Topic
Shielding gas
About: Shielding gas is a research topic. Over the lifetime, 6697 publications have been published within this topic receiving 58668 citations.
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TL;DR: In this paper, the effects of activating flux on AZ31B alloy welding were investigated and it was found that applying activating flux to the Alloy surface led to an increase in weld penetration depth.
Abstract: The effects of an activating flux on AZ31B alloy welding were investigated. Alternating current tungsten inert gas (ACTIG) welding was used to weld 5·0 mm thick AZ31B alloy plates with CdCl2, AlF3 and TiO2 activating flux. Applying the activating flux on the AZ31B alloy surface led to an increase in weld penetration depth. Various welding conditions, such as welding current, welding arc length, welding shielding gas flowrate, welding speed and flux thickness, influenced to different extents the ability of the activating flux to increase weld penetration. Furthermore, a high speed camera was used to monitor the arc images during welding. It was found that the brightest region of the arc was broader when CdCl2 and AlF3 were used, while the stability of the arc was increased when TiO2 was used, especially in the positive electrode period. In summary, it is important that a uniform flux layer is present at the alloy plate surface and suitable welding parameters are selected.
21 citations
TL;DR: In this paper, an autogenous laser full penetration welding between dissimilar cast Ni-based superalloy K418 and alloy steel 42CrMo flat plates with 3.5 mm thickness was conducted using a 3 kW continuous wave Nd:YAG laser.
21 citations
Dissertation•
14 Sep 2011
TL;DR: In this article, a 2D model including the cathode, arc plasma and anode domains is developed to study in-depth stationary GTAW. The study of moving GTAW with filler metal is performed using a hybrid 2D-3D approach.
Abstract: It is well reported in the literature that the characteristics of the weld joint and the heat transfer at the solid/liquid interface are highly dependent on the fluid flow in the weld pool. In the present work, we numerically investigate the effects of welding parameters on GTA weld pools developments. A 2D model including the cathode, arc plasma and anode domains is developed to study in-depth stationary GTAW. This also permits to quantify the effects of the chemical composition of the shielding gas, and to study new welding techniques such as GTAW with alternate supply of shielding gases. The study of moving GTAW with filler metal is performed using a hybrid 2D-3D approach. The numerical simulations conducted for horizontal-position welding reveal a huge asymmetry of the weld towards the opposite gravity direction, which is numerically found to be the effect of buoyancy-induced flows and asymmetrical free surface deformation. This defect can be significantly reduced in dissimilar sulfur content welds by placing the low sulfur plate at the bottom.
21 citations