JobsMercury Marine

Mercury Marine - Heat Treat Metallurgical Engineer Co-op

Mercury Marine · Fond du Lac, WI

Posted Aug 24, 2026 · We last checked this listing on Sep 20, 2026

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Likely interview questions for this role

Written from this job description, not a generic list. Each one notes what the interviewer is really checking.

Behavioral

Tell me about a time you had to learn a piece of lab equipment or software you'd never touched before. How did you go about it?

self-directed learning ability, since the co-op will be trained on unfamiliar instrumentation quickly

Tell me about a time you had to explain a technical result to someone who wasn't an engineer, maybe a technician or a production worker.

ability to communicate across the plant floor with people at different technical levels, which the posting explicitly calls out

Describe a school or internship project where you had to collect and analyze data and then make a recommendation based on it.

whether they can close the loop from raw data to an actionable conclusion, not just run tests

Tell me about a time a project or experiment didn't go the way you planned. What did you do differently the second time around?

resilience and willingness to iterate, useful signal for someone managing projects from inception to completion

Why metallurgy, and why does this kind of manufacturing environment interest you over a pure research lab?

genuine motivation and fit for a production-floor role versus an academic research mindset

Technical

Walk me through what heat treatment does to the microstructure of a carbon steel versus an aluminum alloy.

whether the candidate has real coursework or lab grounding in metallurgy fundamentals, not just familiarity with the term

How does X-ray diffraction work, and what would you actually be looking for when you run a sample through a diffractometer here?

depth of understanding of the specific instrument named in the posting versus surface-level exposure

What is the difference between quenching and tempering, and why would a manufacturer choose one heat treat process over another for a given part?

whether foundational classroom knowledge on heat treat processes is solid enough to apply on the job

What safety considerations come to mind when you think about working around heat treat equipment and a metallurgical lab on a plant floor?

basic safety awareness for an onsite manufacturing environment, since this is hands-on lab and floor work

Situational

If a micro-hardness test comes back outside the expected range on a batch of stainless steel parts, what would you do first?

structured troubleshooting instinct and whether they'd jump to conclusions or verify the data first

Say you're testing a rush batch of aluminum parts and the results look inconsistent with what the process sheet predicts. Who do you go to and what do you tell them?

judgment about escalation and communication when data contradicts expectations in a production environment

How comfortable are you managing a small project on your own, from setting it up to reporting the final result, without someone checking in on you daily?

independence and ownership, since the role explicitly involves creating and managing projects with limited oversight

Practice this interview out loud.

Offer builds a real interview for this exact role at Mercury Marine from your resume and this job description, asks the questions one at a time, and tells you what landed. The first one is free.

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The full job description

As published by Mercury Marine.

