AFFANDY, RAHMAT (2026) Optimasi Laju Aliran Gas Dan Ketebalan Pipa Terhadap Kekuatan Tarik Sambungan Las Tig Pada Material Hi-Ten Steel. Undergraduate thesis, Universitas Pembangunan Nasional "Veteran" Jawa Timur.
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Abstract
The increasing use of electric bicycles demands the manufacturing of strong and lightweight frames using High-Tensile (Hi-Ten) Steel. Tungsten Inert Gas (TIG) welding is frequently applied in its fabrication process; however, it poses a risk of defects on thin materials if parameters are not properly controlled. The primary issue in this fabrication is the uncertainty regarding the exact level of influence and the precise combination of shielding gas flow rate and pipe thickness on the joint strength. Although previous studies have examined gas parameter variations in alloy and stainless steels, a gap analysis reveals a significant lack of specific research optimizing these two parameters on Hi-Ten Steel pipes for bicycle frame applications. This study aims to analyze the effect of gas flow rate and pipe thickness, as well as to determine the optimal parameter combination to achieve maximum tensile strength. A quantitative experimental method was employed using the Taguchi Orthogonal Array L9 (32) optimization approach. The independent variables included gas flow rate (8, 10, and 12 L/min) and pipe thickness (0.8, 1.0, and 1.2 mm), with tensile testing conducted according to the ASTM E8 standard. Analysis of Variance (ANOVA) results demonstrated that pipe thickness had a highly significant effect (P-value 0.010) on tensile strength, whereas the variation in gas flow rate did not show a significant effect (P-value 0.677). Based on the Signal-to-Noise (S/N) Ratio analysis, it can be concluded that the optimal and most stable parameter combination for TIG welding of Hi-Ten Steel is achieved using a gas flow rate of 12 L/min and a pipe thickness of 1.0 mm, resulting in a value of 352.38 MPa.
| Item Type: | Thesis (Undergraduate) | ||||||||
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| Uncontrolled Keywords: | TIG Welding, Hi-Ten Steel, Gas Flow Rate, Pipe Thickness, Tensile Strength | ||||||||
| Subjects: | T Technology > TJ Mechanical engineering and machinery | ||||||||
| Divisions: | Faculty of Engineering > Departement of Mechanical Engineering | ||||||||
| Depositing User: | 2203601001 Rahmat Affandy | ||||||||
| Date Deposited: | 21 Sep 2026 03:03 | ||||||||
| Last Modified: | 22 Sep 2026 08:06 | ||||||||
| URI: | https://repository.upnjatim.ac.id/id/eprint/60295 |
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