Abdullah, Muflih (2026) ANALISA PENGARUH VARIASI BEVEL DAN PENGGUNAANBACKING CERAMIC TERHADAP KEKUATAN DAN DEFECT MATERIAL BAJA GRADE A PENGELASAN Shield Metal Arc Welding (SMAW). SKRIPSI.
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Abstract
Grade A steel plates are materials that have high resistance to corrosion, so they are specifically used in the marine and offshore construction industries, including in the manufacture of main structures such as ship hulls. Several SMAW welding methods using ceramic backing and variations in single V bevel angles. This study aims to analyze the influence of bevel angle variations (30°, 40°, and 50°) and the use of ceramic backing on the mechanical strength and welding defects of Grade A steel using the Shielded Metal Arc Welding (SMAW) method. Welding was performed using multipass welding with four passes. The research method used was experimental, involving macro visual testing, dye penetrant testing, tensile testing, and impact testing to evaluate the quality of the welded joints. The results of the macro visual and dye penetrant tests showed that specimens without backing ceramic (P1) had more defects, such as incomplete penetration, spatter, and pinholes, compared to specimens with backing ceramic (P2). In the impact test, all P1 and P2 specimens met the minimum ASTM E23 standard with an average impact value of approximately 23.9–24.1 J/mm², indicating that all specimens met the minimum standard set by ASTM E23 for welded joint materials, which is 10 J/mm². Meanwhile, in the tensile test, it was shown that the use of ceramic backing significantly influenced the improvement in the mechanical strength of the welded joint. The highest ultimate tensile strength (UTS) was achieved by the P2 specimen with a 50° bevel angle, at 576.1 MPa. Additionally, the P2 specimen with a 40° bevel also recorded the highest elongation of 25%, indicating optimal ductility. Overall, it can be concluded that the combination of the appropriate bevel angle (especially at 40° and 50°) and the use of ceramic backing significantly improves the quality of the welded joint in terms of tensile strength, impact toughness, and minimal weld defects. The results of this study are expected to serve as a practical reference for developing more efficient and reliable welding procedures, particularly in the construction and shipbuilding industries that prioritize highquality welded joints. Keywords: Bevel Variation, Ceramic Backing, Mechanical Strength, Grade A Steel, Shield Metal Arc Welding (SMAW).
| Item Type: | Article |
|---|---|
| Additional Information: | 210205002 |
| Subjects: | Teknik Transportasi Laut |
| Depositing User: | AMNI Perpustakaan Semarang |
| Date Deposited: | 16 Apr 2026 02:02 |
| Last Modified: | 16 Apr 2026 02:02 |
| URI: | http://repository.unimar-amni.ac.id/id/eprint/6856 |
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