KEY DUTIES:
Determination of product requirements by examination of blueprint(s) and specifications.
Preparation of steel specimens for metallographic inspection, including:
- Accurate abrasive saw cutting along the required planes as indicated in the blueprints, and without overheating the specimen. Requires working knowledge of manual and automatic abrasive saws, work holding devices, cooling requirements and proper cutting feeds.
- Press mounting for metallographic examination.
- Engraved identification with clear and legible numbers.
- Grinding of mounted or unmounted specimens to achieve a flat surface with shallow parallel lines ready for final polishing.
- Achieve a flat and mirror-like surface free of scratches by manual or automatic polishing of ground specimens. Avoid pull-off of non-metallic inclusions and minimize edge round-off.
- Acid etching of polished specimens to reveal all microstructural features to 500X magnifications or greater.
Examination and testing of metallographic specimens using hardness testers, case depth testers and metallographic microscopes, including:
- Working knowledge of hardness testing with manual and automatic testers, and using the Rockwell C, Rockwell B and Vickers scales. Understanding of the relationship and conversions among scales.
- Working knowledge of case depth testers, including their general operation and their use to verify requirements in automotive driveline steel parts.
- Ability to recognize phases and features found in welded and heat-treated carbon and low alloy steels, including grain size and phases in a specimen.
- Working knowledge of induction heat treatment, carburizing, friction welding and arc welding processes to allow evaluation of carbon and low alloy steel specimens by testing and comparing with requirements, including determination of microstructural characteristics, cracking, grain size, non-metallic inclusions, surface bainite, surface decarburization and retained austenite.
Prepare clear and legible quality reports with test results and disposition.
Understanding of the safety risks associated with all Met Lab equipment and materials, perform all duties and responsibilities in a safe manner.
Help maintain and establish 5S guidelines, including participation on housekeeping chores and basic equipment care, including changing and mounting abrasive saw blades and belts, discharging and cleaning of saw cooling tanks, helping keep all areas clean and orderly and help identify and store all retained specimens for future retrieval and examination.
REQUIREMENTS :- Basic knowledge of carbon and low alloy steels and their properties.
- Working knowledge of materials testing equipment safety and procedures, including abrasive saws, work holding devices, wheel grinders and polishers, acid etching methods and procedures, hardness testers, case depth testers and metallographic microscopes.
- Working knowledge of blueprint reading and metrology, including use of Vernier calipers and understanding of metric system.
- Working knowledge of acids, their safety risks and manipulation techniques.
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