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- Title
Effects of an ultrasonically excited TIG arc on CLAM steel weld joints.
- Authors
Chen, Xizhang; Shen, Zheng; Wang, Jingjun; Chen, Jin; Lei, Yucheng; Huang, Qunying
- Abstract
The objectives of the present study are to research the effects and mechanism of an ultrasonically excited tungsten inert gas (TIG) arc on the comprehensive mechanical properties of China Low Activation Martensitic (CLAM) weld joints. In the arc-ultrasonic process, an ultrasonic power source is coupled to the TIG power source to modulate the welding arc. The influence of various arc-ultrasonic parameters is determined through comparisons of the resulting weld microstructures, impact energy, hardness and tensile properties. The results show that the arc-ultrasonic technique effectively refines the microstructure, provides even distribution of carbides, and improves mechanical performance of the weld metal and HAZ. With increasing ultrasonic power, the impact toughness of the weld metal first increases by up to 80% and then begins to decrease while the hardness and tensile strength of the weld metal exhibit a slight decrease. The optimum matching of arc-ultrasonic excitation parameters and welding parameters improve the comprehensive mechanical properties of CLAM weld metal. Furthermore, PWHT is beneficial to weld metal mechanical properties for both standard and arc-ultrasonic TIG welding.
- Subjects
GAS tungsten arc welding; MICROSTRUCTURE; MECHANICAL behavior of materials; HARDNESS; ULTRASONIC cutting; CARBIDES; STEEL welding; COMPARATIVE studies
- Publication
International Journal of Advanced Manufacturing Technology, 2012, Vol 60, Issue 5-8, p537
- ISSN
0268-3768
- Publication type
Article
- DOI
10.1007/s00170-011-3611-0