Microstructure and hardness of Al-Mg-Si weldments produced by pulse GTA welding

This paper describes the effects of pulsed TIG welding process parameters (pulse duration, peak current, and pulse frequency) on the microstructure and microhardness of Al-0.8%Mg-0.5%Si (6061) alloys. It was observed that pulse TIG welding produced finer grain structure of weld metal than convention...

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Bibliographic Details
Published in:International journal of advanced manufacturing technology 2008-03, Vol.36 (3-4), p.263-269
Main Authors: Manti, Rajesh, Dwivedi, D. K., Agarwal, A.
Format: Article
Language:English
Subjects:
Aluminum
CAE) and Design
Computer-Aided Engineering (CAD
Engineering
Gas tungsten arc welding
Grain structure
Industrial and Production Engineering
Magnesium
Mechanical Engineering
Media Management
Metallurgical constituents
Microhardness
Microstructure
Original Article
Process parameters
Pulsation
Pulse duration
Silicon
Weld metal
Welding parameters
Weldments
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Summary:This paper describes the effects of pulsed TIG welding process parameters (pulse duration, peak current, and pulse frequency) on the microstructure and microhardness of Al-0.8%Mg-0.5%Si (6061) alloys. It was observed that pulse TIG welding produced finer grain structure of weld metal than conventional TIG welding (without arc pulsation). An increase in the pulse frequency has been found to refine the aluminium and eutectic grain structure of weld metal especially when welding is done using short pulse duration. Long pulse duration lowers the pulse frequency up to which refinement of constituents in weld metal takes place. Effect of the pulse frequency on the grain structure was found to be determined by pulse duration. For a given pulse frequency, long pulse duration produced a coarser structure than short pulse duration. An increase in the peak current coarsened the grain structure.
ISSN:0268-3768
1433-3015
DOI:10.1007/s00170-006-0849-z