equipment industry are emphasised.

Non-Destructive Testing of Glued Laminated Timber Beams with Use of Pilodyn 6J – Method of Spike

2016 ◽  
Vol 825 ◽  
pp. 23-26
Author(s):  
Pavel Klapálek ◽  
Lenka Melzerová
Keyword(s):  
Modulus Of Elasticity ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Glued Laminated Timber ◽  
Measurement Results ◽  
Non Destructive ◽  
Timber Beams ◽  
The Way

This article is focused on GLULAM (glued laminated timber) beams and determination of their properties by using non-destructive method. This text is mainly focused just on part of more complex research of glued laminated timber beams. This text is focused on non-destructive method, which is the method of spike that uses device called Pilodyn 6J for measurement. Results of this method are in form of Young ́s modulus of elasticity. This article will describe how the method of spike works, with basic description, describes the tested material and compare the results of testing. In the conclusion we discuss the results, make conclusions and describe the way of our further research of glued laminated timber beams.

Research on Cladding Nickel on Copper Crystallizer Using Laser Metal Deposition Technique

2010 ◽  
Vol 97-101 ◽  
pp. 3846-3851 ◽  
Author(s):  
Guang Yang ◽  
Wei Jun Liu ◽  
Wei Wang ◽  
Fei Xing ◽  
Feng Jie Tian ◽  
...  
Keyword(s):  
Erosion Resistance ◽  
Energy Dispersive Spectrometer ◽  
Processing Parameters ◽  
Metal Deposition ◽  
Bonding Interface ◽  
Laser Metal Deposition ◽  
Optimal Processing ◽  
Large Numbers ◽  
Nickel Based Alloy ◽  
Cladding Layers

To increase the strength and erosion resistance of Copper Crystallizer, the system based on Laser Metal Deposition (LMD) process was proposed to clad nickel-based alloy on its surface. With the optimal processing parameters ascertained by large numbers of experiments, the crystallizer was clad nickel-based alloy. The morphology and the microstructures of the cladding layers and bonding interface were analyzed by energy dispersive spectrometer and scanning electronic microscopy. The result shows that the bonding interface realizes the metallurgic and tight bonding.

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