Optimasi Multi Respon Proses Pengelasan SMAW Untuk Dissimilar Material Antara Wearplate 500HB Dan 318LN

Yogatama, Marga (2026) Optimasi Multi Respon Proses Pengelasan SMAW Untuk Dissimilar Material Antara Wearplate 500HB Dan 318LN. Masters thesis, Institut Teknonologi Sepuluh Nopember.

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Abstract

Sambungan antara material wearplate (material tahan aus), dan duplex memiliki banyak tantangan, seperti penghilangan tegangan sisa, dan terbentuknya senyawa intermetalik rapuh diantara 2 material ini. Hal ini diharapkan bisa diatasi dengan perlakuan panas dan metode pengelasan yang tepat. Salah satu metode unutk mengetahui kombinasi antar perlakuan panas dan parameter pengelasan yang optimal adalah dengan Metode Taguchi dengan Multi Response Performance Index(MRPI). Metode Taguchi digunakan untuk merancang eksperimen dan menganalisis data, dengan tujuan mengidentifikasi kombinasi parameter pengelasan yang optimal. Sedangkan MRPI adalah metode pembobotan untuk penggabungan multi respon menjadi respon tunggal. Pada penelitian ini akan dilakukan pengelasan SMAW antara material wearplate dengan AISI 318LN. Parameter yang diteliti meliputi lamanya waktu Post Weld Heat Treatment (PWHT),ada 1, 10 dan 20 jam. suhu PWHT sebesar 400oC, 500oC, 600oC. Suhu preheat yang dikenakan pada pengelesan sebesar 100oC 150oC dan 200oC. Arus pengelasan yang digunakan sebesar 60, 90, dan 120 A. Jenis elektroda yang digunakan dalam pengelasan yaitu E2209 dan E8018-B2.. Penelitian ini akan menggunakan orthogonal array L18(2134), dengan 2 kali replikasi. Hasil eksperimen menunjukkan bahwa presentase kontribusi terbesar ada pada temperature PWHT dengan 44%, kemudian elektroda dengan 14% dan Preheat dengan 12%. Kemudian faktor kuat arus dan waktu PWHT tidak dilakukan optimasi, karena memiliki kontribusi 0,05. Kombinasi level optimal ada pada elektroda E2209, preheat 150oC dan PWHT 400oC. Kombinasi ini menghasilkan nilai MRPI 0,83, dengan nilai prediksi antara 0,652-0,865. Sehingga metode taguchi dapat diterima dan dianggap mampu menggambarkan perilaku proses secara akurat, karena hasil konfirmasi berada dalam rentang penerimaan prediksi yang ditentukan pada tingkat kepercayaan 95%. Distribusi kekerasan dan karakter mikrostruktur pada sambungan las E2209-18–AISI 318LN wearplate menunjukkan bahwa perbedaan respons metalurgi dipengaruhi oleh weldmetal serta proses pengelasan. Kombinasi electrode E2209, preheat 150 °C, dan PWHT 400 °C menghasilkan mikrostruktur yang stabil dan memberikan tensile and impact strength optimal.
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The joint between wearplate (wear-resistant material) and duplex stainless steel presents many challenges, such as the relief of residual stresses and the formation of brittle intermetallic compounds at the interface between the two materials. These issues are expected to be mitigated through appropriate heat treatment and welding methods. One method to determine the optimal combination of heat treatment and welding parameters is the Taguchi Method combined with the Multi-Response Performance Index (MRPI). The Taguchi Method is used to design experiments and analyze data with the objective of identifying the optimal combination of welding parameters, while MRPI is a weighting method used to combine multiple responses into a single performance index. In this study, SMAW welding was performed between wearplate material and AISI 318LN. The investigated parameters included Post Weld Heat Treatment (PWHT) holding time of 1, 10, and 20 hours; PWHT temperatures of 400 °C, 500 °C, and 600 °C; preheat temperatures of 100 °C, 150 °C, and 200 °C; and welding currents of 60 A, 90 A, and 120 A. The electrodes used were E2209 and E8018-B2. The experiment was designed using an L18 (2¹3⁴) orthogonal array with two replications. The experimental results showed that the largest percentage contribution was from PWHT temperature at 44%, followed by electrode type at 14% and preheat temperature at 12%. The welding current and PWHT holding time were not optimized because they contributed less than 5% and had p-values greater than 0.05. The optimal level combination consisted of the E2209 electrode, a preheat temperature of 150 °C, and a PWHT temperature of 400 °C. This combination produced an MRPI value of 0.83, with a predicted range of 0.652–0.865. Therefore, the Taguchi method was considered acceptable and capable of accurately representing the process behavior, as the confirmation results fell within the predicted acceptance range at a 95% confidence level. The hardness distribution and microstructural characteristics of the E2209–AISI 318LN–wearplate welded joint indicate that differences in metallurgical response are influenced by the weld metal and the welding process. The combination of E2209 electrode , 150 °C preheat and a 400°C PWHT produced a stable microstructure that optimizing tensile and impact strength

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	welding, dissimilar,tensile,impact,taguchi methods
Subjects:	T Technology > TS Manufactures > TS227 Welding.
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21101-(S2) Master Thesis
Depositing User:	Marga Yogatama
Date Deposited:	02 Feb 2026 08:51
Last Modified:	02 Feb 2026 08:51
URI:	http://repository.its.ac.id/id/eprint/131713

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