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:
In this study the distribution and magnitude of residual stresses in a T-joint of aerospacegrade aluminium alloy weldment was determined using neutron diffraction. A 2 mm thick AA 6013sheet (as clip) was laser beam welded to a 6 mm thick AA 6056 base plate (as skin) to resemble the“short distance” welded clip-skin joints of an airframe. The total length of the weld was 120 mmand it was welded using 3.3 kW Nd:YAG laser source and 12% Si containing wire from one sideonly. No post weld heat treatment was applied after the welding. Start (run-in) and end (run-out)locations of the T-joints are generally considered as high risk areas with respect to solidificationcracking and crack initiations under external loadings. It is of interest to investigate the weldresidual stress fields at these locations to develop optimum joint design. Therefore, strainmeasurements have been performed not only in the middle of the weld seam but also at the run-inand run-out locations of these short distance welds. Higher longitudinal tensile residual stresses aredetected at the run-out locations than the run-in locations. The measurements in the clip showed thatthe clip has a longitudinal tensile stress peak away (about 8 mm) from the weld seam
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.524-525.419.pdf
