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

scholarly journals Development of laser welding of high strength aluminium alloy 2024-T4 with controlled thermal cycle

2020 ◽  
Vol 326 ◽  
pp. 08005
Author(s):  
Mete Demirorer ◽  
Wojciech Suder ◽  
Supriyo Ganguly ◽  
Simon Hogg ◽  
Hassam Naeem
Keyword(s):  
Laser Beam ◽  
Laser Welding ◽  
Heat Input ◽  
Thermal Cycle ◽  
Laser Beam Welding ◽  
Base Material ◽  
High Strength ◽  
Cooling Rates ◽  
Aa 2024 ◽  
Welding Processes

An innovative process design, to avoid thermal degradation during autogenous fusion welding of high strength AA 2024-T4 alloy, based on laser beam welding, is being developed. A series of instrumented laser welds in 2 mm thick AA 2024-T4 alloys were made with different processing conditions resulting in different thermal profiles and cooling rates. The welds were examined under SEM, TEM and LOM, and subjected to micro-hardness examination. This allowed us to understand the influence of cooling rate, peak temperature, and thermal cycle on the growth of precipitates, and related degradation in the weld and heat affected area, evident as softening. Although laser beam welding allows significant reduction of heat input, and higher cooling rates, as compared to other high heat input welding processes, this was found insufficient to completely supress coarsening of precipitate in HAZ. To understand the required range of thermal cycles, additional dilatometry tests were carried out using the same base material to understand the time-temperature relationship of precipitate formation. The results were used to design a novel laser welding process with enhanced cooling, such as with copper backing bar and cryogenic cooling.

scholarly journals Laser beam welding of copper foil stacks using a green high power disk laser

Procedia CIRP ◽  
2020 ◽  
Vol 94 ◽  
pp. 582-586
Author(s):  
Sophie Grabmann ◽  
Lazar Tomcic ◽  
Michael F. Zaeh
Keyword(s):  
Laser Beam ◽  
High Power ◽  
Copper Foil ◽  
Laser Beam Welding ◽  
Disk Laser

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).

Heat source model for laser beam welding of steel-aluminum lap joints

2017 ◽  
Vol 93 (1-4) ◽  
pp. 709-716 ◽  
Author(s):  
Anton Evdokimov ◽  
Katrin Springer ◽  
Nikolay Doynov ◽  
Ralf Ossenbrink ◽  
Vesselin Michailov
Keyword(s):  
Heat Source ◽  
Laser Beam ◽  
Laser Beam Welding ◽  
Source Model ◽  
Lap Joints ◽  
Heat Source Model
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