Perbaikan kualitas produk steel tub girder ramp 2 junction tebing tinggi pada proses welding dengan Metode Six Sigma di PT. Bakrie Metal Industries

DETAIL KOLEKSI

Perbaikan kualitas produk steel tub girder ramp 2 junction tebing tinggi pada proses welding dengan Metode Six Sigma di PT. Bakrie Metal Industries

Oleh : Sita Aisha Gemala

Info Katalog

Penerbit : FTI - Usakti

Kota Terbit : Jakarta

Tahun Terbit : 2021

Pembimbing 1 : Rina Fitriana

Pembimbing 2 : Debbie Kemala Sari

Subyek : Steel - Quality control;Six sigma (Quality control standard)

Kata Kunci : ctq (critical to quality), dmaic (define-measure-analyze-improve-control), six sigma, fmea (failure

Status Posting : Published

Status : Lengkap

File Repositori

No.	Nama File	Hal.
1.	2021_TA_STI_063001700086_Halaman-Judul.pdf	17
2.	2021_TA_STI_063001700086_Lembar-Pengesahan.pdf	4
3.	2021_TA_STI_063001700086_Bab-1_Pendahuluan.pdf	6
4.	2021_TA_STI_063001700086_Bab-2_Tinjauan-Pustaka.pdf
5.	2021_TA_STI_063001700086_Bab-3_Metodologi-Penelitian.pdf
6.	2021_TA_STI_063001700086_Bab-4_Analisis-Hasil-dan-Pembahasan.pdf
7.	2021_TA_STI_063001700086_Bab-5_Kesimpulan-dan-Saran.pdf
8.	2021_TA_STI_063001700086_Daftar-Pustaka.pdf	1
9.	2021_TA_STI_063001700086_Lampiran.pdf

Abstrak
Abstract

P PT. Bakrie Metal Industries merupakan perusahaan yang berfokus pada bidang manufacturing corrugated metal product dan fabrication project. Salah satu produk yang dihasilkan adalah produk steel tub girder ramp 2. Berdasarkan data perusahaan, rejection rate atau presentase cacat produk tertinggi pada bulan Juli 2020 sebesar 7,214%. Batas toleransi perusahaan untuk rejection rate sebesar 4%. Tujuan penelitian yang dilakukan adalah meningkatkan kualitas produk dengan meminimasi kecacatan produk, meningkatkan tingkat sigma, dan mengevaluasi faktor penyebab kecacatan produk berdasarkan metode six sigma melalui tahapan DMAIC. Tahap define terdapat diagram SIPOC produksi dan jenis cacat pada CTQ adalah slag inclusion, porosity, dan incomplete penetration. Tahap measure menggunakan perhitungan peta kendali p, peta kendali c, DPMO, dan tingkat sigma. Tingkat sigma memperoleh nilai sebesar 3,33 sigma sebelum perbaikan. Tahap analyze berisikan analisis sebab dan akibat cacat produk menggunakan metode diagram pareto, metode fishbone diagram, metode Failure Mode and Effect Analysis (FMEA), dan metode Fault Tree Analysis (FTA). Penyebab kegagalan tertinggi adalah slag inclusion sebesar 52,9% dan porosity sebesar 28,2%. Berdasarkan nilai RPN dan nilai probabilitas tertinggi, efek penyebab potensial proses interpasss cleaning pada lasan tidak sempurna dengan nilai RPN sebesar 486 dan nilai probabilitas top event sebesar 0,71, efek penyebab potensial welder melakukan kelalaian saat proses pengelasan dengan nilai RPN sebesar 432 dan nilai probabilitas top event sebesar 0,55, dan efek potensial penyebab potensial terdapat zat pengotor pada lasan sebesar 384 dan nilai probabilitas top event sebesar 0,48 . Tahap improve memberikan usulan perbaikan berupa menggunakan mesin gerinda dan pembuatan checksheet beserta instruksi kerja pengisian checksheet saat proses interpass cleaning, pembuatan SOP proses pengelasan, dan checksheet serta instruksi pengisian checksheet inspeksi material. Tahap control tidak dapat dilakukan implementasi usulan perbaikan dikarenakan adanya covid-19.

P PT. Bakrie Metal Industries is a company that focuses on manufacturing corrugated metal products and fabrication projects. One of the products produced is the steel tub girder ramp 2. Based on company data, the highest rejection rate or percentage of product defects in July 2020 was 7.214%. The companyâ€™s tolerance limit for the rejection rate is 4%. The purpose of this research is to improve product quality by minimizing product defects, increasing the level of sigma, and evaluating the factors causing product based in the six sigma method through the DMAIC stage. There is a production SIPOC diagram the the define stagem and the types of the defects in CTQ are slag inclusion, porosity, and incomplete penetration. The measuring stage uses the calculation of the p control chart, c control chart, DPMO, and sigma level. The sigma level obtained a value of 3.33 sigma before repair. The analysis stage containds an analysis of the causes and effects of product defects using the pareto diagram method, the fishbone diagram method, the Failure Mode and Effect Analysis (FMEA) method, and the Fault Tree Analysis (FTA) method. The cause of the highest failure is slag inclusion of 52.9% and porosity of 28.2%. Based on the RPN value and the highest probability value, the effect of the potential cause of the interpass cleaning process on imperfect welds with an RPN value of 486 and top event probability value of 0.71, the effect of potential cause of a welder doing negligence during the welding process with an RPN value of 432 and a probability value the top event is 0.55, and the effect of potential cause of there are impurities in the weld with and RPN value of 384 and top event probability is 0.48. The improvement stage provides suggestions for improvements in the form of using a grinding machine and making checksheets with instruction during the interpass cleaning process, making SOPs for the welding process, and material inspection checksheets with instruction.Control stage cannot be implement because the outrage of covid-19.