Optimization of fiber laser welding parameters for high strength aluminium alloy AA7075-T6

2021 ◽  
Author(s):  
P.S. Dhanaraj ◽  
C. Rathinasuriyan
Keyword(s):  
Laser Welding ◽  
Fiber Laser ◽  
Aluminium Alloy ◽  
High Strength ◽  
Welding Parameters ◽  
Fiber Laser Welding

Effect of Butt Joint Gap to High-Strength Automobile Steel of Fiber Laser Welding

2011 ◽  
Vol 38 (6) ◽  
pp. 0603013
Author(s):  
陈根余 Chen Genyu ◽  
陈飞 Chen Fei ◽  
张屹 Zhang Yi ◽  
李时春 Li Shichun ◽  
康斌 Kang Bin
Keyword(s):  
Laser Welding ◽  
Fiber Laser ◽  
High Strength ◽  
Butt Joint ◽  
Fiber Laser Welding ◽  
Joint Gap ◽  
Automobile Steel

Influence of Welding Parameters on weld Depth and Porosity in High Power Fiber Laser Welding

2013 ◽  
Vol 40 (11) ◽  
pp. 1103004
Author(s):  
赵琳 Zhao Lin ◽  
塚本进 Tsukamoto Susumu ◽  
荒金吾郎 Arakane Goro ◽  
张岩 Zhang Yan ◽  
田志凌 Tian Zhiling
Keyword(s):  
Laser Welding ◽  
Fiber Laser ◽  
High Power ◽  
Welding Parameters ◽  
Fiber Laser Welding ◽  
Weld Depth

Study on Fiber Laser Welding for DP780 High Strength Steel

2011 ◽  
Vol 328-330 ◽  
pp. 48-53
Author(s):  
Tao Huang ◽  
Li Jun Xin ◽  
Zhi Yong Wang
Keyword(s):  
Fiber Laser ◽  
High Strength Steel ◽  
Steel Plate ◽  
High Strength ◽  
Lower Bainite ◽  
Welding Parameters ◽  
Fiber Laser Welding ◽  
Welding Seam ◽  
Hardness Values ◽  
Softened Zone

Welding experiments of DP780 high strength steel plate produced by Baosteel with IPG YLR-6000-ST2 fiber laser have been processed. The influence of welding parameters on welding quality has been investigated. As well as microstructure and mechanical character of welding seam have been analyzed. The results show that the joint appearance of DP780 high strength steel welded with IPG YLR-6000-ST2 fiber laser has good performance and the mechanics property is good without fit-up gap. The microstructure of weld bead is columnar crystals, mainly lath-shaped ferrite, needle-like lower bainite and a small amount of martensite. Heat-affected zone is narrow and the grain grows with little size. The measured micro-hardness values of the sample decrease smoothly from weld center to base metal and there does not have softened zone.

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.

Investigation on keyhole mode fiber laser welding of SS 316 in a self-protected atmosphere

2019 ◽  
Vol 233 (18) ◽  
pp. 6602-6615 ◽  
Author(s):  
Sohini Chowdhury ◽  
Yadaiah Nirsanametla ◽  
Muralidhar Manapuram
Keyword(s):  
Laser Welding ◽  
Fiber Laser ◽  
Microstructural Characterization ◽  
Welding Parameters ◽  
Atmospheric Conditions ◽  
Fiber Laser Welding ◽  
Point Energy ◽  
Weld Profile ◽  
Ar Gas ◽  
Bead Profile

This work focuses on examining the influence of welding parameters under different welding atmospheres and evaluation of keyhole profile during fiber laser welding operation. The experiments are carried out in two different welding atmospheres, namely self-protected atmosphere of Ar gas and open atmospheric conditions. The effect of these two atmospheric conditions on weld profile formation and dimensions, and microstructural evolution for SS 316 plates are examined. In addition, the keyhole profile is evaluated by using a semi-analytical mathematical model, a point-by-point energy balance determination at the keyhole wall, which is mapped with experimentally measured weld macrographs for similar welding conditions. It has been determined that the weld quality is profound in the case of a self-protected atmosphere with respect to aspect ratio, weld defects, and microstructural characterization. Moreover, better weld bead profile and cleaner weld seam on the upper surface is determined in samples welded in a self-protected atmosphere.

scholarly journals Numerical And Experimental Analysis of Temperature Distribution And Melt Flow In Fiber Laser Welding of Inconel 625

2021 ◽  
Author(s):  
Iskander Tlili ◽  
Dumitru Baleanu ◽  
S. Mohammad Sajadi ◽  
Ferial Ghaemi
Keyword(s):  
Temperature Distribution ◽  
Laser Welding ◽  
Fiber Laser ◽  
Experimental Results ◽  
Coarse Grained ◽  
Inconel 625 ◽  
Welding Parameters ◽  
Melt Flow ◽  
Fiber Laser Welding ◽  
Speed Accuracy

Abstract In these days, laser is a useful and valuable tool. Low input heat, speed, accuracy, and high controllability of laser welding have led to widespread use in various industries. Nickel-based superalloys are creep-resistant materials used in high-temperature conditions. Also, these alloys have high strength, fatigue, and suitable corrosion resistance. Inconel 625 is a material that is strengthened by a complex deposition mechanism. Therefore, the parameters related to laser welding affect the microstructure and mechanical properties. Therefore, in this study, the effect of fiber laser welding parameters on temperature distribution, weld bead dimensions, melt flow velocity, and microstructure was investigated by finite volume and experimental methods. In order to detect the temperature history during continuous laser welding, two thermocouples were considered at a distance of 2 mm from the welding line. The heat energy from the laser beam was modeled as surface and volumetric heat flux. The results of numerical simulation showed that Marangoni stress and buoyancy force are the most important factors in the formation of the flow of liquid metal. Enhancing the laser power to 400 W led to the expansion of the width of the molten pool by 1.44 mm, which was in good agreement with the experimental results. Experimental results also showed that increasing the temperature from 500 °C around the molten pond leads to the formation of a coarse-grained austenitic structure.

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