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Physics of zero-gap laser welding of...

Dasgupta, Ashish Kalyan.

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Physics of zero-gap laser welding of zinc-coated steel and application in automobile body manufacturing.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Physics of zero-gap laser welding of zinc-coated steel and application in automobile body manufacturing./
作者:	Dasgupta, Ashish Kalyan.
面頁冊數:	169 p.
附註:	Adviser: Jyotirmoy Mazumder.
Contained By:	Dissertation Abstracts International68-08B.
標題:	Engineering, Automotive. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3276912
ISBN:	9780549183952

Physics of zero-gap laser welding of zinc-coated steel and application in automobile body manufacturing.
Dasgupta, Ashish Kalyan.

Physics of zero-gap laser welding of zinc-coated steel and application in automobile body manufacturing. - 169 p.

Adviser: Jyotirmoy Mazumder.

Thesis (D.Eng.)--University of Michigan College of Engineering Graduate Professional Programs, 2007.

Finally, commercialization potential of the research is investigated for the global automotive industry.

ISBN: 9780549183952Subjects--Topical Terms:

1018477
Engineering, Automotive.

Physics of zero-gap laser welding of zinc-coated steel and application in automobile body manufacturing.
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020 $a 9780549183952
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040 $a UMI $c UMI
100 1 $a Dasgupta, Ashish Kalyan. $3 1265887
245 1 0 $a Physics of zero-gap laser welding of zinc-coated steel and application in automobile body manufacturing.
300 $a 169 p.
500 $a Adviser: Jyotirmoy Mazumder.
500 $a Source: Dissertation Abstracts International, Volume: 68-08, Section: B, page: 5514.
502 $a Thesis (D.Eng.)--University of Michigan College of Engineering Graduate Professional Programs, 2007.
520 $a Finally, commercialization potential of the research is investigated for the global automotive industry.
520 $a Zinc-coated steel (also known as galvanized steel) is a popular material in structural applications where strength, formability and corrosion resistance are desired. A universal example of such an application is the automobile body structure consisting of welded frames and shells. Every year, millions of such corrosion-resistant structural components are manufactured worldwide using galvanized steel.
520 $a During automobile body manufacturing, individual galvanized steel components are often fusion welded together in lap configuration, using various energy sources. A significant number these welded components also get scrapped or fail prematurely because of poor joint quality, believed to be caused by the vaporization of zinc during welding. In addition to a solution for this problem, there is a demand for accurate, in-process, weld quality guaranteeing sensors that would replace the destructive testing methods. In today's highly competitive global automotive industry, it is simply impossible for a forward moving automaker to overlook the impact of such factors on its net profit, product reliability and brand equity.
520 $a This research is centered on welding of galvanized steel using high power laser beams for automobile body manufacturing. Physics of galvanized steel laser welding is modeled using fundamentals of heat transfer, fluid flow, plasma theory and scientific computation. The model, whose results are found to be in close agreement with the experimental measurements, is capable of simulating unique laser welding conditions by adjusting parameters like laser power, welding speed, laser wavelength, plasma absorption, steel and zinc coating thicknesses etc.
520 $a 10.6 mum CO2 and 1.03 mum Yb:YAG laser beams are used for welding production grade galvanized steel using a novel, zero-gap, alloy-based method. The effectiveness of this method in controlling vaporization of zinc during laser welding is investigated. In addition, statistical design of experiments, based on the Taguchi method, is used to understand the effect of process parameters on the weld geometry, microstructure, mechanical properties etc. Multiple quality characteristics of each weld are combined into a single, dimensionless, total quality index (TQI), which is subsequently used in the Taguchi analysis to optimize the process parameters. A separate study on the corrosion behavior is also conducted.
520 $a Atomic emission spectroscopy is used to understand laser-material interaction and plasma behavior during the welding process. The spectroscopy signals are correlated with the weld TQI's to obtain the logic for in-process guaranteeing of weld quality. The results are being used for developing a prototype sensor for production floor use.
590 $a School code: 1375.
650 4 $a Engineering, Automotive. $3 1018477
650 4 $a Engineering, Mechanical. $3 783786
690 $a 0540
690 $a 0548
710 2 $a University of Michigan College of Engineering Graduate Professional Programs. $3 1256340
773 0 $t Dissertation Abstracts International $g 68-08B.
790 $a 1375
790 1 0 $a Mazumder, Jyotirmoy, $e advisor
791 $a D.Eng.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3276912