ISSN:
1662-9752
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:
Friction welding processes, such as friction stir welding (FSW) and inertia frictionwelding (IFW) are popular candidate procedures for joining engineering materials (includingdissimilar pairs) for advanced applications. The advantages of friction welding include lack of largescale material melting, ability to join dissimilar materials, and relatively low propensity to introducedefects into the weld joint. For these reasons FSW and IFW have become the subjects of a numberof studies aimed at optimising the joining operations to obtain improved joint strength and reducedistortion and residual stress. In the present study we used the diffraction of high energypolychromatic synchrotron X-rays to measure interplanar lattice spacings and deduce nominalelastic strains in friction stir welds between dissimilar aluminium alloys AA5083 and AA6082, andin coupons from inertia friction welds between dissimilar nickel-base superalloys IN718 andRR1000. Energy-dispersive diffraction profiles were collected by two detectors mounted in thehorizontal and vertical diffraction planes, providing information about lattice strains in two nearlyperpendicular directions lying almost in the plane of the plate samples mounted perpendicularly tothe incident beam. Two-dimensional maps of residual stresses in friction-welded joints wereconstructed. Apart from the 2D mapping technique, the sin2ψ method (transmission) was also usedin the case of inertia friction-welded joint between nickel alloys. Comparison between the tworesults allowed the variation of the lattice parameter with the distance from the bond line to bededuced. It was found that friction welding of two dissimilar materials with significant strengthmismatch may lead to the creation of a region of compressive stress in the vicinity of the bond line,in contrast with the behaviour observed for joints between similar materials
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.571-572.407.pdf
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