scholarly journals Emphasis of Weld Time, Shielding Gas and Oxygen Content in Activated Fluxes on the Weldment Microstructure

2021 ◽  
Vol 1 (2) ◽  
pp. 86-95
Author(s):  
Surinder Tathgir ◽  
Dinesh W Rathod ◽  
Ajay Batish
Keyword(s):  
Grain Growth ◽  
Oxygen Content ◽  
Sem Analysis ◽  
Deep Penetration ◽  
Shielding Gas ◽  
Depth Of Penetration ◽  
Dendrite Arm Spacing ◽  
Weld Time ◽  
Activated Flux ◽  
The Impact

The activated-TIG (A-TIG) process is a recognised process for achieving higher depth-of- penetration (DoP) and it could be used for various stainless-steel grades welding. The oxygen content of oxide based activated fluxes provide the extra heat during decomposition of flux and result into deep penetration. This study reveals the effect of short weld time of 2 sec in stationary arc, shielding environment (Ar and Ar + 2.5 % H2) and an effect of oxygen element in activated flux (CrO3 and SiO2) on the microstructure and weld metal micro-hardness. Use of hydrogen mix shielding gas during A-TIG process has significant impact on the dilution rate, grain size and dendrite arm spacing. The fraction of oxygen in the flux and the presence of silicon in SiO2 flux play a significant role in achieving higher DoP. To evaluate the impact of different shielding environment on grain growth, the samples were investigated with weld pool morphology, depth of penetration, weld chemistry, optical microscopy and SEM analysis. The extra heat produced due to oxygen fraction in activated flux and H2 induced shielding have been quantified in the study. The ferrite and austenite grain growth as well as the dendrite arm spacing found to be increased due to presence of H2 in shielding gas.

scholarly journals Effect of Oxygen Content in He-O2 Shielding Gas on Weld Shape in Ultra-deep Penetration TIG Welding

2007 ◽  
Vol 25 (1) ◽  
pp. 196-202 ◽  
Author(s):  
Shanping LU ◽  
Hidetoshi FUJII ◽  
Kiyoshi NOGI ◽  
Toyoyuki SATO
Keyword(s):  
Oxygen Content ◽  
Tig Welding ◽  
Deep Penetration ◽  
Shielding Gas ◽  
Weld Shape ◽  
Effect Of Oxygen

The influence of Hanok experience on tourists’ attitude and behavioral intention: An interplay between experiences and a Value-Attitude-Behavior model

2021 ◽  
pp. 135676672110117
Author(s):  
Choong-Ki Lee ◽  
Yvette Reisinger ◽  
Muhammad Shakil Ahmad ◽  
Yae-Na Park ◽  
Choong-Won Kang
Keyword(s):  
Behavioral Intention ◽  
Sem Analysis ◽  
Experience Economy ◽  
A Value ◽  
Functional Value ◽  
Experienced Utility ◽  
Attitude Behavior ◽  
Tourism And Hospitality ◽  
The Impact ◽  
Value Functional

This study examines the impact of Hanok experience on tourists’ attitude and behavioral intention using the experience economy ( Pine and Gilmore, 1998 ) and the experienced utility theory ( Kahneman et al., 1997 ). Specifically, the study explores how tourists’ experiences are associated with a Value-Attitude-Behavior (VAB) model in the context of a heritage tourism attraction such as Jeonju Hanok Village in South Korea. A total of 323 responses were examined using SEM analysis. The results revealed that educational, entertainment, and escapism experiences significantly influenced functional value. Functional value had a significant relationship with attitude, which was positively related to behavioral intention. The results indicate the interplay of tourists’ experiences with the VAB model. The study provides theoretical and practical implications for tourism and hospitality academics and practitioners.

