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

Spinarc gas tungsten arc torch holder

Semiautomatic welding torch enables operator to control arc length, torch angle, and spring tension when welding small diameter aluminum tubing. Tungsten is preset for the weld to make arc initiation easier and to eliminate searching for the joint through a dark welding lens

Welding torch with arc light reflector

A welding torch arc light reflector is disclosed for welding torches having optical viewing systems. A schematic of a welding torch having an internal coaxial viewing system consisting of a lens which focuses the field of view of the weld scene of the workpiece onto the end of the fiberoptic bundle is provided. The transmitted image of the fiberoptic bundle is provided to a camera lens which focuses it onto a TV sensor array for transmission. To improve the parity of the image of the monitoring system, an arc light reflector is shown fitted to the end of the torch housing or gas cup. The arc light reflector has an internal conical section portion which is polished to serve as a mirror which reflects the bright arc light back onto the darker areas of the weld area and thereby provides a more detailed image for the monitoring system. The novelty of the invention lies in the use of an arc light reflector on welding torches having optical viewing systems

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)

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

Grain refinement control in TIG arc welding

A method for controlling grain size and weld puddle agitation in a tungsten electrode inert gas welding system to produce fine, even grain size and distribution is disclosed. In the method the frequency of dc welding voltage pulses supplied to the welding electrode is varied over a preselected frequency range and the arc gas voltage is monitored. At some frequency in the preselected range the arc gas voltage will pass through a maximum. By maintaining the operating frequency of the system at this value, maximum weld puddle agitation and fine grain structure are produced

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

Vacuum vapor deposition: A spinoff of space welding development

A vapor deposition process has been defined through a spinoff effort of space welding development. In this development for welding in a space environment, a hollow electrode was used to add gas precisely at the welding arc. This provides gas for ionization which carries the welding arc current. During this welding development metal vapor coatings were observed. These coatings are unique in that they are produced by a new process. Some coatings produced and the potential of this new and innovative vapor deposition process are characterized. Advantages over prior art are discussed

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

Closed circuit TV system automatically guides welding arc

Closed circuit television /CCTV/ system automatically guides a welding torch to position the welding arc accurately along weld seams. Digital counting and logic techniques incorporated in the control circuitry, ensure performance reliability