scholarly journals Experimental studies on the possibility of using a pulsed laser for spot welding of thin metallic foils

2020 ◽  
Vol 10 (1) ◽  
pp. 674-680
Author(s):  
Piotr Sęk
Keyword(s):  
Experimental Studies ◽  
Pulsed Laser ◽  
Welding Process ◽  
Pulse Mode ◽  
Weld Strength ◽  
Spot Welds ◽  
Butt Welding ◽  
Strength Tests ◽  
Metallic Foils ◽  
The Impact

AbstractThe purpose of the experiment was to study the influence of the laser beam in pulse mode on metallic foils in order to obtain a spot weld. The welding process was carried out using the overlap weld method, using spot welds in various quantities. The Nd - YAG BLS 720 pulsed laser was used to conduct the experiment. The impact of the number of spot welds on the value of force needed to break the sample was examined. A number of measurements were carried out to determine the best process parameters. Butt welding and overlap welding were also performed using a continuous weld consisting of spot welds. Weld strength tests were performed to select the most appropriate parameters for the process under consideration.

Pavement Concrete Construction Process on the Spatial Variability of the Pavement Structural Strength

2012 ◽  
Vol 204-208 ◽  
pp. 1843-1847
Author(s):  
Da Wei Wang ◽  
Hua Liang Chen
Keyword(s):  
Spatial Variability ◽  
Structural Design ◽  
Structural Strength ◽  
Experimental Studies ◽  
Construction Technology ◽  
Construction Process ◽  
Distribution Law ◽  
Strength Tests ◽  
The Impact ◽  
Pavement Concrete

Obtained through the large number of field core samples from a variety of strength tests, the impact of the construction technology of concrete pavement structural strength spatial variability of the distribution law of the strength of concrete in the pavement structure, to find out the variability characteristics of the structural strength, to determine the structural design of reliability coefficient to provide a basis. On the basis of theoretical studies and experimental studies, practical techniques for pavement concrete structure and properties of the variability of design control and construction control, to control the variability of pavement concrete structural strength.

scholarly journals Fuzzy C-Means Partition Cluster Analysis and Validation Studies on a Subset of CiteScore Dataset

2019 ◽  
Vol 8 (9S3) ◽  
pp. 105-107
Keyword(s):  
Cluster Analysis ◽  
Laser Welding ◽  
Validation Studies ◽  
Welded Joint ◽  
Experimental Studies ◽  
Pulsed Laser ◽  
Welding Process ◽  
Pulsed Laser Welding ◽  
Fuzzy C Means

The article deals with promising areas of application of pulsed laser welding for products made of silver-based alloys. The results of experimental studies to improve the quality of the welded joint and the efficiency of the welding process with the use of activated absorption additives are presented

Experimental and numerical investigation of the characteristics of flash-butt joints used in continuously welded rails

2019 ◽  
Vol 234 (1) ◽  
pp. 65-79 ◽  
Author(s):  
Mohsen Ghazanfari ◽  
Parisa Hosseini Tehrani
Keyword(s):  
Heat Affected Zone ◽  
Experimental Studies ◽  
Welding Process ◽  
Material Model ◽  
Maximum Temperature ◽  
Hardness Profile ◽  
Railway Network ◽  
Butt Welding ◽  
Influence Of Temperature On

Continuously welded rails are widely used in the Iran railway network, which are generally built using the flash-butt welding process. To accurately model the flash-butt welding process, thermal analysis, and prediction of the welding residual stresses, the influence of upsetting force on the total electrical resistance and a material model with consideration of the influence of temperature on the material properties are included in the numerical modeling. In this paper, numerical and experimental studies, including the finite element method, thermography, metallography, and hardness testing are performed to determine the characteristics of the welded UIC60 rail. By studying the fractured flash-butt welded UIC60 rails, it is shown that the location of the crack initiation and the rail failure in the web and heat affected zone of the welded rails was similar as compared to the maximum tensile residual stress calculated by numerical simulation. According to the numerical and experimental results, it is shown that four key parameters – such as the maximum temperature during the welding process, the total welding time, the upsetting time, and the upsetting force – control the size, microstructure, and the hardness profile of the heat affected zone which directly affects the characteristics and quality of welding.

