JobsMercury Marine

Heat Treat Lab Technician

Mercury Marine · Fond du Lac, WI

Posted Sep 14, 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 found a defect or inconsistency in a lab result that turned out to matter for production.

attention to detail and whether they follow through on catching problems rather than letting them slide

Describe a situation where you had to push back on a supervisor or engineer because your data didn't support what they wanted to hear.

integrity under pressure and comfort standing by lab results

Tell me about a time you wrote or updated a work instruction so someone else could follow a procedure correctly.

whether they can produce clear, standardized documentation others can actually use

You've got a student co-op working alongside you in the lab. How would you train them on something like sample prep or hardness testing?

ability to teach and mentor, since the role includes co-op training and project support

Technical

Walk me through how you would prepare a metallographic sample for microstructural review, start to finish.

whether the candidate actually knows the mechanics of sample prep (mounting, grinding, polishing, etching) rather than just naming the steps

What hardness testing methods have you used, and how do you decide which one fits a given part or spec?

hands-on familiarity with equipment like Rockwell or microhardness testers and judgment about applying the right test

What's your experience analyzing steel shot for process control, and what would make you flag a batch as out of spec?

direct familiarity with shot peening quality control, a fairly specific skill this job names

How do you keep a calibration schedule on track for lab gages and instruments, and what happens if something is overdue?

discipline around compliance and documentation habits, not just technical skill

What safety precautions do you take when working near the furnaces or handling hazardous materials in the lab?

real working knowledge of hazard handling versus generic safety talk

How comfortable are you designing a small lab experiment to test a possible improvement to a heat treat process, and can you give an example?

initiative and basic experimental design skills beyond routine testing

Situational

Say you're reviewing a heat treat thermal process chart and you spot a temperature dip that shouldn't be there. What do you do next?

whether they know the escalation path and can distinguish a real process deviation from a sensor glitch

How would you explain a microstructure finding to a shop floor operator who isn't a metallurgist?

ability to translate technical results into practical guidance for people running the furnaces

If the Heat Treat Metallurgical Engineer is out and shop floor operators need a call on whether a batch of parts is good to move forward, how do you handle that?

readiness to take ownership of the lab and make sound judgment calls without a safety net

Tell me about a time you had to balance a special one-off part request against the regular production sampling workload.

prioritization skills when non-production projects compete with daily lab demands

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.  Location:  Fond du Lac, WI Workplace Category: Onsite Travel Required:   No Direct Reports:   No Pay Range:    $54,300 - $75,400 Hours: Monday - Friday: 6AM - 2PM OR 7AM - 3PM 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:   No 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 conduct analytical procedures in metallurgy with instrumentation required for the control of Heat Treatment and metal finishing process operations and resultant product quality, under the supervision of the Heat Treat Metallurgical Engineer. At Brunswick, we have passion for our work and a distinct ability to deliver.     Essential Functions: • Prepares metallographic samples for testing to specifications. • Performs hardness tests on parts and samples. • Performs microstructural review of heat treat samples. • Performs analysis of steel shot for process control. • Reviews heat treat thermal process charts to confirm temperature requirements are met. • Support, work with, and communicate with Heat Treat Dept. shop floor operators to make sure parts are properly processed. • Support Heat Treat Dept. supervision to maintain production priority needs. • Prepares written Heat Treat Lab instructions to standardize procedures. • Follows special non-production related parts and heat treat processes to completion and ensures the requirements are met. • Maintains written records of data from laboratory tests and of operating data from plant processes. • Designs and performs laboratory experiments for the modification or improvement of plant 4 heat treat processes. • Maintains the laboratory and its equipment, and verifies the gages meet calibration requirements. • Verifies metal chemistry of materials for control of Heat Treatment. • Assist with Training and Project Management of Student Co-ops working in the Heat Treat Metallurgical Lab. • Has responsibility for the Heat Treat Lab when Heat Treat Metallurgical Engineer is out of office. 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: • High School diploma or GED required Preferred Qualifications: • Associate’s Degree desirable. • College level course work in chemistry, metallurgy physics, mathematics.  • Two to five years working experience in a laboratory preferably related to manufacturing operations including metal finishing. • General knowledge of Statistics • General knowledge of Engineering Principles • General knowledge of Failure Analysis • Working knowledge of analytical metallurgical lab techniques • Working knowledge of Instrumental analysis of metals and materials • Working knowledge of Mathematical calculations and data handling methods. • Working knowledge of Process equipment functions and operation. • Working knowledge of Safety & handling of hazardous materials. • Computer experience with Microsoft Word, Excel, and Powerpoint. Working Conditions: The Heat Treat Lab Technician will work in the climate-controlled Heat Treat Laboratory at a dedicated workstation regularly interfacing with test equipment and computers.  The technician will regularly go into the Heat Treat shop to obtain samples and communicate with operators for production sampling, including working near high temperature furnaces. The hiring range for this position is $54,300 - $75,400 annually. The actual base pay offered will vary based on multiple factors including 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.  In addition to base pay, this position is eligible for an annual discretionary bonus.  This position is eligible to participate in Brunswick's comprehensive and high-quality benefits offerings, including medical, dental, vision, paid vacation, 401k (up to 4% match), Health Savings Account (with company contribution), well-being program, product purchase discounts and much more. Details about our benefits can be found  here . 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: Headquartered in Fond du Lac, Wisconsin, Mercury Marine® is the world’s leading manufacturer of recreational marine propulsion engines. A division of Brunswick Corporation (NYSE: BC), Mercury provides engines, boats, services and parts for recreational, commercial and government marine applications. Mercury empowers boaters with products that are easy to use, extremely reliable and backed by the most dedicated customer support in the world. The company’s industry-leading brand portfolio includes Mercury outboard engines, Mercury MerCruiser® sterndrive and inboard packages, Mercury propellers, Mercury inflatable boats, Mercury SmartCraft® electronics, Land 'N' Sea 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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