Fusion zone behavior in micron-size laser welding

2002 ◽  
Author(s):  
G. A. Knorovsky ◽  
V. V. Semak ◽  
D. O. MacCallum
Keyword(s):  
Laser Welding ◽  
Fusion Zone ◽  
Micron Size

scholarly journals Effect of Micro Solidification Crack on Mechanical Performance of Remote Laser Welded AA6063 Fillet Lap Joint in Automotive Battery Tray Construction

2021 ◽  
Vol 11 (10) ◽  
pp. 4522
Author(s):  
Tianzhu Sun ◽  
Pasquale Franciosa ◽  
Conghui Liu ◽  
Fabio Pierro ◽  
Darek Ceglarek
Keyword(s):  
Laser Welding ◽  
Fusion Zone ◽  
Aluminium Alloys ◽  
Mechanical Performance ◽  
Lap Joints ◽  
Fatigue Durability ◽  
Micro Cracks ◽  
Remote Laser Welding ◽  
Weld Fatigue ◽  
Weld Root

Remote laser welding (RLW) has shown a number of benefits of joining 6xxx aluminium alloys such as high processing speed and process flexibility. However, the crack susceptibility of 6xxx aluminium alloys during RLW process is still an open problem. This paper experimentally assesses the impact of transverse micro cracks on joint strength and fatigue durability in remote laser welding of AA6063-T6 fillet lap joints. Distribution and morphology of transverse micro cracks were acquired by scanning electron microscope (SEM) on cross-sections. Grain morphology in the weld zone was determined by electron backscatter diffraction (EBSD) while static tensile and dynamic fatigue tests were carried out to evaluate weld mechanical performance. Results revealed that increasing welding speed from 2 m/min to 6 m/min did not introduce additional transverse micro cracks. Additionally, welding at 2 m/min resulted in tensile strength improvement by 30% compared to 6 m/min due to the expansion of fusion zone, measured by the throat thickness, and refinement of columnar grains near fusion lines. Furthermore, the weld fatigue durability is significantly higher when fracture occurs in weld root instead of fusion zone. This can be achieved by increasing weld root angle with optimum weld fatigue durability at around 55°.

Effect of Ni foil thickness on the microstructure of fusion zone during PHS laser welding

2020 ◽  
Vol 125 ◽  
pp. 106014 ◽  
Author(s):  
Xiaonan Wang ◽  
Zhenghui Zhang ◽  
Zengrong Hu ◽  
Qian Sun ◽  
Hongshuang Di ◽  
...  
Keyword(s):  
Laser Welding ◽  
Fusion Zone ◽  
Foil Thickness

scholarly journals Fusion zone purification of metal containing oxide inclusions via laser welding

2005 ◽  
Vol 40 (15) ◽  
pp. 4125-4127 ◽  
Author(s):  
M. L. Hu ◽  
T. C. Yang ◽  
H. C. Wu ◽  
C. Chen
Keyword(s):  
Laser Welding ◽  
Fusion Zone ◽  
Oxide Inclusions ◽  
Zone Purification

Numerical Simulation of Fusion Zone Shape of Lotus-type Porous Iron by Laser Welding

2011 ◽  
Vol 29 (3) ◽  
pp. 53s-57s
Author(s):  
Takuya TSUMURA ◽  
Hideo NAKAJIMA ◽  
Kazuhiro NAKATA
Keyword(s):  
Numerical Simulation ◽  
Laser Welding ◽  
Fusion Zone ◽  
Porous Iron

scholarly journals Fusion Zone Microstructural Evolution of Al-10% Si Coated Hot Stamping Steel during Laser Welding

2019 ◽  
Vol 59 (1) ◽  
pp. 136-143 ◽  
Author(s):  
Chang Wook Lee ◽  
So Youn Kim ◽  
Soon Geun Jang ◽  
Ga Young Shin ◽  
Ji Hong Yoo
Keyword(s):  
Laser Welding ◽  
Fusion Zone ◽  
Microstructural Evolution ◽  
Hot Stamping ◽  
Hot Stamping Steel

scholarly journals High-Power Fiber Laser Welding of High-Strength AA7075-T6 Aluminum Alloy Welds for Mechanical Properties Research

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7498
Author(s):  
Abdel-Monem El-Batahgy ◽  
Olga Klimova-Korsmik ◽  
Aleksandr Akhmetov ◽  
Gleb Turichin
Keyword(s):  
Mechanical Properties ◽  
Laser Welding ◽  
Fiber Laser ◽  
Fusion Zone ◽  
High Power ◽  
Heat Input ◽  
Welded Joint ◽  
High Strength ◽  
Residual Tensile Stress ◽  
Fiber Laser Welding

The results disclosed that both the microstructure and mechanical properties of AA7075-T6 laser welds are considerably influenced by the heat input. In comparison with high heat input (arc welding), a smaller weld fusion zone with a finer dendrite arm spacing, limited loss of alloying elements, less intergranular segregation, and reduced residual tensile stress was obtained using low heat input. This resulted in a lower tendency of porosity and hot cracking, which improved the welded metal’s soundness. Subsequently, higher hardness as well as higher tensile strength for the welded joint was obtained with lower heat input. A welded joint with better mechanical properties and less mechanical discrepancy is important for better productivity. The implemented high-power fiber laser has enabled the production of a low heat input welded joint using a high welding speed, which is of considerable importance for minimizing not only the fusion zone size but also the deterioration of its properties. In other words, high-power fiber laser welding is a viable solution for recovering the mechanical properties of the high-strength AA 7075-T6 welds. These results are encouraging to build upon for further improvement of the mechanical properties to be comparable with the base metal.

scholarly journals Laser Oscillating of Nickel Alloyed Welds on Press-hardened Steel

2021 ◽  
Author(s):  
Qian Sun ◽  
Zhenghui Zhang ◽  
Xiaonan Wang ◽  
Qingyu Zhang ◽  
Zhenguang Liu
Keyword(s):  
Laser Welding ◽  
Fusion Zone ◽  
Welded Joints ◽  
Hardened Steel ◽  
Weld Width ◽  
Ni Content ◽  
Elemental Profile ◽  
Δ Ferrite ◽  
Linear Laser

Abstract Laser oscillating welding was employed to fabricate Al-Si coated press-hardened steel (PHS) to improve the element homogeneity in the fusion zone. Three oscillation amplitudes that are 0 mm, 0.5 mm and 1.3 mm were studied in this present. Ni foil of 0.06 mm thickness was used as an interlayer between two tailored PHS welded. Welds defects was absent for any oscillation amplitudes, and weld width increased with increasing oscillation amplitudes. Compared to linear laser welding, Ni and Al had an uneven elemental profile due to strong stirring force, full martensite was achieved in fusion zone. However, δ-ferrite was present with oscillation amplitudes increased to 1.3 mm, since Ni content had a sharp descent compared to Al. Tensile srtength of welded joints was not influnced by altering oscillation amplitudes.

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