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Influence of Welding Speed on Tensile and Impact Properties of Friction Stir Welded High Strength Low Alloy Steel Joints


Affiliations
1 Centre for Materials Joining & Research (CEMAJOR), Dept., of Manufacturing Engg, Annamalai University, Annamalainagar, Tamilnadu, India
2 Marine Metallurgy Dept., Naval Materials Research Laboratory (NMRL), Ambernath, Mumbai, Maharastra, India
     

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Friction Stir Welding (FSW) of high strength low alloy (HSLA) steel has drawn attention of researchers worldwide owing to its many benefits in construction of warships. In order to improve the weld quality and tool life, it is important to optimize the welding speed with the objective of producing defect free friction stir welded HSLA steel joints with excellent combination of strength and toughness. Hence, in this investigation an attempt has been made to understand the influence of welding speed on tensile and impact toughness properties of friction stir welded high strength low alloy (HSLA) steel joints. Five different welding speeds (20, 25, 30, 35 and 40 mm/min respectively) and constant tool rotational speed (600 rpm) are used to fabricate the HSLA steel joints. Due to the formation of lath upper bainite and acicular ferrite microstructure in the stir zone under optimum heat input condition could be the reason for superior mechanical properties of the joint fabricated using welding speed of 30 mm/min compared to other joints.

Keywords

Friction Stir Welding, Welding Speed, HSLA Steel, Tensile Properties.
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  • Influence of Welding Speed on Tensile and Impact Properties of Friction Stir Welded High Strength Low Alloy Steel Joints

Abstract Views: 257  |  PDF Views: 1

Authors

S. Ragu Nathan
Centre for Materials Joining & Research (CEMAJOR), Dept., of Manufacturing Engg, Annamalai University, Annamalainagar, Tamilnadu, India
S. Malarvizhi
Centre for Materials Joining & Research (CEMAJOR), Dept., of Manufacturing Engg, Annamalai University, Annamalainagar, Tamilnadu, India
V. Balasubramanian
Centre for Materials Joining & Research (CEMAJOR), Dept., of Manufacturing Engg, Annamalai University, Annamalainagar, Tamilnadu, India
A. G. Rao
Marine Metallurgy Dept., Naval Materials Research Laboratory (NMRL), Ambernath, Mumbai, Maharastra, India

Abstract


Friction Stir Welding (FSW) of high strength low alloy (HSLA) steel has drawn attention of researchers worldwide owing to its many benefits in construction of warships. In order to improve the weld quality and tool life, it is important to optimize the welding speed with the objective of producing defect free friction stir welded HSLA steel joints with excellent combination of strength and toughness. Hence, in this investigation an attempt has been made to understand the influence of welding speed on tensile and impact toughness properties of friction stir welded high strength low alloy (HSLA) steel joints. Five different welding speeds (20, 25, 30, 35 and 40 mm/min respectively) and constant tool rotational speed (600 rpm) are used to fabricate the HSLA steel joints. Due to the formation of lath upper bainite and acicular ferrite microstructure in the stir zone under optimum heat input condition could be the reason for superior mechanical properties of the joint fabricated using welding speed of 30 mm/min compared to other joints.

Keywords


Friction Stir Welding, Welding Speed, HSLA Steel, Tensile Properties.