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PENGARUH VARIASI ARUS PENGELASAN SMAW TERHADAP SIFAT MEKANIK BAJA ST 37 UNTUK RANGKA MESIN PEMOTONG KAYU
Get PDFMOHAMAD FARIZ PRATAMA PUTRA (2024) “PENGARUH VARIASI ARUS PENGELASAN SMAW TERHADAP SIFAT MEKANIK BAJA ST 37 UNTUK RANGKA MESIN PEMOTONG KAYU”. Skripsi, prodi teknik mesin fakultas teknik dan ilmu komputer Universitas Pancasakti Tegal.
Pengelasan didefinisikan sebagai proses pembentukan ikatan metalurgi pada sambungan logam atau paduan logam dengan mencairkan bahan sampai kondisi meleleh atau cair. Metode pengelasan yang umum diterapkan dalam industri konstruksi adalah Shielded Metal Arc Welding (SMAW). Tujuan penelitian ini untuk mengetahui pengaruh variasi arus pada pengelasa terhadap nilai kekuatan tarik, bending dan impact pada baja ST 37.
Metode penelitian menggunakan alat: trafo las listrik, grinda potong, sikat baja, palu konde, palu terak. Bahan yang digunakan: baja karbon rendah ST 37, elektroda E-6013 diameter 2,6. Penelitian ini menggunakan metodologi eksperimen dengan memvariasikan variasi arus 70 A, 80 A, 90 A, pada pengelasan baja ST 37. Hasil pengelasan di uji dengan menggunakan pengujian tarik, bending, dan uji impak.
Pada hasil pengujian tarik kuat arus 70 amper mempunyai kuat tarik 456,1 Mpa sedangkan pada kuat arus 80 amper mempunyai kuat tarik 456,5 Mpa dan kuat arus 90 amper mempunyai kuat tarik 435,3 Mpa. Disimpulkan untuk kekuatan tarik tertinggi berturut-turut diberikan oleh jenis variasi arus 80 amper, 70 amper, 90 amper. Pada hasil pengujian bending ini untuk arus terbesar pada 80 amper dan arus terendah pada 70 amper pada masing masing arus untuk 80 amper mempunyai lengkungan sebesar 1098,94 Mpa di ikuti arus 90 amper mempunyai nilai sebesar 1040,30 Mpa, dan untuk arus terendah pada 70 amper mempunyai nilai 929,15 Mpa. Hasil dari pengujian impact ini untuk arus terbesar pada 90 amper dan arus terendah pada 80 amper. Pada masing-masing arus memiliki nilai untuk arus 90 amper mempunyai nilai 1,236 J/mm2 nilai terbesar selanjutnya 70 amper 1,179 J/mm2 dan arus terendah pada 80 amper mempunyai nilai 1,116 J/mm2. hasil pengujian tarik, bending, dan impact pada setiap sampel atau spesimen dengan variasi arus 70A, 80A, dan 90A dalam proses pengelasan SMAW menunjukkan bahwa kekuatan tertinggi pada pengujian tarik dan bending terdapat pada sampel dengan variasi arus 80A karena dapat memberikan pengaruh positif terhadap kekuatan tarik, bending, dan impact. Hal ini disebabkan oleh kesesuaian arus 80A dalam menciptakan penguatan antar sambungan yang optimal.
Kata kunci : Las SMAW, Baja ST 37, Uji tarik, uji bending, uji impack
MOHAMAD FARIZ PRATAMA PUTRA (2024) "THE EFFECT OF VARIATIONS IN SMAW WELDING CURRENT ON THE MECHANICAL PROPERTIES OF ST 37 STEEL FOR WOOD CUTTING MACHINE FRAME". Thesis, mechanical engineering study program, faculty of engineering and computer science, Pancasakti University, Tegal.
Welding is defined as the process of forming a metallurgical bond at a metal or metal alloy joint by melting the material until it melts or melts. The welding method commonly applied in the construction industry is Shielded Metal Arc Welding (SMAW). The aim of this research is to determine the effect of tensile, bending and Impak strength values on ST 37 steel.
The research method uses tools: electric welding transformer, cutting grinder, steel brush, bun hammer, slag hammer. Materials used: low carbon steel ST 37, electrode E-6013 diameter 2.6. This research uses an experimental methodology by varying current variations of 70 A, 80 A, 90 A. Welding results are tested using tensile, bending and Impak tests.
In the tensile test results, a current strength of 70 amperes has a tensile strength of 456.1 Mpa, while a current strength of 80 amperes has a tensile strength of 456.5 Mpa and a current strength of 90 amperes has a tensile strength of 435.3 Mpa. It was concluded that the highest tensile strength was given by the current variations of 80 amperes, 70 amperes, and 90 amperes respectively. In the results of this bending test, the highest current is at 80 amperes and the lowest current is at 70 amperes. Each current for 80 amperes has a bend of 1098.94 Mpa, followed by a current of 90 amperes which has a value of 1040.30 Mpa, and for the lowest current at 70 ampere has a value of 929.15 Mpa. The results of this Impak test are for the largest current at 90 amperes and the lowest current at 80 amperes. For each current, the value for a current of 90 amperes has a value of 1.236 J/mm2, the next largest value is 70 amperes, 1.179 J/mm2 and the lowest current at 80 amperes has a value of 1.116 J/mm2. The results of tensile, bending and Impak tests on each sample or specimen with current variations of 70A, 80A and 90A in the SMAW welding process show that the highest strength in tensile and bending tests is found in samples with current variations of 80A because it can have a positive influence on tensile strength. , bending, and Impak. This is due to the suitability of the 80A current in creating optimal reinforcement between connections.
Key words : SMAW welding, ST 37 steel, tensile test, bending test, Impak tes
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
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
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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