An investigation of TIG welding parameters on microhardness and microstructure of heat affected zone of HSLA steel
Nowadays a wide variety of metal joining methods are used in fabrication industries. In this study, the effect of various welding parameters of the TIG welding process on microhardness, depth, and microstructure of the heat-affected zone (HAZ) of L450 HSLA steel and optimizing these process param...
| Main Authors: | , , |
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| Format: | Conference or Workshop Item |
| Language: | English English English |
| Published: |
IOP Publishing
2018
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/63770/ http://irep.iium.edu.my/63770/ http://irep.iium.edu.my/63770/ http://irep.iium.edu.my/63770/1/P135%202018%20IOP_MSE%20Musa.pdf http://irep.iium.edu.my/63770/7/63770-%20An%20Investigation%20of%20TIG%20welding%20parameters%20on%20microhardness%20and%20microstructure%20SCOPUS.pdf http://irep.iium.edu.my/63770/13/63770_An%20investigation%20of%20TIG%20welding%20parameters%20on%20microhardness%20and%20microstructure_WoS.pdf |
| Summary: | Nowadays a wide variety of metal joining methods are used in fabrication
industries. In this study, the effect of various welding parameters of the TIG welding process
on microhardness, depth, and microstructure of the heat-affected zone (HAZ) of L450 HSLA
steel and optimizing these process parameters following Taguchi experimental design was
investigated. The microhardness tended to increase significantly with the increase of welding
speed from 1.0 to 2.5 mm/s whereas the width of HAZ decreased. The current and arc voltage
was found to be less significant in relative comparison. Microstructures of the welded samples
were also studied to analyze the changes in the microstructure of the material in terms of
ferrite, pearlite, bainite, and martensite formations. Welding speed was found to be the most
significant factors leading to changes in microhardness and metallurgical properties. The
increase of welding heat input caused an increase in width (depth) of HAZ and the growth of
prior austenite grains and then enlarged the grain size of coarse grain heat affected zone
(CGHAZ). However, the amount of martensite in the HAZ decreased accompanied by an
opposite change of paint. It was observed that the hardness properties and the microstructural
feature of HAZ area was strongly affected by the welding parameters. |
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