Effect of optical parameters on fiber laser welding of ultrahigh strength steels and weld mechanical properties at subzero temperatures

2016 ◽  
Vol 28 (2) ◽  
pp. 022415 ◽  
Author(s):  
Antti Salminen ◽  
Farhang Farrokhi ◽  
Anna Unt ◽  
Ilkka Poutiainen
Keyword(s):  
Mechanical Properties ◽  
Laser Welding ◽  
Fiber Laser ◽  
Optical Parameters ◽  
Fiber Laser Welding ◽  
Ultrahigh Strength ◽  
Subzero Temperatures ◽  
Ultrahigh Strength Steels

Fiber Laser Welding of Direct-Quenched Ultrahigh Strength Steels: Evaluation of Hardness, Tensile Strength, and Toughness Properties at Subzero Temperatures

2015 ◽  
Vol 137 (6) ◽  
Author(s):  
Farhang Farrokhi ◽  
Jukka Siltanen ◽  
Antti Salminen
Keyword(s):  
Tensile Strength ◽  
Impact Toughness ◽  
Fiber Laser ◽  
Welding Process ◽  
Fiber Laser Welding ◽  
Butt Joints ◽  
Ultrahigh Strength ◽  
Subzero Temperatures ◽  
Ultrahigh Strength Steels ◽  
Strength And Toughness

The recently developed direct-quenched ultrahigh strength steels (UHSS) possess an appropriate combination of high tensile strength and toughness properties at subzero temperatures down to −80 °C, while simultaneously having low carbon contents, which is beneficial for weldability. In this study, butt joints of Optim 960 QC direct-quenched UHSS with a thickness of 8 mm were welded with a 10 kW fiber laser to evaluate the characteristics of the joints within the range of low to high heat inputs possible for this welding process. The mechanical properties of the joints were studied by subjecting the specimens to a number of destructive tests, namely, hardness and tensile testing, as well as impact toughness testing at temperatures of −40 °C and −60 °C. It was found that high quality butt joints with superior tensile strength and good impact toughness properties at −40 °C could be obtained. However, having a high level of all these properties in the joint narrows the process parameters’ window, and the heat input needs to be strictly controlled.

Fiber laser welding of hot stamping steel: effect of in situ annealing on the microstructure and mechanical properties

2020 ◽  
Vol 65 (1) ◽  
pp. 57-65
Author(s):  
Raquel Alvim de Figueiredo Mansur ◽  
Vagner Braga ◽  
Vinicius Machado Mansur ◽  
Daolun Chen ◽  
Milton Sergio Fernandes de Lima
Keyword(s):  
Mechanical Properties ◽  
Laser Welding ◽  
Fiber Laser ◽  
Hot Stamping ◽  
Fiber Laser Welding ◽  
Microstructure And Mechanical Properties ◽  
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.

Analysis of Microstructure and Mechanical Properties of 2A97T3 Al-Li Alloy Fiber Laser Welding Joint

2015 ◽  
Vol 1095 ◽  
pp. 677-683 ◽  
Author(s):  
Zhen Yi ◽  
Li Chen ◽  
En Guang He ◽  
Ming Chang
Keyword(s):  
Mechanical Properties ◽  
Laser Welding ◽  
Fiber Laser ◽  
Base Metal ◽  
Columnar Dendrite ◽  
Fiber Laser Welding ◽  
Columnar Crystal ◽  
Welding Joint ◽  
Microstructure And Mechanical Properties ◽  
Welding Joints

2A97 Al-Li alloy with good comprehensive performance is a new type of Al-Li alloys in our country,in order to meet the ever-increased long-term requirements of aerospace,aviation and armament industries,microstructure and mechanical properties of 2A97Al-Li alloy fiber laser welding joint were analyzed in this paper.The results show that:2A97 Al-Li alloy laser welding joints from welding fusion line to the center of welding seam are non-dendritic equiaxed grain zone,columnar crystal zone,columnar dendrite zone,equiaxed dendrite zone.Precipitates θ,T2 and T1 are probably exited in FZ,hardness of the center of FZ is the lowest.Yield strength of welding joints are about 70% of base metal,tensile strength are approximately 63% of the base metal.

scholarly journals Laser Welding of Ultrahigh Strength Steels at Subzero Temperatures

2016 ◽  
Vol 83 ◽  
pp. 352-361 ◽  
Author(s):  
Benjamin Gerhards ◽  
Uwe Reisgen ◽  
Simon Olschok
Keyword(s):  
Laser Welding ◽  
Ultrahigh Strength ◽  
Subzero Temperatures ◽  
Ultrahigh Strength Steels

Laser absorption in high-power fiber laser welding of stainless steel and aluminum alloy

2008 ◽  
Author(s):  
Naoyuki Matsumoto ◽  
Yousuke Kawahito ◽  
Masami Mizutani ◽  
Seiji Katayama
Keyword(s):  
Stainless Steel ◽  
Aluminum Alloy ◽  
Laser Welding ◽  
Fiber Laser ◽  
High Power ◽  
Fiber Laser Welding ◽  
Laser Absorption
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