Thermal cycle and microstructure of backing weld in double-sided TIG arc horizontal welding of high-strength steel thick plate

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• 作者：Jun Xiong ; Shuyi Liu ; Guangjun Zhang
• 关键词：Double ; sided arc welding ; High ; strength steel ; Horizontal welding ; Thermal cycle ; Microstructure
• 刊名：The International Journal of Advanced Manufacturing Technology
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：81
• 期：9-12
• 页码：1939-1947
• 全文大小：3,630 KB
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• 作者单位：Jun Xiong (1)
  Shuyi Liu (1)
  Guangjun Zhang (1)
  
  1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, West Straight Street 92, Harbin, 150001, 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

Double-sided arc horizontal welding is a new process for high-strength steel thick plate. This study aims at studying thermal cycle and microstructure of backing weld. The special heating cycle with two peaks in double-sided double-arc welding is beneficial to the generation of microstructure with good strength and toughness, due to the effect of preheating and postheating. The microstructure was a mixture of ferrite and lath martensite. The heat-affected zone (HAZ) in the root area was overheated, owing to the shape of groove in the horizontal welding, resulting in meshes in the grain boundary. The meshes were analyzed to be the tempered martensite. Hardness tests showed that there were some softened regions in the HAZ on account of high-temperature tempering. Keywords Double-sided arc welding High-strength steel Horizontal welding Thermal cycle Microstructure