scholarly journals Improving the Quality of Welded Joints in Laser Welding of Silver Products

2019 ◽  
Vol 8 (9S3) ◽  
pp. 102-104
Keyword(s):  
Laser Welding ◽  
Welded Joints ◽  
Experimental Studies ◽  
Pulsed Laser ◽  
Welding Process ◽  
Pulsed Laser Welding

The article deals with promising areas of application of pulsed laser welding for products made of silver-based alloys. The results of experimental studies on the choice of modes of pumping, defocusing to improve the quality of the weld and the efficiency of the welding process.

An Investigation about Welding Parameters of Polypropylene Matrix Composite

2015 ◽  
Vol 729 ◽  
pp. 67-72
Author(s):  
Umit Huner ◽  
E. Selcuk Erdogan
Keyword(s):  
Matrix Composite ◽  
Welding Process ◽  
Break Point ◽  
Heating Time ◽  
Inorganic Materials ◽  
Weld Strength ◽  
Welding Parameters ◽  
Butt Welding ◽  
Base Strength ◽  
Polypropylene Matrix

This paper presents an experimental investigation of heated tool welding of polypropylene matrix composite. The goals of this paper are to investigate the issues of local changes of welding strength that depends on heating time. For experimental procedure, specimens were injection molded as ISO tensile test specimens and matrix was reinforced by organic and inorganic materials. In addition, welding of specimens was carried out by non-contact heated tool butt welding process. Within the range of the weld process parameters were investigated, the highest weld strength dependent on heating time was achieved of the order of 94% to the base strength of the material. And then these specimen’s maximum welding strengths and energy at break point properties that were depend on heating time have been compared.

Study on Control Technology of Pneumatic Servo Spot Welding Gun

2014 ◽  
Vol 529 ◽  
pp. 564-568 ◽  
Author(s):  
Zhong Sheng Sun ◽  
Jin Dai
Keyword(s):  
Spot Welding ◽  
Experimental Studies ◽  
Welding Process ◽  
Control Device ◽  
Control Technology ◽  
Proportional Valve ◽  
Electrode Force ◽  
The Impact ◽  
The Mathematical Model ◽  
Flow Valve

Control technology of pneumatic servo spot welding gun is studied, using the proportional flow valve as the control device. The mathematical model of the proportional valve-controlled cylinder system is established, and the experimental studies of position and force control for pneumatic servo spot welding gun have been done. The experimental results show that the servo gun opens smoothly and fast, the impact of electrode is greatly reduced, and the electrode force is controlled precisely and kept steadily, the quick changing of the electrode force is achieved in the welding process.

scholarly journals Correlation between Strength, Hardness and the Share of Welding Imperfections in an AW 5754 Aluminium Alloy Weld Executed with the TIG Method

2019 ◽  
Vol 49 (4) ◽  
pp. 383-400
Author(s):  
Piotr Woźny ◽  
Józef Błachnio ◽  
Krzysztof Dragan
Keyword(s):  
Aluminium Alloy ◽  
Process Parameters ◽  
Welded Joint ◽  
Welding Process ◽  
Weld Strength ◽  
Significant Relationships ◽  
Pearson Coefficient ◽  
Strong Relation ◽  
The Impact ◽  
Alloy Weld

Abstract The article presents the impact of welding imperfections on the strength and microhardness of AW 5754 aluminium alloy welded joints executed with the TIG method. It presents the results of tomographic tests of welds. The results of strength and microhardness tests involving welds executed under various welding process parameters were shown. The impact of welding imperfections on the strength and microhardness of a welded joint was analysed. Based on analysing the relations between the r Pearson coefficient values and multiple correlation, significant relationships between strength, hardness and weld defects were evidenced. Furthermore, a very strong relation between the welding process parameters, welding imperfections, and weld strength and microhardness was shown.

