Welding high-strength aluminum alloys

Handbook has been published which integrates results of 19 research programs involving welding of high-strength aluminum alloys. Book introduces metallurgy and properties of aluminum alloys by discussing commercial alloys and heat treatments. Several current welding processes are reviewed such as gas tungsten-arc welding and gas metal-arc welding

THE EFFECT OF LEARNING DEMONSTRATION METHOD ON THE LEARNING ACHIEVEMENT IN SMAW PRACTICE AT SMK N SUKAMAJU

The research purposes are : (1) to know the learning achievement of students in grade XI SMK N Sukamaju on manual arc welding subject of horizontal fillet positions which are taught with the demonstration method, (2) to know the learning achievement of students in grade XI SMK N Sukamaju on manual arc welding subject of horizontal fillet positions which are taught with the lecture method, (3) to know the difference in learning achievement of students in grade XI SMK N Sukamaju manual arc welding subject of horizontal fillet connections which are taught by demonstration method with taught by lecture method The research is one of pretest-posttest Control Group DesignS which compare an experiment group and the control group. This research i population of the study was a XI class student of Welding Engineering Department SMK N Sukamaju with 28 students. The data were analyzed with descriptive statistical techniques. The research product shows: (1) the learning achievement of students in grade XI SMK N Sukamaju on manual arc welding subject of horizontal fillet positions which are taught with the demonstration method (experiment group) obtained the highest score of 87, lowest score of 83, and the mean amounted to 84,21; (2) the learning achievement of students in grade XI SMK N Sukamaju on manual arc welding subject of horizontal fillet positions which were taught with the lecture method (control group) obtained the highest score of 81, lowest score of 77, and the mean amounted to 78,5 ; (3) there were differences in learning achievement of students in grade XI SMK N Sukamaju manual arc welding subject of horizontal fillet connections which were taught by demonstration method with taught by lecture method. The differences shown by mean value of experiment group (84,21) was higher than the mean value of control group (78,5)

PENGEMBANGAN MODUL MENGELAS DENGAN PROSES SHIELDED METAL ARC WELDING (SMAW) DI SMK N 2 WONOSARI

Tujuan dari penelitian ini adalah mengembangkan suatu produk baru yang berupa modul mengelas dengan proses Shielded Metal Arc Welding (SMAW) di SMK N 2 Wonosari. Tujuan lain dari penelitian ini adalah mengetahui tahapan pengembangan dan kelayakan dari modul mengelas dengan proses Shielded Metal Arc Welding (SMAW) di SMK N 2 Wonosari sesuai dengan Kurikulum Tingkat Satuan Pendidikan (KTSP) di SMK N 2 Wonosari. Metode penelitian yang digunakan adalah metode penelitian dan pengembangan (Research and Development). Pengembangan produk baru berupa modul mata pelajaran kompetensi jurusan teknik las melalui beberapa tahap, yaitu (1) analisa kebutuhan yang terdiri dari (a) observasi lapangan, (b) analisa kebutuhan media; (2) evaluasi, (3) tahap kedua perancangan yang terdiri atas, (a) menyusun draf awal, (4) evaluasi, (5) tahap ketiga penelitian dan implementasi yang terdiri atas, (a) validasi perangkat, (b) analisa dan revisi, (c) uji coba perorangan, (d) evaluasi, (e) uji coba kelompok, (f) evaluasi, (g) uji lapangan, (6) analisa dan evaluasi, (7) modul. Penelitian ini dilakukan pada Siswa kelas X Jurusan Teknik Las SMK N 2 Wonosari. Data dikumpulkan dengan menggunakan instrumen berupa angket. Teknik analisis yang digunakan adalah analisis kualitatif dan kuantitatif untuk mengetahui kelayakan modul mengelas dengan proses Shielded Metal Arc Welding (SMAW) di SMK N 2 Wonosari. Dari uji kelayakan terhadap modul mengelas dengan proses Shielded Metal Arc Welding (SMAW) yang dikembangkan, menurut penilaian dosen ahli materi memperoleh kriteria sangat layak, penilaian Guru Program Studi Teknik Las sebagai ahli materi memperoleh kriteria penilaian sangat layak, penilaian dari ahli media memperoleh kriteria penilaian sangat layak. Dari uji coba perorangan mendapatkan kriteria sangat layak. Dari uji coba kelompok kecil mendapatkan kriteria penilaian sangat layak. dari uji coba lapangan memperoleh kriteria penilaian sangat layak. Berdasarkan data tersebut dapat disimpulkan bahwa modul mengelas dengan proses Shielded Metal Arc Welding (SMAW) yang dikembangkan sudah baik sehingga layak digunakan untuk mendukung pembelajaran mengelas dengan proses Shielded metal Arc Welding (SMAW) di SMK N 2 Wonosari

