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ANALYSIS OF HEAT INPUT VARIATION AFFECTED TO AFFECTED ZONE WIDTH ON 3G POSITION SMAW METHOD FOR SHIP HULL

Dinda yuli Handayani orcid  -  Teknik manufaktur kapal, Politeknik Negeri Banyuwangi, Indonesia
*Hery Inprasetyobudi  -  Teknik Manufaktur Kapal, Politeknik Negeri Banyuwangi, Indonesia
Abdul Rohman  -  Teknik Manufaktur Kapal, Politeknik Negeri Banyuwangi, Indonesia
Open Access Copyright (c) 2022 Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan
Creative Commons License This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

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Abstract
Shielded Metal Arc Welding (SMAW) is used in the ship industry because it is simple. The purpose of this study was to determine the results of the non-destructive analysis of the liquid penetrant test, metallographic testing (macro photo), tensile testing, bending testing and rockwell C type hardness testing on SMAW welding in 3G positions. The type of material used is ST 37 with variations in heat input based on variable electric current. The results obtained are, in the bending test with a heat input variation of 3,543 kj/mm, the most welding defects. In the tensile test based on the Lloyd's Register rule, the heat input variation is 3,543 kj/mm, the yield strength is 226,4 Mpa, the average tensile strength is 355 Mpa, the average elongation value is 14,1%, it does not meet. Variation of heat input 3,955 kj/mm average elongation value of 19,8% does not meet. In the HAZ macro area test, the widest average value was found at the heat input variation of 3,955 kj/mm of 7 mm. In testing the hardness of the HAZ area to base metal, the highest increase value is 18% at the heat input of 3,630 kj/mm and the lowest value is 8% at the heat input variation of 3,543 kj/mm.
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Keywords: SMAW, Heat Input, HAZ, Mechanical Strength, Lloyd’s Register
Funding: Politekniuk Negeri Banyuwangi

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