Original scientific paper The joints made by fusion of materials are exposed to the influence of residual stresses induced by welding thermal cycles. Residual stresses were measured on butt welded plates made of NIOMOL 490K, before and after reparation. The objective of this paper is to compare three methods of residual stress measurement (hole-drilling method, x-ray diffraction and directional...

• Chipping, sledging and hammering on metal, stone or concrete • Use of manual, pneumatic and power impact tools • Caulking, brushing and grinding • Drilling, scaling and scraping soldering and casting hot metals • Handling acids, caustics and creosoted materials • Gas welding, cutting and brazing • Drilling overhead • In environments of excessive dust • Electric arc welding and cutting, and ot...

An investigation on bridging larger welding gaps between workpieces occurring in practice due to structural requirements or to defects in weld edge preparation is described. Some characteristic cases from practice where a larger root gap should be bridged or the space between two or three workpieces should be filled with a greater quantity of filler material are described. Submerged-arc welding...

Urinary fluoride concentrations have been measured in electric arc welders using basic electrodes. The fluoride concentration and the total welding fume concentration in air showed a linear relation with postshift urinary fluoride concentration. The measured concentrations were below internationally recommended postshift urinary fluoride concentrations believed to cause fluorosis. Biological mo...

This paper is focused on the study and the control of a deposition process of robotic arc welding. The process consists of a SMD (Shaped Metal Deposition) system, that is a novel rapid prototyping tungsten inert gas (TIG) welding technique leading to near-net-shape, using a layer by layer deposition technique. An experimental setup has been properly implemented in order to study the system and ...

BACKGROUND The aim of the study was to present the results of welders' occupational exposure to "blue light" and UV radiation carried out at industrial workstations during TIG and MMA welding. MATERIALS AND METHODS Measurements were performed at 13 workstations (TIG welding: 6; MMA welding: 7), at which different welding parameters and materials were used. The radiation level was measured usi...

TIG welding is an arc-welding process that produces coalescence of metals by heating them with an arc between a non-consumable tungsten electrode and the base metal 1 . Many delicate components in aircraft and nuclear reactors are TIG welded due to its reliability. Basically, TIG weld quality is strongly characterized by the weld pool geometry as shown in Figure 1. This is because the weld pool...

1 ATE-80212044©Asian-Transactions September 2012 Study the Effect of Welding Joint Location on the Fatigue Strength and Fatigue Life for Steel Weldment Dr.Ali Sadiq Yasir Kufa University / Faculty of Engineering Mechanical Engineering Department IRAQ E-mail:[email protected] / [email protected] Abstract: The welding process is one of the oldest joining processes between the ma...

Abstract The gas tungsten arc welding process is an uncertain nonlinear multivariable system. In order to control the welding process, the nonlinear dynamic relationship between the weld pool geometry reflecting the weld quality and the welding parameters must be developed. A three-dimensional numerical model is developed to investigate the dynamic characteristics of the weld pool geometry when...

D. Dobrota, Engineering Faculty, University “Constantin Brâncuşi” of Târgu-Jiu, Romania, Gh. Amza, Engineering and Tehnological Systems Management Faculty, Polytehnic University of Bucharest, Romania, Research presented in the paper refers to the structural analysis of materials that are thermally infl uenced for loading by welding of pieces in the classical variant of manual coated electric ar...