Volume 18, Issue 5 (2018)                   Modares Mechanical Engineering 2018, 18(5): 132-141 | Back to browse issues page

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Pakmanesh M R, Shamanian M, Asghari S. Analysis of the laser welding parameters of stainless steel foil by statistical response surface methodology for joining PEMFC bipolar plates. Modares Mechanical Engineering. 2018; 18 (5) :132-141
URL: http://mme.modares.ac.ir/article-15-15578-en.html
1- Institute of Materials and Energy, Iranian Space Research Center, Isfahan, Iran
2- Department of Materials Engineering, Isfahan University of Technology, Isfahan, Iran
Abstract:   (1181 Views)
In the present study, the effect of parameters of autogenous pulsed Nd: YAG laser welding process on the lap joint of a 316L stainless steel foil with a thickness of 100 µm to be used as bipolar plates of polymeric fuel cell was investigated. For this purpose, the statistical tools, the analysis of variance and the various diagrams were used to analyze the data by response surface methodology. The peak power (130 to 650 W), pulse durability (1.5 to 3.5 ms), and welding frequency (14 to 18 Hz) were considered as input parameters. The mentioned statistical method was able to predict the effect of welding parameters by developing second-order polynomials, so that the total error including the repeatability error and the lack of fit error for shear strength model, weld undercut model, and weld underfill model obtained 2, 8 and 3, respectively. The defects of weld undercut and lack of penetration were identified as most important factors affecting the shear strength. The laser power is as the main parameter in this process and the impact of it on the shear strength of the weld, the weld undercut and the weld underfill is calculated 64, 62 and 66%, respectively. Finally, the maximum shear strength with the value of 522 MPa is achieved at a peak power of 260 W, pulsed duration of 3 ms and welding frequency of 17 Hz. In this case, the weld undercut is determined as 3 micrometers.
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Article Type: Research Article | Subject: Aerospace Structures
Received: 2018/01/17 | Accepted: 2018/02/18 | Published: 2018/09/24

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