scholarly journals Effects of laser focusing properties on weldability in high-power fiber laser welding of thick high-strength steel plate

2017 ◽  
Vol 29 (1) ◽  
pp. 012003 ◽  
Author(s):  
Naoyuki Matsumoto ◽  
Yousuke Kawahito ◽  
Koji Nishimoto ◽  
Seiji Katayama
Keyword(s):  
Laser Welding ◽  
Fiber Laser ◽  
High Power ◽  
High Strength Steel ◽  
Steel Plate ◽  
High Strength ◽  
Fiber Laser Welding ◽  
Laser Focusing ◽  
Focusing Properties

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.

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

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

Structure and Properties of High Power Laser Welding of High Strength Steel B450LAD for Vehicles

2008 ◽  
Vol 35 (12) ◽  
pp. 2047-2051 ◽  
Author(s):  
李亚玲 Li Yaling ◽  
黄坚 Huang Jian ◽  
高志国 Gao Zhiguo ◽  
吴毅雄 Wu Yixiong ◽  
阎启 Yan Qi
Keyword(s):  
Laser Welding ◽  
High Power ◽  
High Strength Steel ◽  
High Strength ◽  
Structure And Properties ◽  
High Power Laser ◽  
Power Laser

High-power fiber laser welding of thick steel at low welding speed

2007 ◽  
Author(s):  
Xudong Zhang ◽  
Eiji Ashida ◽  
Seiji Katayama ◽  
Masami Mizutani ◽  
Yusuke Anma ◽  
...  
Keyword(s):  
Laser Welding ◽  
Fiber Laser ◽  
High Power ◽  
Welding Speed ◽  
Fiber Laser Welding ◽  
Thick Steel
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