1
views
0
recommends
+1 Recommend
0 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found

      Effect of laser welding speed on the weld quality of a 5A06 aluminum alloy Translated title: Auswirkung der Laserschweißgeschwindigkeit auf die Nahtqualität einer Aluminiumlegierung 5A06

      research-article

      Read this article at

      ScienceOpenPublisher
      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          Laser butt welding was carried out for the joining of 5A06 aluminum alloy sheet by using 6 KW fiber laser. The effect of welding speed on the surface morphology, microstructure, micro-hardness, tensile strength and porosity were studied by means of optical microscopy (OM), a scanning electron microscope (SEM), an energy dispersive spectrometer (EDS), a Vickers hardness tester and a universal mechanical tensile test. The results show that the weld macro morphology tends to be smooth and the surface defects are reduced with an increase in welding speed. The heat-affected zone was very small due to the large cooling rate. The columnar dendrites grow from the fusion line along the direction of the temperature gradient. The microstructure of the weld zone was in the form of equiaxed grains. The micro-hardness of the weld was lower than that of the base material. The micro-hardness and the tensile strength were gradually increased with an increase in welding speed. When the welding speed is 12 mm × s −1, the micro-hardness and the tensile strength were increased to 96.5 % and 56.2 % of the base mental, respectively. The porosity ratio decreased at first, and then increased with the increase in welding speed. The lowest porosity ratio was 1.99 % when the welding speed was 12 mm × s −1. In summary, the quality of the weld was better when the welding speed was 12 mm × s −1.

          Kurzfassung

          Für den vorliegenden Beitrag wurden Schweißungen einer Aluminiumlegierung 5A06 mit einem 6 kW Faserlaser in Wannenlage ausgeführt. Die Auswirkung der Schweißgeschwindigkeit auf die Oberflächenmorphologie, die Mikrostruktur, die Mikrohärte, die Zugfestigkeit und die Porenbildung wurden mittels Lichtmikroskopie (Optical Microscopy – OM), Rasterelektronenmikroskopie (Scanning Electron Microscopy – SEM) energiedispersiver Spektroskopie (Energy Dispersive Spectroscopy – EDS) eines Vickers-Härteprüfgerät und einer Universalzugprüfmaschine untersucht. Die Ergebnisse zeigen, dass die Oberflächenmorphologie eine glattere Tendenz aufweist und dass die Oberflächendefekte abnehmen, wenn die Schweißgeschwindigkeit erhöht wird. Die Wärmeeinflusszone (heat affected zone – HAZ) war aufgrund der hohen Abkühlgeschwindigkeit sehr schmal. Die Dendriten wachsen im Schweißgut ausgehend von der Schmelzlinie in Richtung des Temperaturgradienten. Die Mikrostruktur der Schweißverbindung wies gleichachsige Körner auf. Die Mikrohärte der Schweißverbindung lag unter der des Grundwerkstoffes. Mit zunehmender Schweißgeschwindigkeit stiegen die Mikrohärte und die Zugfestigkeit graduell an. Bei einer Schweißgeschwindigkeit von 12 mm × s −1 wurden die Mikrohärte und die Zugfestigkeit auf 96.5 % und 56.2 % entsprechend gegenüber dem Grundwerkstoff erhöht. Die Porösität nahm zunächst ab, dann aber mit weiterer Erhöhung der Schweißgeschwindigkeit zu. Die niedrigste Porenbildung ergab sich mit 1.99 %, als die Schweißgeschwindigkeit 12 mm × s −1 betrug. Zusammenfassend ergab sich, dass die Schweißnahtqualität besser war, wenn die Schweißgeschwindigkeit 12 mm × s −1 betrug.

          Related collections

          Most cited references32

          • Record: found
          • Abstract: not found
          • Article: not found

          Recent developments in advanced aircraft aluminium alloys

            Bookmark
            • Record: found
            • Abstract: not found
            • Article: not found

            Fiber laser welding of austenitic steel and commercially pure copper butt joint

              Bookmark
              • Record: found
              • Abstract: not found
              • Article: not found

              Numerical study of keyhole dynamics and keyhole-induced porosity formation in remote laser welding of Al alloys

                Bookmark

                Author and article information

                Journal
                mp
                Materials Testing
                Carl Hanser Verlag
                0025-5300
                2195-8572
                15 November 2018
                : 60
                : 11
                : 1085-1092
                Affiliations
                1 Beijing, P. R. China
                Author notes
                [* ] Correspondence Address, Prof. Dr. Hanguang Fu, School of Materials Science and Engineering, Beijing University of Technology, Number 100, Pingle Garden, Chaoyang District, Beijing 100124, P. R. China, E-mail: hgfu@ 123456bjut.edu.cn

                Xiaoli Ma, born in 1991, is a Master's candidate at the Beijing University of Technology, China. She obtained her Bachelor's degree at the School of Mechanical Engineering at Shandong Jiaotong University, China in 2014. Her research interests mainly focus on aluminum alloy materials.

                Dr. Jian Lin, born in 1979, is an Associate Professor at Beijing University of Technology, P. R. China. He obtained his PhD at the Department of Mechanical Engineering, Tsinghua University, Beijing, China in 2006. His research interests mainly focus on the joining method of steel to aluminum and welding residual stress analysis.

                Jiang Ju, born in 1990, is a PhD candidate at Shanghai Jiao Tong University, China. He obtained his Master's degree at the school of Materials Science and Engineering at Beijing University of Technology in 2017. His research interests mainly focus wear-resistant materials, superalloy and 3D printing.

                Prof. Dr. Yongping Lei, born in 1957, is a Professor at Beijing University of Technology, China. He obtained his PhD at the School of Materials Science and Engineering at Xi'an Jiaotong University, China in 1994. His research interests mainly focus on the development of lead-free solder paste, the reliability of solder joint and welding.

                Prof. Dr. Hanguang Fu, born in 1964, is a Professor at the Beijing University of Technology, China. He obtained his PhD at the School of Materials Science and Engineering at Xi'an Jiaotong University in 2004. His research interests mainly focus on solidification control.

                Article
                MP111253
                10.3139/120.111253
                99d1310a-b38a-41d7-ad02-5f444b26f84a
                © 2018, Carl Hanser Verlag, München
                History
                Page count
                References: 32, Pages: 8
                Categories
                Fachbeiträge/Technical Contributions

                Materials technology,Materials characterization,Materials science
                Materials technology, Materials characterization, Materials science

                Comments

                Comment on this article