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.
Papers published on a yearly basis
Papers
More filters
••
TL;DR: In this paper, the history of the use of hydrogen as a combustible or shielding gas in welding is discussed, and the advantages of using hydrogen in gas processes are discussed and compared.
38 citations
••
TL;DR: In this paper, a modified flux mixture was developed to improve the butt joint performance, and the weld appearance became better and the spreadability of filler metal was also greatly improved during brazing-fusion welding process.
38 citations
••
TL;DR: This study shows the results of systematically adjusted CTWD during WAAM of low-alloyed steel, showing an energy reduction of up to 40% could be implemented leading to an adaptation of geometrical and microstructural features of additively manufactured work pieces.
Abstract: Wire arc additive manufacturing (WAAM) by gas metal arc welding (GMAW) is a suitable option for the production of large volume metal parts. The main challenge is the high and periodic heat input of the arc on the generated layers, which directly affects geometrical features of the layers such as height and width as well as metallurgical properties such as grain size, solidification or material hardness. Therefore, processing with reduced energy input is necessary. This can be implemented with short arc welding regimes and respectively energy reduced welding processes. A highly efficient strategy for further energy reduction is the adjustment of contact tube to work piece distance (CTWD) during the welding process. Based on the current controlled GMAW process an increase of CTWD leads to a reduction of the welding current due to increased resistivity in the extended electrode and constant voltage of the power source. This study shows the results of systematically adjusted CTWD during WAAM of low-alloyed steel. Thereby, an energy reduction of up to 40% could be implemented leading to an adaptation of geometrical and microstructural features of additively manufactured work pieces.
38 citations
••
TL;DR: In this paper, the influence of the type of the gas and welding speed on the stability of the joining process and the melted metal transfer through the electric arc was analyzed, mainly underscoring the gases influences on the convexity of the bead.
38 citations
••
TL;DR: In this article, the correlation among three key geometric parameters, i.e., penetration, bead width and overthickness, and four technological variables that define the welding process are quantified.
37 citations