Effects of oxygen content on microstructure and impact toughness of high heat input flux-cored wire weld metals

2018 ◽  
Vol 115 (4) ◽  
pp. 410
Author(s):  
Fengyu Song ◽  
Yanmei Li ◽  
Ping Wang ◽  
Fuxian Zhu
Keyword(s):  
Grain Size ◽  
Impact Toughness ◽  
Weld Metal ◽  
Oxygen Content ◽  
Heat Input ◽  
High Heat ◽  
Cored Wire ◽  
Weld Metals ◽  
High Heat Input ◽  
The Impact

Three weld metals with different oxygen contents were developed. The influence of oxygen contents on the microstructure and impact toughness of weld metal was investigated through high heat input welding tests. The results showed that a large number of fine inclusions were formed and distributed randomly in the weld metal with oxygen content of 500 ppm under the heat input condition of 341 kJ/cm. Substantial cross interlocked acicular ferritic grains were induced to generate in the vicinity of the inclusions, primarily leading to the high impact toughness at low temperature for the weld metal. With the increase of oxygen content, the number of fine inclusions distributed in the weld metal increased and the grain size of intragranular acicular ferrites decreased, which enhanced the impact toughness of the weld metal. Nevertheless, a further increase of oxygen content would contribute to a great diminution of the austenitic grain size. Following that the fraction of grain boundary and the start temperature of transformation increased, which facilitated the abundant formation of pro-eutectoid ferrites and resulted in a deteriorative impact toughness of the weld metal.

IMPACT RESISTANCE PROPERTIES OF KEVLAR/GLASS FIBER HYBRID COMPOSITE LAMINATES

2015 ◽  
Vol 76 (3) ◽  
Author(s):  
Norazean Shaari ◽  
Aidah Jumahat ◽  
M. Khafiz M. Razif
Keyword(s):  
Glass Fiber ◽  
Hybrid Composite ◽  
Composite Laminates ◽  
Impact Damage ◽  
Impact Resistance ◽  
Impact Behavior ◽  
Slight Reduction ◽  
Depth Of Penetration ◽  
Damage Degree ◽  
The Impact

In this paper, the impact behavior of Kevlar/glass fiber hybrid composite laminates was investigated by performing the drop weight impact test (ASTM D7136). Composite laminates were fabricated using vacuum bagging process with an epoxy matrix reinforced with twill Kevlar woven fiber and plain glass woven fiber. Four different types of composite laminates with different ratios of Kevlar to glass fiber (0:100, 20:80, 50:50 and 100:0) were manufactured. The effect of Kevlar/glass fiber content on the impact damage behavior was studied at 43J nominal impact energy. Results indicated that hybridization of Kevlar fiber to glass fiber improved the load carrying capability, energy absorbed and damage degree of composite laminates with a slight reduction in deflection. These results were further supported through the damage pattern analysis, depth of penetration and X-ray evaluation tests. Based on literature work, studies that have been done to investigate the impact behaviour of woven Kevlar/glass fiber hybrid composite laminates are very limited. Therefore, this research concentrates on the effect of Kevlar on the impact resistance properties of woven glass fibre reinforced polymer composites.

Grain growth in perovskites: What is the impact of boundary transitions?

2016 ◽  
Vol 20 (5) ◽  
pp. 286-298 ◽  
Author(s):  
Wolfgang Rheinheimer ◽  
Michael J. Hoffmann
Keyword(s):  
Grain Growth ◽  
The Impact

THE IMPACT OF INFORMATION TECHNOLOGIES ON THE REGIONS’ ECONOMIC SECURITY

2017 ◽  
Author(s):  
Yuliya Tymchyshyn ◽  
Keyword(s):  
Information Technology ◽  
Information Technologies ◽  
Organizational Structures ◽  
Economic Security ◽  
Deep Penetration ◽  
Short Term ◽  
Economic Space ◽  
Business Entities ◽  
Short Term Forecasting ◽  
The Impact

