Geumhak An

Aug 2023 – Sep 2025 Deputy General Manager / Team Leader, Heavy Industry Division Seojin System Vietnam • Established a local manufacturing base in Vietnam as a welding partner for Hyosung Heavy Industries and LS Electric, specializing in aluminum welded conductors and enclosures. • Led the training and development of local aluminum welders by designing and operating hands-on education and practical training programs. • Developed WPS and conducted PQR testing optimized for aluminum conductors and enclosures. • Ensured rigorous product quality through in-house PT inspections and comprehensive NDT processes. • Designed and developed product-specific welding jigs and optimized production processes to improve productivity and workflow efficiency. • Created auxiliary welding tools and support devices to enhance operator convenience and ensure consistent weld quality. • Collaborated with cross-functional teams to successfully complete diverse engineering and manufacturing projects. • Performed welding and repair work for JIS SKD61 (AISI H13 / DIN 1.2344) hot-work tool steel and AL6000-series aluminum casting blank molds. • Provided Chinese–Korean on-site interpretation and technical support for Chinese clients visiting the Vietnam facility, improving communication and customer satisfaction.

Deputy Manager, Fabrication Team Korea Buffing Co., Nov 2021 – Aug 2023 (1 year 10 months) • Performed TIG welding and fabrication for industrial equipment used in food processing, pharmaceutical manufacturing, and heat-exchange systems. • Specialized in stainless-steel sanitary piping, pressure vessels, tanks, frames, and various custom industrial components. • Executed high-precision TIG welding in clean and regulated environments, adhering to industry standards and customer specifications. • Supported fabrication workflow improvements and contributed to process stability, weld quality consistency, and production efficiency. • Conducted on-site fitting, troubleshooting, and quality checks to ensure reliable assembly and installation of fabricated units.

Welding Technician / Team Lead I began my career in the Aluminum Welding & Fabrication Department at Impact Fluid Systems, a subsidiary of A-One Engineering Korea. When the company was acquired by Celestica Inc. in October 2018, I had the opportunity to expand my experience within a global manufacturing environment and collaborate with major semiconductor equipment companies such as Applied Materials and Lam Research. During this period, I specialized in manual TIG welding of aluminum equipment parts, precision components, and vacuum piping units used in semiconductor tools. Key Responsibilities & Achievements • Led the development of WPS and performed PQR testing for AL6000-series aluminum TIG welding, establishing reliable production standards that met the strict requirements of global semiconductor customers. • Designed and built custom welding jigs for aluminum vacuum piping in semiconductor CVD equipment. • Developed post-weld correction and distortion-control processes, significantly improving production stability, repeatability, and overall quality. • Performed high-precision manual TIG welding on stainless-steel (316 series) bellows, sanitary piping, and vacuum/intermediate line units for semiconductor manufacturing equipment. • Strengthened expertise in high-cleanliness, high-precision fabrication environments, ensuring compliance with semiconductor industry quality specifications. Professional Mindset I believe that “technology is perfected in the field.” With this philosophy, I continually focus on process improvement, defect prevention, and solving real on-site challenges. My goal is to deliver welding solutions that meet global-tier quality standards and to continue growing as a trusted welding expert in the semiconductor manufacturing industry.

Welding Technician Semiconductor Equipment Manufacturing — Clients: Samsung Electronics, SK Hynix • Executed manufacturing and welding of semiconductor equipment piping line units within a 100-class cleanroom environment for global semiconductor equipment manufacturers including Applied Materials. • Performed orbital welding of sanitary and Hastelloy tubes and fittings for gas lines using Orbitalum 165CA automatic tube welding system. • Handled manual TIG welding on various sanitary piping components, tube units, and fittings within utility lines using Miller Dynasty 210 and Miller Maxstar 350 TIG welders. • Maintained strict compliance with cleanroom protocols and semiconductor industry quality standards throughout all welding operations. • Transitioned due to corporate strategic relocation of investment to Malaysia by the US headquarters. Qualifications and Certifications Orbital Auto Welding related qualification (obtained from Comparta Systems) ASME SEC.IX/GTAW (Orbital Auto Welding) 1/4” -5G ASME SEC.IX/GTAW (Orbital Auto Welding) 3/8” -5G ASME SEC.IX/GTAW (Orbital Auto Welding) 1/2” -5G

