Dewi, Safa Mahar (2022) Peningkatan Kualitas Menggunakan Six Sigma, Affinity Diagram Dan Visualisasi Qvsm Untuk Meminimasi Defect Pada Proses Pengelasan Peralatan Tambang Rock Bolt (Studi Kasus: PT. Refindo Intiselaras). Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
PT Refindo Intiselaras adalah salah satu perusahaan manufaktur peralatan tambang yang telah dipercaya beberapa perusahaan tambang besar. Kepercayaan pelanggan ini membuat PT. Refindo Intiselaras harus menjaga kualitas dari produknya. Namun, PT. Refindo Intiselaras hingga saat ini masih menerima komplain pelanggan dan juga memiliki grafik nilai sigma day to day dengan trendline yang semakin menurun. Apabila tidak dilakukan perbaikan maka dapat membuat kualitas produk yang dihasilkan oleh perusahaan menurun pula. Oleh sebab itu, dilakukan penelitian yang bertujuan untuk menggali akar permasalahan dan membuat beberapa alternative rekomendasi perbaikan yang dapat dilakukan perusahaan serta meningkatkan performansi dari produksi PT. Refindo Intiselaras dengan metode peningkatan kualitas Six Sigma. Berdasarkan observasi yang telah dilakukan di PT. Refindo Intiselaras khususnya pada proses produksi rock bolt terdapat 4 jenis defect atau cacat produk yang dapat mempengaruhi kualitas dan fungsi produk ini sehingga menimbulkan adanya komplain dari pelanggan. Adanya cacat produk pada proses produksi membuat PT. Refindo Intiselaras memiliki nilai sigma sigma level) sebesar 3,19. Terjadinya cacat produk ketika proses produksi berlangsung disebabkan oleh berbagai faktor. Dengan melakukan analisis akar permasalahan menggunakan tools affinity diagram dan fishbone diagram didapatkan beberapa faktor penyebab terjadinya cacat dari berbagai perspektif seperti SDM, mesin, metode, material dan lingkungan. Untuk memberikan rekomendasi upaya perbaikan untuk meminimasi produk cacat pada proses produksi rock bolt di PT. Refindo Intiselaras pada penelitian ini menggunakan analisis resiko terlebih dahulu untuk menentukan penyebab permasalahan kritisnya. Didapatkan bahwa permasalahan kritis saat ini adalah kurangnya support jig welding yang membuat benda gerak/produk bergerak saat dialkukan pengelasan sehingga pengelasan tidak sempurna. Selain itu ada pula permasalahan kurangnya pengawasan karena tidak adanya inspektor pada shift 2 kerja. Dari permasalahan tersebut didapatkan rekomendasi terpilih adalah membuat jig support untuk menahan benda gerak, pembuatan WPS (Welding Procedure Specification), dan juga melakukan penambahan inspektor pada shift 2 kerja.
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PT Refindo Intiselaras is one of the mining equipment manufacturing companies that has been trusted by several large mining companies. This customer trust makes PT. Refindo Intiselaras must maintain the quality of its products. However, PT. Refindo Intiselaras is still receiving customer complaints and also has a chart of sigma values day to day with a declining trendline. If improvements are not made, the quality of the products produced by the company will decrease as well. Therefore, a research was conducted that aims to explore the root of the problem and make several alternative recommendations for improvement that the company can do and improve the performance of the production of PT. Refindo Intiselaras with the Six Sigma quality improvement method. Based on the observations that have been made at PT. Refindo Intiselaras especially in the rock bolt production process, there are 4 types of defects or product defects that can affect the quality and function of this product, causing complaints from customers. The existence of product defects in the production process makes PT. Refindo Intiselaras has a sigma (sigma level) value of 3.19. The occurrence of product defects during the production process is caused by various factors. By analyzing the root of the problem using affinity diagrams and fishbone diagrams, it was found several factors causing defects from various perspectives such as human resources, machines, methods, materials and the environment. To provide recommendations for improvement efforts to minimize defective products in the rock bolt production process at PT. Refindo Intiselaras in this study uses risk analysis first to determine the cause of the critical problem. It was found that the critical problem at this time is the lack of jig welding support which makes the moving object/product move when welding is carried out so that the welding is not perfect. In addition, there is also the problem of lack of supervision due to the absence of inspectors on shift 2 work. From these problems, it was found that the selected recommendations were making jig support to hold moving objects, making WPS (Welding Procedure Specification), and also adding inspectors on shift 2 work.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Six Sigma, Peningkatan Kualitas, Affinity Diagram, Value Stream Mapping, Welding, Quality Improvement, Affinity Diagram, Value Stream Mapping, Welding |
| Subjects: | H Social Sciences > HD Industries. Land use. Labor > HD9980.5 Service industries--Quality control. |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Industrial Engineering > 26201-(S1) Undergraduate Thesis |
| Depositing User: | Mr. Marsudiyana - |
| Date Deposited: | 09 Feb 2026 05:50 |
| Last Modified: | 09 Feb 2026 05:50 |
| URI: | http://repository.its.ac.id/id/eprint/132290 |
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