scholarly journals Investigations on dual laser beam welding of aluminum high pressure die castings at reduced ambient pressure

2018 ◽  
Vol 30 (3) ◽  
pp. 032420 ◽  
Author(s):  
Fabian Teichmann ◽  
Sebastian Müller ◽  
Klaus Dilger
Keyword(s):  
High Pressure ◽  
Laser Beam ◽  
Ambient Pressure ◽  
Laser Beam Welding ◽  
Die Castings ◽  
Dual Laser

Effects of reduced ambient pressure on spattering during the laser beam welding of mild steel

2019 ◽  
Vol 31 (4) ◽  
pp. 042016 ◽  
Author(s):  
Volker Rominger ◽  
Peter Berger ◽  
Helmut Hügel
Keyword(s):  
Laser Beam ◽  
Mild Steel ◽  
Ambient Pressure ◽  
Laser Beam Welding

Laser Beam Welding With Simultaneous Gaussian Laser Preheating

1993 ◽  
Vol 115 (1) ◽  
pp. 34-41 ◽  
Author(s):  
Y.-N. Liu ◽  
E. Kannatey-Asibu
Keyword(s):  
Heat Source ◽  
Laser Beam ◽  
Cooling Rate ◽  
Laser Beam Welding ◽  
Welding Process ◽  
Input Power ◽  
Relative Power ◽  
Gaussian Source ◽  
Distribution Parameters ◽  
Dual Laser

An analytical solution of the dual, laser beam welding process is presented. It is based on a Gaussian distributed leading heat source for preheating, followed by a line source for the actual welding process. The effect of beam distribution parameters as well as interbeam spacing and relative power intensities on the resulting temperature distribution and cooling rate are presented. For a preheating Gaussian source of power 1550 W, the depth of region above 500°C is 2.25 mm, and that above 250°C is 3.5 mm. The cooling rate at the weld centerline without preheating for a temperature of 650° C, input power 1800 W, and welding velocity 20 mm/s is found to be 1004°C/s. Under the same conditions, the cooling rate with a 1550 W preheating Gaussian distributed heat source (beam distribution parameter 1 mm, and interbeam spacing 10 mm) is reduced to 570°C/s.

Effect of Dual-Laser Beam Welding on Microstructure Properties of Thin-Walled γ-TiAl Based Alloy Ti-45Al-5Nb-0.2C-0.2B (TNB)

2012 ◽  
pp. 887-894 ◽  
Author(s):  
Jie Liu ◽  
Volker Ventzke ◽  
Peter Staron ◽  
Heinz-Guenter Brokmeier ◽  
Michael Oehring ◽  
...  
Keyword(s):  
Laser Beam ◽  
Laser Beam Welding ◽  
Thin Walled ◽  
Dual Laser

scholarly journals Effects of Reduced Ambient Pressure and Beam Oscillation on Gap Bridging Ability during Solid-State Laser Beam Welding

2020 ◽  
Vol 4 (2) ◽  
pp. 40
Author(s):  
Markus Köhler ◽  
Tamás Tóth ◽  
Andreas Kreybohm ◽  
Jonas Hensel ◽  
Klaus Dilger
Keyword(s):  
Solid State ◽  
Laser Beam ◽  
Ambient Pressure ◽  
Laser Beam Welding ◽  
Solid State Laser ◽  
Basic Process ◽  
Solid State Lasers ◽  
Gap Bridging ◽  
Welding Processes ◽  
Beam Oscillation

In recent decades, beam welding processes have been set up as a key technology for joining applications in automotive engineering and particularly in gearbox manufacturing. Due to their high beam quality, energy efficiency, reliability as well as flexible beam guidance, modern solid-state lasers offer numerous advantages, but also pose increased requirements on the production and positional accuracy of the components for the joining process. In particular, small-focus diameters present a challenge for components with process-induced tolerances, i.e., disc carriers in automatic transitions. Furthermore, welding processes utilizing solid-state lasers show an increased spatter formation during welding at high welding speeds. Accordingly, the primary objective of the presented work consists in extending the current areas of application for solid-state laser beam welding in gearbox manufacturing through an improved process reliability regarding tolerance compensation and spatter formation. Therefore, this experimental study aimed to describe the effects of a dynamic beam oscillation in combination with a reduced ambient pressure in the process environment on both gap bridging ability and spatter formation during the laser beam welding of case hardening steel. For basic process evaluations, laser beam welding at reduced ambient pressure and laser beam welding with dynamic beam oscillation were initially studied separately. Following a basic process evaluation, samples for 2 mm full-penetration-welds with varying gap sizes were analyzed in terms of weld seam geometry and weld spatter formation.

scholarly journals Process Optimization of Dual-Laser Beam Welding of Advanced Al-Li Alloys Through Hot Cracking Susceptibility Modeling

2016 ◽  
Vol 47 (7) ◽  
pp. 3533-3544 ◽  
Author(s):  
Yingtao Tian ◽  
Joseph D. Robson ◽  
Stefan Riekehr ◽  
Nikolai Kashaev ◽  
Li Wang ◽  
...  
Keyword(s):  
Laser Beam ◽  
Process Optimization ◽  
Laser Beam Welding ◽  
Hot Cracking ◽  
Susceptibility Modeling ◽  
Dual Laser
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