Donald H Campbell

Title: The Innovations of Donald H. Campbell

Introduction

Donald H. Campbell is a notable inventor based in Niagara-on-the-Lake, Canada. He holds a total of seven patents, showcasing his contributions to the field of materials science and engineering. His work primarily focuses on enhancing the properties of ferrophosphorus particles and their applications in welding processes.

Latest Patents

One of Campbell's latest patents involves the treatment of ferrophosphorus particles with hypophosphorous acid. This innovative process increases the conductivity of the ground ferrophosphorus particles by contacting them with an aqueous solution of hypophosphorous acid, preferably at temperatures between room temperature and about 50 degrees Celsius. After treatment, the particles are washed and dried, making them suitable for mixing with resinous binders to formulate coating compositions. These compositions are particularly beneficial for coating galvanized steel intended for welding.

Another significant patent addresses resistance welding of galvanized steel. This invention features a coating that improves the resistance welding of galvanized steel parts or sheets. The coating comprises a binder and a metal phosphide pigment, preferably a ferrophosphorus pigment, with a particle size ranging from about 0.1 to about 30 microns. The pigment may also include up to about 40% by weight of an additional metal such as tin, aluminum, or lead. This coating can be applied to either the faying or non-faying surfaces of the galvanized steel, or to the resistance welding electrode, and can be removed after the welding operation if desired. The advantages of this invention include a significant reduction in welding current, an increase in the weldability lobe width, restoration of the dynamic resistance beta peak, and an increase in electrode life.

Career Highlights

Throughout his career, Donald H. Campbell has worked with prominent companies such as Occidental Chemical Corporation and Hooker Chemicals & Plastics Corporation. His experience in these organizations has contributed to his expertise in the field and has facilitated his innovative endeavors.

Collaborations

Campbell has collaborated with notable individuals in his field, including Gerald L. Evarts and Michael J. Fifolt. These collaborations have likely enriched his work and led to further advancements in his inventions.

Conclusion

Donald H. Campbell's contributions to the field of materials science through his innovative patents demonstrate his significant impact on welding technology and ferrophosphorus applications. His work continues to influence the industry