ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Considering the exhaust valve spindle consists of a valve head and a stem comprising thebody, the use of different materials, that is, Nimonic 80A for the head and SNCrW for the stem, canreduce the manufacturing cost dramatically. The inertia welding was conducted to make the largeexhaust valve for low speed marine diesel engines, superalloy Nimonic 80A for valve head of 540mmdiameter and high alloy SNCrW for valve stem of 115mm diameter. Due to different properties ofmaterial like thermal conductivity and flow stress on the two sides of the weld interface, modeling iscrucial in determining the optimal weld geometry and parameters. FE simulation was performed bythe commercial code DEFORM-2D. A Good agreement between the predicted and actual weldedshape was observed. It was expected that simulation will significantly reduce the number ofexperimental trials needed to determine the weld parameters, especially for welds of very expensivematerials or large shaft. A variety of tests, including microstructure observation, tensile, hardness andfatigue test, are conducted to evaluate the quality of welded joints
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.1429.pdf
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