Published at : 01 Jul 2022
Volume : IJtech
Vol 13, No 3 (2022)
DOI : https://doi.org/10.14716/ijtech.v13i3.3134
Agus Widyianto | Department of Automotive Engineering Education, Faculty of Engineering, Universitas Negeri Yogyakarta, Jl. Colombo No.1, Karang Gayam, Caturtunggal, Kab. Sleman 55281, Indonesia |
Ario Sunar Baskoro | Department of Mechanical Engineering, Faculty of Engineering, Universitas Indonesia, Jl. Prof. Dr. Sumitro Djojohadikusumo Kampus UI Depok 16424, Indonesia |
Gandjar Kiswanto | Department of Mechanical Engineering, Faculty of Engineering, Universitas Indonesia, Jl. Prof. Dr. Sumitro Djojohadikusumo Kampus UI Depok 16424, Indonesia |
Orbital pipe welding is carried out in this
study by Pulse Current Gas Tungsten Arc Welding (PC-GTAW) without metal filler (autogenous)
of AISI 304L stainless steel pipe. The dimensions of the specimen are 114 mm
outside diameter and the thickness of 3 mm. This study investigates the effect
of pulse current parameters, weld position, and pulse width on the
characteristics of weld geometry, mechanical properties, and microstructure.
The welding method used in this study is the continuous current and pulse
current. The mean current of each parameter is the same at 100 ± 0.5 Amperes,
but in the pulse current, there are variations in peak current, base current,
peak current time, and the base current time. The welding speed used is
constant at 1.4 mm/s. The result of weld geometry on the outside of pipe has
shown that the flat (0°) position is concave and the overhead (180°) position
is convex due to the influence of gravity. The microstructure indicates that
the fine cellular dendritic structures appear at PC-GTAW. The PC-GTAW can
produce good mechanical properties such as the tensile strength and the
micro-hardness. The tensile strength of the specimen is reduced 14.23 % from
the base metal at parameter 65-B and the flat position.
Orbital pipe welding; PC-GTAW; AISI 304L; Weld characteristic
This
study investigates the effect of orbital PC-GTAW on weld characteristics,
welding position, microstructure, and mechanical properties of AISI 304L
stainless steel pipe. In the orbital pipe welding, the weld geometry on the
flat (0°) and overhead (180°) positions were strongly influenced by gravity.
However, in the descendant vertical (90°) and ascendant vertical (270°)
positions weren’t too affected by gravity. The weld geometry on the outside of
the pipe formed at the flat (0°) position was concave, at the overhead (180°)
position was convex, and at the descendant vertical (90°) and ascendant
vertical (270°) positions it tends to be flat. The higher the peak current, the
geometry of the weld formed will be deeper in penetration at several pipe
positions in the orbital pipe welding. PC-GTAW can produce smaller width of HAZ
than CC-GTAW due to in the PC-GTAW, the cooling rate is faster, and heat input
can be controlled. The orbital PC-GTAW of AISI 304L produced good mechanical
properties. The tensile strength of each parameter and welding position was not
much different from the base metal, the largest decrease in the parameter 65-B
at the flat (0°) position of 14.23% from BM. The micro-hardness value will rise
when in the HAZ region, and then it will descend when entering the PMZ region
and back up again when in the WM region. The micro-hardness value in PMZ has
the smallest value compared to the other zones.
This
research is supported by the Master Program to Doctorate for Scholar Excellent
(PMDSU) program of the Ministry of Research & Technology and High Education
(RISTEK DIKTI) 2018 with contract number 6265/UN2.R3.1/HKP05.00/2018.
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