Wartsila Corporation – Global Leader in Marine Engines & Power Generation • Performed repair welding on Two Stroke SULZER Engines and Four Stroke Main Generators by removing stress cracks using arc air gouging and ARC welding with high-carbon ER7016 electrodes. • Executed welding operations in strict compliance with international classification societies’ Welding Procedure Specifications (WPS) and Radiographic Testing (RT) standards. • Maintained an RT inspection pass rate above 97%, ensuring high-quality welds on critical components. • Certified in five welding qualifications by DNV (Norway), GL (Germany), and ABS (USA), skilled in advanced positions including 6GR pipe welding. Key Responsibilities: • Repair and removal of stress cracks on marine engine and generator parts. • ARC and TIG welding on high-carbon steels and stainless steel components. • Managed welding repairs following international WPS guidelines with successful RT inspections. • Performed field welding at shipyards, power plants, and port facilities domestically and internationally. • Holder of international classification society welder ID, authorized for high-difficulty welding tasks. • Delivered precise welding and defect repairs meeting stringent global quality standards. International Welding Certifications: • SMAW Arc Welding (4G, 30mm & 16mm, RT/VT) – DNV GL, April 2009 • GTAW TIG Welding (3G, 16mm, RT/VT) – ABS, May 2010 • GTAW/FCAW Pipe Welding (6GR, 65mm, RT/VT) – ABS, June 2010 • GTAW/SMAW Welding (1G & 4G, 16mm & 30mm, UT/MT/RT/VT) – DNV GL, June 2010 • GMAW/FCAW Welding (4G, 30mm & 16mm, UT/MT) – DNV GL, March 2011

Welding Technician / Field Specialist Kitco Filter (USA) – Korean Branch Partner • Responsible for fabrication and onsite installation of filtration equipment and piping systems for apartment fire safety and sewage water treatment plants, ensuring compliance with local building codes. • Executed specialized welding works including Argon TIG, ARC, and oxygen welding on non-ferrous metals. • Handled installation and welding of piping systems consisting of: • Stainless Steel (SUS) pipes ranging from 15A to 250A • Copper pipes ranging from 16A to 125A • Collaborated closely with project teams to ensure quality and timely completion of equipment manufacturing and field construction works.

As a container repair and welding technician at Brigantine Services (Shenzhen), a subsidiary of the A.P. Moller–Maersk Group, I specialized in the structural restoration and welding of both dry and refrigerated containers. Working in fast-paced port operations, I developed strong competencies in fault diagnostics, functional recovery, and quality-driven welding practices. This experience provided a solid technical foundation for reliability-focused maintenance across global port environments.

Beijing PALL FILTER Co., Ltd (Asia Manufacturing Center of PALL Corporation, USA) • Performed high-quality welding on high-purity filtration equipment and purification solution systems for oil, chemical, life sciences, pharmaceutical, and semiconductor industries. • Executed complex welding operations under strict compliance with ASME safety standards, including 100% Radiographic Testing (RT) inspections as required by corporate policy. • Gained practical expertise in RT welding techniques for pressure vessels and sanitary equipment, ensuring international quality and safety standards were consistently met. Key Responsibilities: • Tanks and Pressure Vessels: • Welded components ranging Ø219mm to Ø800mm in Carbon Steel and Stainless Steel (SUS) using ARC and TIG welding methods. • Conducted 100% RT inspections on all joints to verify weld integrity and regulatory compliance. • Pharmaceutical and Semiconductor Sanitary Equipment: • Performed manual TIG welding on filtration devices, housings, and sanitary piping ranging Ø15mm to Ø65mm diameter. • Ensured 100% RT inspection compliance on all welds, maintaining strict sanitary and quality requirements. • Earned official Pressure Vessel RT Welding Technician certification from China Boiler and Pressure Vessel Safety Supervision Bureau (Ministry of Labor). • Contributed to manufacturing processes that demand rigorous quality standards, supporting reliable production of filtration and pressure vessel equipment applicable across multiple high-tech industries.

Shipbuilding and Block Fabrication Site • Performed ARC welding and CO₂ welding on ship and block structures. • Conducted gouging operations for defect removal and repair welding. • Experienced in oxygen cutting and welding of heavy structural components. • Skilled in handling diverse welding tasks for large-scale shipbuilding projects.