Effect of relative position in low-power pulsed-laser–tungsten-inert-gas hybrid welding on laser-arc interaction

The effects of arc modes on laser-arc hybrid welding for AA6082-T6 aluminum alloy were comparatively studied. Two arc modes were employed: pulsed metal inert gas arc and cold metal transfer arc. The results indicated that joints without porosity, undercutting, or other defects were obtained with both laser-pulsed metal inert gas hybrid welding (LPMHW) and laser-cold metal transfer hybrid welding (LCHW). Spatter was reduced, and even disappeared, during the LCHW process. The sizes of equiaxed dendrites and the width of the partially melted zone in the LPMHW joint were larger than those in the LCHW joint. The microhardness in each zone of the LPMHW joint was lower than that of the LCHW joint. The softening region in the heat-affected zone of the LPMHW joint was wider than that of the LCHW joint. The tensile strength of the LCHW joint was higher than that of the LPMHW joint. For the two joints, the fractures all occurred in the softening region in the heat-affected zone, and the fracture morphologies showed ductile fracture features. The dimples in the fractograph of the LCHW joint were deeper than those of the LPMHW joint.

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Electroluminescence of silicon nanocrystallites prepared by pulsed laser ablation in reduced pressure inert gas

Journal of Applied Physics ◽

10.1063/1.367373 ◽

1998 ◽

Vol 83 (10) ◽

pp. 5427-5432 ◽

Cited By ~ 67

Author(s):

Takehito Yoshida ◽

Yuka Yamada ◽

Takaaki Orii

Keyword(s):

Laser Ablation ◽

Pulsed Laser ◽

Pulsed Laser Ablation ◽

Inert Gas ◽

Reduced Pressure ◽

Silicon Nanocrystallites

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Pulsed LASER-(Micro)TIG Welding of Automotive Dissimilar Zn-Coated Advanced High Strength Steels Thin Sheets in Overlap Configuration

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1138.147 ◽

2016 ◽

Vol 1138 ◽

pp. 147-152

Author(s):

Aurel Valentin Bîrdeanu

Keyword(s):

High Performance ◽

Pulsed Laser ◽

Welding Process ◽

High Strength Steels ◽

High Strength ◽

Industrial Applications ◽

Cost Ratio ◽

Hybrid Welding ◽

Thin Sheets ◽

Advanced High Strength Steels

The development and implementation into a high number of industrial applications of materials categorized as (Advanced) High Strength Steels (AHSS) due to their high performance per cost ratio is more and more present and this trend is also combined with the development and implementation of new joining technologies and processes, including laser-arc hybrid processes.The paper presents the results of applying Pulsed LASER-(micro)TIG hybrid welding process, for realizing overlap joints for Zn-coated (A)HSS materials in dissimilar configurations, joints that were presented as designed based on UltraLight Steel Auto Body (ULSAB) principles.The influence of main hybrid welding process parameters was investigated in order to establish if one can obtain joints with high values for the shear strength resistance for some of the actually used dissimilar steel combinations based on designs applied throughout ULSAB project and the autos built following these principles.

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