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All Journal Journal Industrial Servicess Trends in Mechanical Engineering Research
Yusraini Muharni
Department of Industrial Engineering, Universitas Sultan Ageng Tirtayasa
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering Transportation

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Towards zero-defect manufacturing: A proactive quality risk assessment of welding imperfections in wind tower production Yusraini Muharni; Evi Febianti; Muhammad Adha Ilhami; Ade Irman Saeful Muttaqien; Lely Herlina; Muhammad Rafi Hasyim; Anting Wulandari; Kulsum Kulsum; Hartono Hartono; Maria Ulfah
Journal Industrial Servicess Vol 12, No 1 (2026): April 2026
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/jiss.v12i1.40342

Abstract

Wind tower manufacturing demands exceptionally high-quality standards due to its critical role in renewable energy infrastructure. However, defect occurrences during the production process remain a persistent challenge that can compromise structural integrity, increase rework costs, and delay project delivery. This study aims to identify, analyse, and evaluate the risk of defects in the wind tower production process by using an integrated approach of 5 Whys and Failure Mode and Effects Analysis (FMEA). The 5 Whys methodology was employed to trace the root causes of recurring defects, while FMEA was utilized to assess failure modes based on severity, occurrence, and detectability values, resulting in a Risk Priority Number (RPN) for each identified failure. The 5 Whys analysis revealed that the root of the problem lies in the absence of a procedure for verifying work positions before welding. The improvements focused on the design the standard operating procedure, increasing operator competency, controlling process parameters, and validation through trials and inspections to support a decrease in the level of defects and improve product quality.
ENERGY-CONSCIOUS PRODUCTION SCHEDULING FOR FABRICATED METAL PRODUCTS: A MIXED-INTEGER PROGRAMMING APPROACH Bobby Kurniawan; Melina Melina; Yusraini Muharni
Trends in Mechanical Engineering Research Vol 4, No 1 (2026): JUNE
Publisher : Department of Mechanical Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/timer.v4i1.40906

Abstract

Energy is a fundamental requirement in the metal fabrication industry. However, energy consumption is rarely taken into account in production scheduling decisions. In fact, a well-designed production schedule can contribute significantly to energy conservation. Therefore, production scheduling must explicitly consider energy consumption. This study proposes an energy-conscious production scheduling system for a fabricated metal products industry. The production system under study exhibits the characteristics of a hybrid flow shop, and thus the problem is modeled as a hybrid flow shop scheduling problem. To solve this problem, the mixed-integer programming (MIP) method is employed to solve the hybrid flow shop scheduling model. The results demonstrate an energy cost saving of 0.66% compared to the scheduling practice currently in use.
Co-Authors Ade Irman Saeful Muttaqien Anting Wulandari Bobby Kurniawan Evi Febianti Hartono Hartono Kulsum Kulsum Lely Herlina Maria Ulfah Melina Melina Muhammad Adha Ilhami Muhammad Rafi Hasyim