Topic
Gas metal arc welding
About: Gas metal arc welding is a research topic. Over the lifetime, 11706 publications have been published within this topic receiving 109555 citations. The topic is also known as: metal active gas welding & GMAW.
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TL;DR: In this paper, a 45 mm high strength steel was welded using the fiber laser-MAG hybrid process utilizing a metal-cored wire without pre-heating, and it was found that the technique can be used successfully to weld thick sections with appropriate quality when the parameters are optimized.
49 citations
TL;DR: In this paper, the effect of different surface conditions of steel (viz, galvanized, galvanealed and uncoated) and gap between the sheets on braze joint formation have been investigated.
49 citations
Journal Article•
TL;DR: In this article, the authors present an experimental investigation that attempts to establish correlations between sound signature, welding parameters and weld transfer mode with a view toward detection of weld defects, and the results indicate that the sound signature is a usable, practical information source for process linked quality control of welds.
Abstract: On-line quality control in automated welding operations is an important factor contributing to higher productivity, lower costs and greater reliability of the welded components. However, the development of on-line inspection techniques and feedback control is still in its infancy. Sound signature produced by GMAW contains information about the behavior of the arc column, the molten metal and the metal transfer mode. Manual welders rely on sound signature as important feedback for production of good welds. High-speed data acquisition and computer-aided analysis of the sound signature may indicate conditions that generate weld defects. This paper presents an experimental investigation that attempts to establish correlations between sound signature, welding parameters and weld transfer mode with a view toward detection of weld defects. The results indicate that the sound signature is a usable, practical information source for process-linked quality control of welds.
49 citations
TL;DR: In this article, the results of a collaborative research project on laser beam weldability of carbon steels of high sheet thickness are presented, which includes single and multiple pass welding of 16 mm and 20 mm thick plates, as well as the investigation of acceptable tolerances i.e. gap bridgeability and edge misalignment.
Abstract: The results of a collaborative research project on laser beam weldability of carbon steels of high sheet thickness are presented. That includes single and multiple pass welding of 16 mm and 20 mm thick plates, as well as the investigation of acceptable tolerances i.e. gap bridgeability and edge misalignment. For the welding experiments fibre lasers with 8 kW, 20 kW laser power and different GMAW-techniques were used in various applications. With the 20 kW fibre laser 16 mm plates could be welded with a single pass, 20 mm required a seam preparation or alternatively preheating of the material. For multi pass welding with 8 kW laser power a joint preparation with a single V-butt joint with a broad root face (Y-groove) was applied. The root pass was always welded with a hybrid process, the filler passes with a hybrid process as well as a GMAW process which produced the best results.
49 citations
TL;DR: In this paper, the effect of secondary austenite (γ2) on corrosion resistance of welded joints was investigated using optical microscopy and scanning electron microscopy, and the results were correlated with double loop electrochemical potentiodynamic reactivation (DL-EPR) and sulphide stress corrosion tests.
49 citations