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Process variable

About: Process variable is a research topic. Over the lifetime, 3983 publications have been published within this topic receiving 43130 citations. The topic is also known as: process parameter.


Papers
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Journal ArticleDOI
TL;DR: In this article, numerical simulation and finite element analysis were applied to optimize the important parameters including V-type joint and current frequency for high-frequency induction welding, and the shape of the slit between the different welding parameters and the centerline of the squeeze roll showed the relationship of the welding image and the welding quality and provided a solution for real-time online monitoring of welding quality.

13 citations

Patent
26 Jan 2007
TL;DR: In this article, a process transmitter includes a manually operated power generator to provide electrical power to sense a process variable, produce an output based on the sensed process variable and provide a display of the output.
Abstract: A process transmitter includes a manually operated power generator to provide electrical power to sense a process variable, produce an output based on the sensed process variable, and provide a display of the output.

13 citations

Patent
27 Oct 1986
TL;DR: In this paper, a method for manufacturing mineral fibers comprises controlling the bushing temperature to maintain molten glass throughput from a bushing at a constant, calculating the viscosity of the molten glass from the busshing temperature and the temperature of a glass delivery means, and modifying a process parameter in response to the calculated viscosities.
Abstract: A method for manufacturing mineral fibers comprises controlling the bushing temperature to maintain molten glass throughput from a bushing at a constant, calculating the viscosity of the molten glass from the bushing temperature and the temperature of a glass delivery means, and modifying a process parameter in response to the calculated viscosity.

13 citations

01 Apr 2003
TL;DR: In this article, the authors developed a basic understanding of the evolution of the microstructure to be able to relate it to the deformation process variables of strain, strain rate, and temperature.
Abstract: Friction stir welding is a solid-phase joining, or welding process that was invented in 1991 at The Welding Institute (TWI). The process is potentially capable of joining a wide variety of aluminum alloys that are traditionally difficult to fusion weld. The friction stir welding (FSW) process produces welds by moving a non-consumable rotating pin tool along a seam between work pieces that are firmly clamped to an anvil. At the start of the process, the rotating pin is plunged into the material to a pre-determined load. The required heat is produced by a combination of frictional and deformation heating. The shape of the tool shoulder and supporting anvil promotes a high hydrostatic pressure along the joint line as the tool shears and literally stirs the metal together. To produce a defect free weld, process variables (RPM, transverse speed, and downward force) and tool pin design must be chosen carefully. An accurate model of the material flow during the process is necessary to guide process variable selection. At MSFC a plastic slip line model of the process has been synthesized based on macroscopic images of the resulting weld material. Although this model appears to have captured the main features of the process, material specific interactions are not understood. The objective of the present research was to develop a basic understanding of the evolution of the microstructure to be able to relate it to the deformation process variables of strain, strain rate, and temperature.

13 citations

Journal ArticleDOI
Zhuo Huang1, Huajun Cao1, Dan Zeng1, Weiwei Ge1, Chengmao Duan1 
TL;DR: In this paper, a carbon efficiency evaluation approach is proposed to reveal the trade-off between carbon emissions and the added manufacturing value for decision-making on the premise of ensuring the welding quality.
Abstract: As a new generation of manufacturing technology, laser welding is widely applied in the fields of automobile, aerospace, etc. with its compelling advantages of high flexibility, quality, and energy density. However, the environmental performance of the laser welding process is not clear so far. There is a lack of systematic analysis of the laser welding process that takes all the energy sources and material consumption into consideration to reflect the actual environmental impact and evaluate the process parameter for decision-making. In this study, a parameterized model linking the carbon emissions and laser welding parameters is established. Based on this, a carbon efficiency evaluation approach is proposed to reveal the trade-off between carbon emissions and the added manufacturing value for decision-making on the premise of ensuring the welding quality. To verify the effectiveness of this approach, the carbon efficiency of the laser butt joint welding process is analyzed as an illustration. The results show that the parametric carbon emission models offer a feasible evaluation of carbon emissions of the laser welding process, with an accuracy of approximately 93.6%. The carbon emissions of the cooling system are 1.78 times that of laser devices. Thus, it dominates the carbon emissions of the laser welding process rather than laser devices. While ensuring the processing quality, increasing the welding speed is the most key way to improve carbon efficiency. The reason for it is that the carbon emissions of auxiliary facilities, e.g., cooling system can be reduced significantly as the reduced welding time. Furthermore, the standby time used, e.g., clamping and taking-off of workpieces, etc., is another key factor affecting the carbon efficiency. Thus, shortening the standby time can also improve the carbon efficiency of the laser welding process.

13 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202329
202266
2021289
2020318
2019281
2018274