The article highlights the impact of information technology on the economic security of regions and threats to economic security of the region that arise from the use of information technology. The system of economic security of the region in the context of development and application of information technologies is considered, which should include the following elements: diagnostics and identification of the existing state of economic security of the region; identification of threats to the economic security of the region from the use of information technology by business entities and from trends and problems in the development of the IT sector in the region; assessment of identified threats; development of effective mechanisms for their prevention; ensuring the increase of the level of economic security of the region with observance of the balance of national, regional and local interests; monitoring the level of economic security of the region. The main tasks of monitoring the economic security of the region in the context of development for the use of information technology are analyzed: monitoring the state of development of the IT sphere of the region and the level of ICT use in the activities of enterprises; timely detection of changes occurring in the IT sphere of the region and in the activities of economic entities of the region in the process of using information technology, and the reasons that caused them; prevention of negative trends leading to the formation and development of tensions in the IT sphere and socio-economic space of the region to prevent threats to its economic security; implementation of short-term forecasting of trends in the most important processes in the IT sphere of the region and in the functioning of economic entities from other sectors of the economy, due to the widespread use of IT in commercial, management and production activities; assessment of the effectiveness of methods, organizational structures and processes of managing the economic security of the region in terms of information development of society and the deep penetration of IT in various areas of management and economic activity at the regional level. The principles of monitoring the economic security of the region in the context of development and application of information technologies are revealed. The requirements to be met by the mechanism of economic security of the region, related to the intensification of informatization processes and the development of the IT sphere, are described. The functions that should be performed by the mechanism of economic security of the region (MESR) related to the intensification of informatization processes and the development of the IT sphere are substantiated. The main groups of computer crimes with the use of information computer technologies are identified, which have an extremely sharp impact on the economic condition of both a particular enterprise and the region as a whole.

Assessment of influencer’s effects on customers’ online purchasing behavior in Vietnam

2021 ◽  
Vol 11 (2) ◽  
pp. 81-96
Author(s):  
Pham Minh ◽  
Dang Thao Yen ◽  
Ngo Thi Huong Quynh ◽  
Hoang Thi Hong Yen ◽  
Tran Thi Thanh Nga ◽  
...  
Keyword(s):  
Technology Acceptance ◽  
Source Credibility ◽  
Sem Analysis ◽  
Ease Of Use ◽  
Influential Factor ◽  
Purchasing Behavior ◽  
Human Beings ◽  
Perceived Ease Of Use ◽  
Tam Model ◽  
The Impact

Today, the development of the Internet and social networks has changed the lives of human beings. The ability of these technologies to connect people in real-time expands the influence of some people in the community. Therefore, this study is conducted to test whether customers change purchasing behavior in online environments under the impact of those influencers by using Technology Acceptance Model (TAM). The study conducted a survey of 503 Vietnameses on Google Form from November 2020 to mid-January 2021. The collected data were analyzed using AMOS 24 with CB-SEM analysis method. The results showed a positive relationship between influencers and customers’ online purchasing behavior. More specifically, customers are more likely to buy online if they trust influencers and their advertisements. This is the most influential factor among the three influencer traits (as source credibility): trustworthiness, expertise, and attractiveness. A remarkable point in this study is that Vietnamese people are more concerned with perceived ease of use when buying online than other factors in the TAM model. This is the basis for businesses to implement influencer marketing strategies and improve the competitiveness of their online business.

scholarly journals Effect of Ti(C, N) Particle on the Impact Toughness of B-Microalloyed Steel

Metals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 868 ◽  
Author(s):  
Yu Huang ◽  
Guo-Guang Cheng ◽  
Shi-Jian Li ◽  
Wei-Xing Dai ◽  
You Xie
Keyword(s):  
Impact Toughness ◽  
Microalloyed Steel ◽  
Fracture Initiation ◽  
Sem Analysis ◽  
Number Density ◽  
Size Number ◽  
Microalloying Elements ◽  
The Impact ◽  
Ti Content ◽  
Scanning Electron

Simultaneously improving the toughness and strength of B-microalloyed steel by adding microalloying elements (Nb, V, Ti) has been an extensively usedmethod for researchers. However, coarse Ti(C, N) particle will precipitate during solidification with inappropriate Ti content addition, resulting in poor impact toughness. The effect of the size, number density, and location of Ti(C, N) particle on the impact toughness of B-microalloyed steel with various Ti/N ratios was investigated. Coarse Ti(C, N) particles were investigated to act as the cleavage fracture initiation sites, by using scanning electron microscopy (SEM) analysis. When more coarse Ti(C, N) inclusions were located in ferrite instead of pearlite, the impact toughness of steel with ferrite–pearlite microstructure was lower. Meanwhile, when the size or the number density of Ti(C, N) inclusions was larger, the impact toughness was adversely affected. Normalizing treatment helps to improve the impact property of B-microalloyed steel, owing to the location of Ti(C, N) particles being partly changed from ferrite to pearlite. The formation mechanism of coarse Ti(C, N) particles was calculated by the thermodynamic software Factsage 7.1 and Thermo-Calc. The Ti(C, N) particles formed during the solidification of molten steel, and the N-rich Ti(C, N) phase precipitated first and, then, followed by the C-rich Ti(C, N) phase. Decreasing the Ti and N content is an effective way to inhibit the formation of coarse Ti(C, N) inclusions.

