Microstructures and mechanical properties of H62 brass-316L stainless steel in overlap welded joints by continuous-wave laser

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• 作者：Yang Li ; Shengsun Hu ; Junqi Shen ; Lala Liu
• 关键词：Microstructure ; Weld joint ; Microhardness ; Laser welding ; Stainless ; Steel ; Brass
• 刊名：The International Journal of Advanced Manufacturing Technology
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：79
• 期：1-4
• 页码：627-634
• 全文大小：3,453 KB
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• 作者单位：Yang Li (1) (2)
  Shengsun Hu (1) (2)
  Junqi Shen (1) (2)
  Lala Liu (1) (2)
  
  1. School of Materials Science and Engineering, Tianjin University, Weijin Road 92, Nankai District, Tianjin, 300072, China
  2. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin, 300072, China
  
• 刊物类别：Engineering
• 刊物主题：Industrial and Production Engineering
  Production and Logistics
  Mechanical Engineering
  Computer-Aided Engineering and Design
  
• 出版者：Springer London
• ISSN：1433-3015

文摘

A continuous-wave Nd/YAG laser was used to weld overlap joints between H62 brass and 316?L stainless steel. Effects of laser power and welding speed on microstructure, element distribution, microhardness, and tensile shear strength were investigated. Optical microscopy (OM), scanning electron microscope (SEM), and energy dispersive spectrometer (EDS) were used to analyze the microstructure and the content of zinc in the welded joints. Microhardness test and tensile test were performed to identify the mechanical property of the obtained overlap joints. The results showed that penetration-to-width ratio, evaporation of zinc, and microhardness increase with the increase of welding heat input. The elements in stainless steel and brass had homogeneous distribution and mixing. The coarse microstructure in the fusion zone was the main factor to reduce the tensile shear force of the welded joint, which resulted in the poor mechanical properties. The suitable range of the welding heat input was 37.5?~-0?J/mm.