Are you ready for what’s next?   Come explore opportunities within Brunswick, a global marine leader committed to challenging conventions and innovating next-generation technologies that transform experiences on the water and beyond.  Brunswick believes “Next Never Rests™,” and we offer a variety of exciting careers and growth opportunities within united teams defining the future of marine recreation.  Mercury Marine-Fond Du Lac, WI- Mercury Marine: Experience Management Intern Location: Plant 4- Fond du Lac, WI Workplace Category: Onsite Travel Required: No Direct Reports: No Pay Range:  $18.00-27.50 Visa Sponsorship: Applicants must be currently authorized to work in the United States.  This position is not eligible for employment visa sponsorship now or in the future.   Relocation: Yes Innovation is the heart of Brunswick.  See how your contributions will help transform vision into reality: Position Overview :  As part of the talented Quality team, you will support the launch of state-of-the-art systems through metallurgical analysis. You will learn how to work with a team of managers, supervisors, technicians, and production employees in a metallurgical lab as well as on the plant floor as you create and manage projects from inception to completion. Position reports to Mercury Marine Heat Treat Metallurgical Engineer. At Brunswick, we have passion for our work and a distinct ability to deliver.  Essential Functions: • Operate X-ray diffractometer, Automated Micro-hardness tester, and other instrumentation which aid in metallurgical analysis • Perform testing on a variety of carbon steels, stainless steels, and aluminum alloys • Deliver critical material analysis and inspection results • Support Heat Treat Metallurgical Laboratory daily operations In addition to a great hands-on learning experience you will also acquire the skills needed to: • Effectively and quickly collect and analyze data coming from manufacturing processes • Make recommendations that effectively improve processes • Effectively express your ideas, influence decisions, manage projects to a positive result, and communicate with employees at all levels of an organization Diversity of thought and experiences is fundamental when imagining the unimaginable. Certain skillsets/experiences are necessary; however, others can be developed along the way. Required Qualifications: • Current enrollment in a BS program with a major in Metallurgical Engineering, Materials Science, Mechanical Engineering, or a relevant degree with materials or metallurgy emphasis • Minimum second semester sophomore status with 48 completed credits • Availability to work full-time (40 or more hours per week) through a full co-op term running January to August 2027 or May to December 2027 • The ability to enroll in a formalized co-op Program through your university • Dependable, self-motivated and engaged learner • Ability to occasionally lift up to 35 lbs.  Working Conditions: • Learning Opportunities: Our Student Program is designed to provide hands-on experience in a professional setting. You will work alongside experienced professionals and get a chance to apply your academic knowledge to real-world tasks.    • Project Work: The work environment is supportive, collaborative, and conducive to learning. Student co-ops or interns typically work on specific projects or tasks that contribute to the organization’s goals. This may range from supporting larger projects to handling smaller, individual assignments.     • Hours: Co-ops and Interns are expected to work a full 40-hour work week  • Feedback and Performance Reviews: As a co-op or intern, you will receive feedback and performance reviews throughout your assignment. We value the importance for interns to understand their progress and areas for improvement.   The pay range for this position is $18.00-27.50 per hour.  The actual hourly rate offered will vary depending on multiple factors including year in school/credits earned, degree, job-related knowledge/skills, relevant experience, business needs, and geographic location.  Compensation decisions are dependent upon the specifics of the candidate’s qualifications and the business context. Why Brunswick:   Whatever tomorrow brings, we’ll be at the leading edge.  As the clear leader in the marine industry, we’re committed to our values and supporting our exceptional people. We offer and encourage growth opportunities within and across our many brands. In addition, we’re proud of being recognized for making a splash with numerous awards !  About Mercury Marine: Mercury Marine is a world leading manufacturer of marine propulsion systems. A $2.6 billion division of Brunswick Corporation (NYSE: BC), Mercury designs, manufactures and distributes engines, services and parts for recreational, commercial and government marine applications, empowering boaters with products that are easy to use, extremely reliable and backed by the most dedicated customer support in the world with 10,000 service points globally. Mercury’s industry-leading brand portfolio includes Mercury outboard engines; Mercury MerCruiser sterndrive and inboard packages; Mercury global parts and accessories; Land ’N’ Sea, BLA, Payne’s Marine, Kellogg Marine & Lankhorst Taselaar marine parts distribution; and Mercury and Quicksilver parts and oils. More information is available at mercurymarine.com. Next is Now!   We value growth and development, recognizing that people come with a wealth of experience and talent beyond just the technical requirements of a job. If your experience is close to what you see listed here, please still consider applying. Brunswick is an Equal Opportunity Employer and considers all qualified applicants for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, protected veteran status or any other characteristic protected by federal, state, or local law.  Diversity of experience and skills combined with passion is key to innovation and inspiration and we encourage individuals from all backgrounds to apply.  If you require accommodation during the application or interview process, please contact hrsharedservices@brunswick.com  for support.  Brunswick and Workday Privacy Policies Brunswick does not accept applications, inquiries or solicitations from unapproved staffing agencies or vendors. For help, please contact our support team at: hrsharedservices@brunswick.com or 866-278-6942. All job offers will come to you via the candidate portal you create when applying through a posted position through https:///www.brunswick.com/careers .  If you are ever unsure about what is being required of you during the application process or its source, please contact HR Shared Services at 866-278-6942 or HRSharedServices@brunswick.com . #Brunswick Corporation - Mercury Marine For more information about EEO laws, - click here Brunswick Corporation participates in E-Verify as part of our commitment to a lawful and transparent hiring process. For additional information click here: https://www.brunswick.com/e-verify .

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