Gas tungsten arc welding in a microgravity environment: Work done on GAS payload G-169

GAS payload G-169 is discussed. G-169 contains a computer-controlled Gas Tungsten Arc Welder. The equipment design, problem analysis, and problem solutions are presented. Analysis of data gathered from other microgravity arc welding and terrestrial Gas Tungsten Arc Welding (GTAW) experiments are discussed in relation to the predicted results for the GTAW to be performed in microgravity with payload G-169

Comparison between friction stir and submerged arc welding applied to joining DH36 and E36 shipbuilding steel

With the impending development of FSW tools for steel with useful lifetimes, attention has turned to the mechanical properties of the welds that can be made in a range of industrially significant steels. This work reports on a comparative study undertaken to examine the use of friction stir and submerged arc welding on DH36 and E36 shipbuilding steels. The study made an assessment of the distortion induced in fabricating plates by the two welding techniques, and provides initial comparative data on weld tensile strength, toughness and fatigue life. In each case, friction stir welding was shown to outperform submerged arc welding

Study of gas-tungsten-arc welding power density Final report, 1 Jun. 1968 - 30 May 1969

Power density in gas tungsten arc welding with modified cathode

Advances in Plasma Arc Welding: A Review

The nature of welding in the aeronautical industry is characterized by low unit production, high unit cost, extreme reliability and severe service conditions. These characteristics point towards more expensive and more concentrated heat sources such as plasma arc, laser beam and electron beam welding as the processes of choice for welding of critical components. Among various precision welding processes, Plasma Arc welding has gained importance in small and medium scale industries manufacturing bellows , diaphragms etc because of less expensive and easy to operate. This paper reviews the works on Plasma Arc welding and associated phenomena such as Micro Plasma Arc Welding, Variable Polarity Plasma Arc welding and Keyhole Plasma Arc Welding. The review covers works carried out by various researchers on various metals using different modes of plasma arc

The efficacy of teaching oxyacetylene welding prior to gas metal arc welding for introductory materials and process courses in industrial technology

Industrial technology programs around the country must be sensitive to the demands of manufacturing and industry as programs continue to replace vocational curriculum with high-tech alternatives. Entry-level managers who understand the practical as well as the theoretical nature of technology are still required. Much of the facility and vocational equipment infrastructures at institutions remain intact, albeit a bit dusty, and should be utilized to revitalize or reorganize a hot metals curriculum to meet the demands of industry. This research examines a curriculum that bolsters manual gas metal arc welding skills within the current time constraints of lab/lecture curriculums by allotting more hands-on gas metal arc welding time to students without sacrificing or impeding other subject matter. Simply put, which approach to teaching welding yields most effectively and efficiently the skill sets required by industrial technology students?;The study compared three different instructional methods for teaching arc welding: (1) oxyfuel welding with filler, (2) oxyfuel welding without filler, and (3) gas metal arc welding. All three groups tested on gas metal arc welding to determine which, if any, instructional method yielded the skill sets required for gas metal arc welding by industrial technology students. The results to the study indicated insufficient evidence to suggest any significant difference between the three groups at the 0.05 alpha level with the limited practice time allotted to each group. The study concluded that technology programs, in particular those with welding, must have students and industry in mind---this means that gas metal arc welding is a critical component of the industrial technology curriculum. Under the conditions of this study, teaching oxyfuel welding prior to gas metal arc welding does not impact gas metal arc welding skills and removing oxyfuel welding may be an option for programs that struggle to find time for both technologies. Furthermore, gas metal arc welding was found to be used more extensively in industry and may therefore be considered a more valuable skill than oxyfuel welding for industrial technology students

Effect of Process Parameter in SAW- A Review

In research organizations and industries, most widely used welding methods are shield metal arc welding (SMAW), gas metal arc welding (GMAW), gas tungsten arc welding (GTAW) and submerged arc welding (SAW). The SAW process is often preferred because it offers high production rate, high melting efficiency, ease of automation and low operator skill requirement. This study expose the different works have been done in the past for improving different properties of welded material. This study also exhibits the effect of different welding process parameters that affect the weld chemistry. Depending upon the requirement the details of past work will we easily obtained for future work with the help of this study

Variable polarity arc welding

Technological advances generate within themselves dissatisfactions that lead to further advances in a process. A series of advances in welding technology which culminated in the Variable Polarity Plasma Arc (VPPA) Welding Process and an advance instituted to overcome the latest dissatisfactions with the process: automated VPPA welding are described briefly