This study aims to determine the level of penetration depth using SMAW (Shielded Metal Arc Welding)
Process based on the polarity type of DCRP (Direct Current Reverse Polarity) and DCSP (Direct Current
Straight Polarity). This research used ASTM A36 Low Carbon Steel plate with thickness of 6 mm and length
of 200 mm, Electrode E7018 LB-52-18 ∅ 3.2 mm, and with current parameters of 90 A, 100 A, 110 A, 120
A and 130 A and 70 ° welding arc angle. The method used the experimental method. Data collection
techniques used direct observation techniques and descriptive statistical data analysis techniques. Testing
the penetration depth of the welds with a macrographic test was conducted using an optical microscope. The
test results show that DCRP has more depth than DCSP when the current is 90 A with a difference of 0.38
mm. When the current is 100 A, DCRP is deeper with a difference of 0.312 mm compared to DCSP. The
third experiment, with a current of 110 A DCRP, was deeper with a difference of 0.05 mm compared to
DCSP. During the fourth and fifth experiments, DCRP was deeper with a difference of 0.21 mm compared
to DCSP at 120 A and DCRP was 0.324 mm deeper than DCSP at 130 A. It can be concluded that the effect
of DCRP and DCSP polarity on the depth of penetration using E7018 electrodes using ASTM low carbon
steel A36, DCRP polarity has a deeper penetration depth compared to DCSP.
Copyright © 2021. Journal of Mechanical Engineering Science and Technology.
All rights reserved.
Keywords: SMAW, DCRP, DCSP, penetration depth, macrographic test
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