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Hardfacing of 3.5% Chromium Cast Steel by Flux Cored Wire Arc Welding Process
No full textHardfacing weld is a technique which mainly improves and extends the useful life of engineering components. The purpose of this research is to improve welding procedure for one layer and three layers hardfacing of 3.5% Chromium cast steel and to study wear behavior of hardfacing layers. Flux Cored Wire Arc Welding (FCAW) process has been used as a welding process of this research by choosing austenitic stainless steel and martensitic hardfacing wire to weld the buffer and hardfacing layer respectively. Preheating was also used in this study. Abrasive wear test of hardfacing deposit were conducted in accordance with procedure “A” standard of ASTM G65. In addition, microstructures and macrostructure of worn surface deposits were analyzed by using optical microscope. These results showed that there is no crack and defect in the Heat Affected Zone (HAZ) and other regions. The hardness of preheating sample in HAZ regions was lower than the ones without preheating. Therefore, preheating samples should be done before welding. The abrasive wear resistance of three layers hardfacing deposit was better than one layer hardfacing deposit because one layer hardfacing deposit was more diluted from buffer layer than three layers hardfacing deposit. Moreover, weight loss of one hardfacing layer was also higher than three layers.</jats:p
The comparison of weld metal with and without additional powder using submerged arc welding
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Effects of the austenitic buffer layer on abrasive mass losses of alloys hardfaced with a martensitic layer using submerged arc welding
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Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Microstructural and mechanical properties of welded SSM356-T6 and SSM7075-T6 aluminum semi-solid sheets by friction stir welding
No full textFriction Stir Welding (FSW) was the welding process applied in this research to join different grades of aluminum alloy sheets Semi-Solid Metal (SSM) 356-T6 and 7075-T6. The test pieces have dimensions of 50 mm × 100 mm × 4 mm. The effect of tool rotational speed on metallurgy, and mechanical properties of welding was investigated. Dissimilar butt joints were produced by using cylindrical pin with conditions of different tool rotation speed (710, 1,000 and 1,400 rpm) and welding speed (80, 112 and 160 mm/min). The welding microstructures showed three different areas including base metal, stir zone and thermo mechanical affected zone, which were directly affected by the rotation speed of tool. The butt joint rotation speeds 1,000 rpm provided the average maximum tensile strength 246.33 MPa. Rotational speed allowed material flow from the from to the rear of the tool. The heat generated from friction lead to microstructural change and promote good mix and adhesion of both materials
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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