Study on The Thermal Distortion, Hardness, and Microstructure of St 37 Steel Plate Joined Using FCAW
Date
2019-10-03Author
Maijuansyah, Maijuansyah
Pradana, Yanuar Rohmat Aji
Jatisukamto, Gaguk
Solichin, Solichin
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This study sets out to investigate the distortion angle, microstructure, and hardness of St 37 steel plate
weld joint produced by FCAW using the welding current of 80, 110, and 140 A. By using flat position,
CO2 and E71T-1 wire were utilized as a shielding gas and electrode filler, respectively. The distortion
angle measurement was done on 3 different locations of the welded sample perpendicular to weld
direction by using bevel protractor. The micro Vickers tests were then applied gradually at the crosssectional
surface
with
a
distance
of
0,
5,
10
and
15
mm
from
weld
centerline
using
the
load
of
300
g
for
indentation
time
of
15
s.
A
series
of
microstructural observations was subsequently directed on
cross-sectional weld joint regions including base metal, heat-affected zone (HAZ) and weld metal to
investigate the microstructural transformation. From the results, it can be observed that increasing
welding current can reduce the hardness at all indentation regions as well as inducing a higher level of
thermal distortion occurred on a weld joint, especially at HAZ. The microstructural transformation was
also observed at sample welded using various welding current. Both heat input and cooling rate
subjected to the welded sample played an important role to characterize their properties.
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- LSP-Jurnal Ilmiah Dosen [7292]