When we think of modern non-destructive testing (NDT), electromagnetic testing might not be the first thing that comes to mind. Yet, the technology’s deep roots stretch back to the early days of industrial development, transforming industries over the last century. One company, Magnetic Analysis Corporation (MAC), stands out as a pioneer in this field. Their journey is filled with innovation, from early experiments in magnetic flaw detection to the sophisticated eddy current and flux leakage systems we see today.
From Flawed Rails to Electromagnetic Breakthroughs
The story of electromagnetic testing begins in an unexpected place—on the railroads of the early 20th century. Rail inspections at the time relied on visual methods, but after a deadly train derailment in 1911, it became clear that internal flaws in the rails needed a new solution. Enter Dr. Charles Burrows, a physicist from the U.S. Bureau of Standards, who was instrumental in developing magnetic methods to detect hidden flaws in steel. Burrows’ early work laid the foundation for what would become electromagnetic testing.
MAC, founded in 1928 by William S. Gould and his son, acquired key patents from Burrows’ company, Burrows Magnetic Equipment Corporation. These patents became the backbone of MAC’s early products. However, early testing equipment struggled to provide reliable results in industrial settings. It wasn’t until 1934, when MAC introduced the first successful electromagnetic tester for steel bars, that the field of electromagnetic testing truly took off.
Pioneering Innovations in NDT
MAC’s contributions didn’t stop there. They introduced several groundbreaking NDT tools, including the world’s first spinning probe eddy current tester, revolutionizing the way industries detect long continuous defects in materials like wire and bar. The company’s relentless pursuit of innovation helped move electromagnetic testing beyond steel, allowing it to inspect non-magnetic metals such as aluminum, copper, and stainless steel.
In fact, MAC’s work in eddy current technology led to critical developments in the aerospace, automotive, and energy industries. Their testing equipment became essential in ensuring the integrity of everything from aircraft components to fuel pipelines.
MAC Today: 95 Years of Innovation and Leadership
In 2023, MAC celebrated its 95th anniversary, a milestone that highlights its enduring commitment to technological advancement and customer service. Operating on a global scale, MAC helps metal manufacturers worldwide meet demanding specifications with cutting-edge systems for eddy current, ultrasonic, phased array ultrasonic, and flux leakage testing. With headquarters in Elmsford, NY, and manufacturing facilities in Ohio and Sweden, MAC continues to be a leader in the NDT space.
The company is not just reflecting on its past success but is also looking toward the future. As
outgoing CEO, stated during the anniversary celebration, the demands on the metals industry are becoming more complex, and MAC is dedicated to staying one step ahead.
A New Chapter Begins
In November 2023, Daniel Lawrence was appointed as MAC’s new President and CEO ushered in a new chapter for the company. Lawrence brings a wealth of experience in industrial manufacturing and aims to build on MAC’s solid foundations. As MAC emerges stronger post-pandemic, it is poised for further growth, supported by one of the largest order books in its history.
A Legacy of Safety and Innovation
The history of electromagnetic testing is one of persistence, innovation, and a commitment to safety. MAC’s journey from humble beginnings to global leader in NDT showcases how a combination of visionary leadership and scientific breakthroughs can reshape entire industries
as the company embraces new leadership and continues to develop state-of-the-art testing solutions, its legacy of pushing boundaries remains as strong as ever.
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