The effect on deflection of steel diaphragm of pressure sensor due to change in boundary condition in the welded region
Manufacturing a high-pressure sensitive diaphragm type sensor is a complex task. Due to it’s complex shape, several parts are designed individually. It involves welding of several parts. As welding involves several parameters it’s difficult to control the welding geometry where it is being fused. So it is likely that the physical boundary condition of the welded region will be different from the theoretical boundary conditions. So the change in boundary condition will make the deflection of the diaphragm different. For a precision device, any effect of a change in boundary condition can affect the deflection of the diaphragm largely. Thus, any effect of imperfect welding in a high precision measuring device can hamper the sensitivity of the particular device. A welded diaphragm of steel for a pressure sensor using eddy current sensor to detect it’s deflection due to pressure can lose it’s effectivity, due to the unpredictable boundary conditions created after the welding. In this paper, we will be trying to find the cause of deviation between the theoretical and experimental results due to the effect of a change in boundary conditions at the welded region.
KeywordsDiaphragm Deflection Eddy current sensor Manufacturing Pressure sensor Welding
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- R. Grace, Application opportunities of MEMES/MST in the automotive market, Proc. Vehicle Display Microsens’ 99, MI, Sept., 22-23 (1999) 25–31.Google Scholar
- J. Powell, Engine control using cylinder pressure: Past, present and future, ASME J. Dyn. Sys. Meas., Control, 115 (2B) 343-350.Google Scholar
- B. Heywood, Internal Combustion Engine fundamentals, McGraw Hill, New York, USA (1998).Google Scholar
- T. J. Midgely and T. A. Boyd, Methods of measuring detonation in ingines, SAE Trans, 17 (1922).Google Scholar
- R. R. David, Engine combustion: pressure measurement and analysis, SAE (2010).Google Scholar
- V. B. Andre, A. V. Jose and F. M. Luiz, Applied measurement systems: Chap. 2 Internal combustion engine indicating measurements, Intech (2012).Google Scholar
- P. J. Modenesi, E. R. Apolinário and I. M. Pereira, TIG welding with single-component fluxes, J. Mater. Process. Technol., 99 (2000) 260–265.Google Scholar
- C. Yang, S. Lin, F. Lui, L. Wu and Q. Zhang, Research on the mechanism of penetration increase by flux in A-TIG welding, J. Mater. Sci. Techno., 19 (1) (2005) 225–227.Google Scholar