scholarly journals Technical study of the effect of laser engraving using uArm swift pro robot

2021 ◽  
Vol 10 (3) ◽  
pp. 182
Author(s):  
Soumen Mondal ◽  
Ajoy Kumar Dutta
Keyword(s):  
Suitable Condition ◽  
Depth Of Penetration ◽  
Statistical Parameters ◽  
Laser Engraving ◽  
Spot Diameter ◽  
Penetration Effect ◽  
Working Length ◽  
Technical Study ◽  
Observation Method ◽  
The Impact

<p>Laser engraving is the most non - traditional and efficient working method in the machining of materials of different geometry as compared to conventional methods. The main objective of this study is to determine the impact of uArm swift pro robot operated laser engraving process on a wooden pitch board piece. However, the robot was connected with uArm Studio 1.1.22 software to perform laser engraving operation. For this purpose the effect of process parameters like spot diameter and depth of penetration were investigated with different working length of the robot end effector, measured from wooden pitch board base. Experimental observation method was used to investigate the formation of deep and light engraving pattern on the pitch board surface by measuring penetration depth and spot diameter in suitable condition. The result obtained from the experiment and statistical parameters showed a new dimension to find a suitable working length of the robot assisted laser nozzle where the laser penetration effect was clearly perceptible for the wooden material.</p>

scholarly journals Microstructural Characterization of Antimony Modified Carbidic Austempered Ductile Iron

2019 ◽  
Vol 8 (2) ◽  
pp. 36
Author(s):  
Abel. A. Barnabas ◽  
Akinlabi Oyetunji ◽  
S. O. Seidu
Keyword(s):  
Ductile Iron ◽  
Microstructural Characterization ◽  
Sem Analysis ◽  
Austempered Ductile Iron ◽  
Carbide Formation ◽  
Primary Carbide ◽  
Chunky Graphite ◽  
High Level ◽  
The Impact

In this research, Scanning Electron Microscope (SEM) analysis was conducted on the produced antimony modified carbidic austempered ductile iron for agricultural implement production. Six different alloys of carbidic austempered ductile iron with varying micro quantities of antimony elements were produced. The produced alloys were heated to austenitic temperature of 910oC, held at this temperature for 1 hour, finally subjected to austempering temperatures of 300&deg;C and 325&deg;C for periods of 1-3 hours. The SEM in conjunction with XRD and EDS was used for the analysis. Microstructural phase morphology, phase constituents and phase compositions were viewed with SEM, XRD and EDS respectively. The results show that various phases such as spiky graphite, blocky carbides, granular carbide, pearlite and ausferrite matrix. The XRD pattern revealed some compounds such as (Fe, Cr)3C, (primary carbide), Cr6C23 (few secondary carbide), (NiFe2O4), chromite (FeCr2O4), Cr7C3 (few eutectic carbide) and Cr3Ni2. In conclusion, it was observed in terms of morphology that chunky graphite, blocky carbide and pearlite phases were present in the cast carbidic ductile iron (CDI) without antimony addition. The CDI with varying quantities of antimony additions shows spiky graphite, granular carbides and pearlite matrix. After the samples were subjected to austempering processes, all the phases were found to be intact except the pearlite phase that transformed to ausferrite phase. The antimony element in the alloys was seen to promote the formation of pearlite phase intensively. The hardness of the samples increases as the antimony addition increases from 0.096wt.% to 0.288wt.% owing to the increase in pearlite phase, while the impact toughness reaches relatively high level, when 0.288wt.% antimony was added, probably due to the refinement of graphite nodules. All the results obtained showed that appropriate content of antimony addition plays an important role in increasing the nucleation rate of graphite nodules, and also lead to improvement in carbide formation thereby providing good balance between wear and impact properties.

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