Microstructural and mechanical characterization of laser-beam welding of a 8090 Al-Li thin sheet

1996 ◽  
Vol 31 (6) ◽  
pp. 1455-1468 ◽  
Author(s):  
M. F. Lee ◽  
J. C. Huang ◽  
N. J. Ho
Keyword(s):  
Laser Beam ◽  
Mechanical Characterization ◽  
Thin Sheet ◽  
Laser Beam Welding

LBW of Similar and Dissimilar Skin-Stringer Joints Part I: Process Optimization and Mechanical Characterization

2008 ◽  
Vol 38 ◽  
pp. 306-319 ◽  
Author(s):  
A. Prisco ◽  
F. Acerra ◽  
Antonio Squillace ◽  
G. Giorleo ◽  
C. Pirozzi ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Structural Analysis ◽  
Aluminum Alloys ◽  
Laser Beam ◽  
Process Optimization ◽  
Mechanical Characterization ◽  
Laser Beam Welding ◽  
Filler Wire ◽  
Parent Materials

Laser beam welding of light alloys has always represented a big challenge for both designers and technologists due to the large number of process parameters to take into account and the variable responses of the different materials to be welded. In this paper the results of experimental research on laser beam welds of innovative heat treatable aluminum alloys is reported. The well known T geometry (a stringer welded to a skin) has been considered. Two different skins have been analyzed: AA 2139 and AA 6156, both in form of rolled sheets. Two different stringer have been analyzed: AA 2139 and PA 765, both in form of extruded parts. AA 4047 has been used as filler wire. In the first part of the paper, all the steps leading to the realization of sound welds will be described. The criteria used in order to assess the soundness of a weld was the absence of defects, such as cracks or large pores, verified by means of NDE. In the second part of study, both micro structural analysis and mechanical characterization of welds will be described and discussed. Conclusions will demonstrate the importance of the influence of chemical composition of the parts, above all stringer. The performance of the best welds, however, were very close to those of parent materials.

Mechanical and Microstructural Characterization of 8 mm Thick Samples of SS 316L by CO2 Laser Welding

2012 ◽  
Vol 585 ◽  
pp. 430-434 ◽  
Author(s):  
B. Ramesh Kumar ◽  
N. Chauhan ◽  
P.M. Raole
Keyword(s):  
Laser Beam ◽  
Laser Welding ◽  
Tensile Properties ◽  
Base Metal ◽  
Weld Zone ◽  
Laser Beam Welding ◽  
Microstructural Characterization ◽  
Mechanical Tests ◽  
Destructive Testing

Laser beam welding offers various advantages over the other conventional weld processes. In fusion reactor, some critical components with high weld quality are proposed to be fabricated with Laser beam welding. The present paper reports the mechanical properties and micro structural characterization of 8 mm thick SS 316L samples fabricated with high power CO2 Laser welding system. The process parameters of 3.5 kW and speed of 600 mm/min with Argon shielding gas are used. The Laser welded samples are subjected to non destructive testing with X-ray radiography and ultrasonic tests. The welded samples tested have indicated good quality joints with full penetration and no significant porosity and cracks. Further, the samples are subjected to standard mechanical tests namely tensile properties test (UTS), bend test and Impact Fracture test. The Laser weld joints produced better tensile properties as compared to the base metal. In addition, Vickers hardness tests and optical microstructure are studied for the base metal (BM), Heat Affected Zone (HAZ) and weld zone(WZ).

Mechanical characterization of CO2 laser beam butt welds of AA5083

2007 ◽  
Vol 191 (1-3) ◽  
pp. 381-384 ◽  
Author(s):  
A. Ancona ◽  
P.M. Lugarà ◽  
D. Sorgente ◽  
L. Tricarico
Keyword(s):  
Laser Beam ◽  
Co2 Laser ◽  
Mechanical Characterization ◽  
Butt Welds

Characterization of lap joints laser beam welding of thin AA 2024 sheets with Yb:YAG disk-laser

2012 ◽  
Author(s):  
Fabrizia Caiazzo ◽  
Vittorio Alfieri ◽  
Francesco Cardaropoli ◽  
Vincenzo Sergi
Keyword(s):  
Laser Beam ◽  
Laser Beam Welding ◽  
Lap Joints ◽  
Disk Laser ◽  
Aa 2024

Experiments and efficient simulations of distortions of laser beam–welded thin-sheet close beam steel structures

2018 ◽  
Vol 233 (3) ◽  
pp. 787-796 ◽  
Author(s):  
Oscar Andersson ◽  
Karl Fahlström ◽  
Arne Melander
Keyword(s):  
Laser Beam ◽  
Elevated Temperatures ◽  
Thin Sheet ◽  
Weld Zone ◽  
Laser Beam Welding ◽  
Welding Process ◽  
Steel Structures ◽  
Simulation Method ◽  
Beam Structures ◽  
Shrinkage Method

In this article, geometrical distortions of steel structures due to laser beam welding were analyzed. Two 700-mm-long U-beam structures were welded in overlap configurations: a double U-beam structure and a U-beam/flat structure. The structures were in different material combinations from mild steel to ultrahigh-strength steel welded with different process parameters. Different measures of distortions of the U-beam structures were evaluated after cooling. Significant factors of the welding process and the geometry of the structures were identified. Furthermore, welding distortions were modeled using two predictive finite element simulation models. The previously known shrinkage method and a newly developed time-efficient simulation method were evaluated. The new model describes the effects of expansion and shrinkage of the weld zone during welding and material plasticity at elevated temperatures. The new simulation method has reasonable computation times for industrial applications and improved agreement with experiments compared to the often used so-called shrinkage method.

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