scholarly journals New possibilities for weld assessment using inverse wavefield extrapolation

2013 ◽  
Vol 4 (1) ◽  
Author(s):  
Casper Wassink ◽  
K. Chougrani ◽  
J. Van der Ent
Keyword(s):  
New Technologies ◽  
New Technology ◽  
Information Source ◽  
Welding Process ◽  
Quantitative Information ◽  
Three Dimensions ◽  
Weld Strength ◽  
Quality Of Data ◽  
Destructive Testing ◽  
The Impact

New technological capabilities in both girth weld Non Destructive Testing (NDT) and girth weld material characterization open the door for new ways of weld assessment. The paper gives examples of new technologies currently being developed in NDT and investigates how these technologies could add value, in the field, on weld testing and assessment. The guiding principle in this investigation is that the data gathered in NDT should be sufficient for making an engineering decision. It will be argued that this is not currently the case as NDT is now used in a qualitative check on the welding process rather than a quantitative information source on the weld strength.An overview of technologies like Inverse Wave Extrapolation (IWEX), Full Matrix Capture (FMC), and Sampling Phased Array (SPA) will be given. These technologies show promise to increase the quality of data received from Automated Ultrasonic Testing (AUT) of pipeline girth weld. The most important improvement is that an image of the defect is generated, in three dimensions, which allows for improved assessment of the impact of detected flaws on the weld strength. The paper will then show how these new capabilities could be combined with new technology in material testing and finite element calculations, which has specific value for strain based pipeline designs. The result is a vision on the future of girth weld assessment.

scholarly journals Managing the influence of microstructure defects on the strength of EN AW 5754 aluminium alloy welded joints executed with the TIG method

2018 ◽  
Vol 182 ◽  
pp. 02025
Author(s):  
Piotr Woźny ◽  
Józef Błachnio
Keyword(s):  
Aluminium Alloy ◽  
Process Parameters ◽  
Welded Joints ◽  
Welding Process ◽  
Inert Gases ◽  
Weld Strength ◽  
Tungsten Electrode ◽  
Welding Defects ◽  
Strong Relation ◽  
The Impact

The paper concerns the issue of the impact of welding defects on the strength of EN AW 5754 aluminium alloy welded joints, executed with the TIG welding method (tungsten inert gas, i.e., a method of welding with a non-consumable tungsten electrode shielded with inert gases). The article presents examples of operating damage to welded joints and discusses the factors impacting the weld quality. The strength test results of welding samples taken under different process parameters were presented. The impact of welding defects and non-conformities identified with a CAT test on the weld joint impact was analysed. The studies showed a strong relation between the presence of welding defects, welding process parameters and weld strength.

scholarly journals Modeling of the Weld Strength in Spot Weld Using Regression Analysis of the Stress Parameters based on the Simulation Study

2016 ◽  
Vol 6 (1) ◽  
pp. 51 ◽  
Author(s):  
Sachin Arun Patil ◽  
Farzad Baratzadeh ◽  
Hamid Lankarani
Keyword(s):  
Regression Analysis ◽  
Welded Joints ◽  
Spot Welding ◽  
Welding Process ◽  
Spot Weld ◽  
Weld Strength ◽  
Complete Analysis ◽  
Test Speed ◽  
Type Test ◽  
The Impact

To enhance the performance of spot weld joints, various improvement methods are used to strengthen the properties of welded joints. Spot welding process is very well suited for welding of various steels grades. Regression analysis is the statistical modeling technique, and it is suitable for predicting strength of welded joints. It is valuable for quantifying the impact of various loading types upon a spot weld rupture.In the present study quantification of impact strength of spot welded EHSS steel, Mild Steel (DC05) and AHSS (DP780) were carried out, by developing the regression models. The analysis includes Material, Thickness, Test type, Test Speed as process parameters. The complete analysis will be helpful in deciding the best combinations for desired performance characteristics. Taguchi technique revealed that the impact speed is the most significant factor in weld strength followed by thickness and material grade.

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