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:
The residual stress in steel welding can highly influences the performance of the jointduring its working life. Both boundary conditions and metal phase transformations have influenceon the levels of the residual stress in the weld.In this paper the residual stress for AISI 4047 bead-on-plate samples were measured by strain gagemethod after laser welding with different values for the laser speed and power, and focus height.The laser used for this project was the ROFIN DC 015 Industrial CO2 Slab Laser. This laser,registered as class 4 laser product in accordance with the European Norm EN 60825 is an highfrequency excited, diffusion cooled C02 gas laser, designed to be used for processing materials in aindustrial environment.The measurement procedure was performed on all the welded specimens taking notes of 3 strains(ε1 ε2 ε3) relative to as many gages at different depths, following the American Society for TestingMaterials (ASTM) standard.Thereafter the residual stresses were calculated by means of a non-linear finite element analysis.The analysis took in account the thermo-mechanical phenomena with temperature dependent steelproperties. The other considered also the phase transformation and phase-dependent thermal andmechanical properties
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.344.715.pdf
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