Analisa Pengaruh Hardfacing Metode Overlay Welding Terhadap Stress Release Guna Memprediksi Batas Retak Pada Grinding Tyre Pulvurizer Coal Mill Base SCW450.

Asadeni, Rifky Putra (2025) Analisa Pengaruh Hardfacing Metode Overlay Welding Terhadap Stress Release Guna Memprediksi Batas Retak Pada Grinding Tyre Pulvurizer Coal Mill Base SCW450. Project Report. [s.n.]. (Unpublished)

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Abstract

Laporan Magang Industri ini membahas analisa pengaruh proses hardfacing menggunakan metode Overlay Welding terhadap stress release guna memprediksi batas retak pada Grinding Tyre Pulverizer Coal Mill berbahan dasar baja tuang SCW450 di PT PLN (Persero) PUSHARLIS UP2W VI Surabaya. Grinding Tyre merupakan komponen kritis pada PLTU yang mengalami beban kerja dan keausan ekstrem akibat abrasi batubara. Proses perbaikan (hardfacing) dilakukan menggunakan kawat las inti fluks (flux-cored wire) jenis WearCore XD 62-O. Berdasarkan perhitungan dari parameter pengelasan yang digunakan, didapatkan nilai heat input sebesar 1,02 kJ/mm yang menimbulkan tegangan sisa (residual stress) awal sebesar 960 MPa. Melalui mekanisme pelepasan tegangan mandiri yang ditandai dengan terbentuknya sekitar 352 retakan halus (check-cracking), terjadi pelepasan tegangan (stress release) sebesar 672 MPa. Hal ini menyisakan tegangan sisa akhir sebesar 288 MPa pada material. Hasil analisa menyimpulkan bahwa retakan yang dihasilkan pasca pengelasan tergolong wajar dan aman karena berfungsi secara efektif sebagai media pelepasan tegangan, serta tidak mengganggu kualitas maupun fungsi dari hasil proses hardfacing tersebut.
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This Industrial Internship Report discusses the analysis of the effect of the hardfacing process using the Overlay Welding method on stress release to predict crack limits on a Grinding Tyre Pulverizer Coal Mill made of SCW450 cast steel base metal at PT PLN (Persero) PUSHARLIS UP2W VI Surabaya. The Grinding Tyre is a critical component in coal-fired power plants that experiences heavy workloads and extreme wear due to coal abrasion. The repair (hardfacing) process was conducted using WearCore XD 62-O flux-cored welding wire. Based on calculations from the applied welding parameters, the heat input was determined to be 1.02 kJ/mm, generating an initial residual stress of 960 MPa. Through a self-stress release mechanism characterized by the formation of approximately 352 fine cracks (check-cracking), 672 MPa of stress was released. This leaves a final residual stress of 288 MPa on the material. The analysis concludes that the cracks formed after the welding process are considered normal and safe as they effectively act as a stress relief medium, and they do not compromise the quality or functionality of the hardfacing result.

Item Type:	Monograph (Project Report)
Uncontrolled Keywords:	welding, crack, hardfacing, coal mill
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA417.3 Magnetic testing. T Technology > TA Engineering (General). Civil engineering (General) > TA418.16 Materials--Testing. T Technology > TA Engineering (General). Civil engineering (General) > TA418.38 Materials--Fatigue.
Divisions:	Faculty of Vocational > Mechanical Industrial Engineering (D4)
Depositing User:	Rifky Putra Asadeni
Date Deposited:	31 Jul 2026 02:36
Last Modified:	31 Jul 2026 02:36
URI:	http://repository.its.ac.id/id/eprint/137255

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