Shielding gas

About: Shielding gas is a research topic. Over the lifetime, 6697 publications have been published within this topic receiving 58668 citations.

Composite electrode for consumable electrode arc welding process

Abstract: A consumable composite electrode of infinite length for use in an automatic arc-welding of steel without shielding gas and the like shielding means comprising a steel sheath and a powdery mixture filled within the sheath and having a specific composition which contributes to the arc-welding of the steel workpiece

Laser and laser welding method

Abstract: Oxygen is included in auxiliary gases, and zinc-plated steel plates (3a, 3b) with no blow holes can be welded As the auxiliary gases, an oxygen gas bomb (4a) for O2 is provided in addition to an argon gas bomb (4b), argon gas and oxygen gas are mixed in a mixer (6), the mixture is delivered to a working head (7) and injected to a working point (9) via a nozzle (8) Oxygen oxidizes zinc of the zinc-plated steel plates (3a, 3b) to produce zinc oxide and zinc peroxide, which do not evaporate, the spatters are decreased in quantities and laser welding with a fewer blow holes can be performed

Numerical Investigations of the Influence of Design Parameters, Gas Composition and Electric Current in Plasma Arc Welding (PAW)

Abstract: Plasma Tungsten Arc Welding (PTAW) compared with TIG Welding enables an increased welding speed, a reduced energy input per unit length and butt joint welding of plates without preparation of the welded seam due to keyhole effect. However, because of missed profound understanding of effects in plasma arcs, the indisputable advantages of this process increase demands on education and especially on the experience of developers and operators. In this paper, process parameters, properties of the plasma jet and the molten pool are derived from the numerical modelling of arc and sheath layer under consideration of the process gas properties and the effects of demixing. Basics of the model and the testing site are introduced in this paper. Additionally, influences of current intensity, plasma gas quantity, process gases and their specific properties, torch geometry on plasma jet and energy input into work piece is shown by an exemplary torch. Model and numerical results have been validated by impact pressure measurements at the surface of the work piece and penetration profiles (cross section).

Shielding gas for laser welding

Abstract: Helium and helium base gas mixtures such as helium-hydrogen; helium-oxygen and helium-carbon dioxide have been found to improve weld penetration when used with presently available lasers to weld most steels.

Acquisition of welding skills in industrial robots

Abstract: Purpose – The purpose of this paper was to propose a method based on an Artificial Neural Network and a real-time vision algorithm, to learn welding skills in industrial robotics. Design/methodology/approach – By using an optic camera to measure the bead geometry (width and height), the authors propose a real-time computer vision algorithm to extract training patterns and to enable an industrial robot to acquire and learn autonomously the welding skill. To test the approach, an industrial KUKA robot and a welding gas metal arc welding machine were used in a manufacturing cell. Findings – Several data analyses are described, showing empirically that industrial robots can acquire the skill even if the specific welding parameters are unknown. Research limitations/implications – The approach considers only stringer beads. Weave bead and bead penetration are not considered. Practical implications – With the proposed approach, it is possible to learn specific welding parameters despite of the material, type of ...