Specifics of Sanitary Food Grade Welding

Welding of all kinds plays a large role in commercial-grade food equipment. From the shelving units used to store fresh, frozen, and dry foods to stoves and ovens used daily, welding operations are used in the manufacturing process. Stud welding, in particular, is a commonly used manufacturing technique for many types of equipment used in restaurants, hospitals, hotels, and other commercial kitchens as well as in food production and packaging industries. Even some equipment in home kitchens is made with certain components of stud welding. Northland Fastening Systems provides everything you might need for all applications of food grade welding, from studs of all dimensions to tools for rent and purchase in addition to the expert services of our own technicians.


Equipment used in the food industry must meet U.S. Department of Agriculture (USDA) and Food and Drug Administration (FDA) standards for sanitation, including the very specific requirements of the FDA’s Food Safety Modernization Act (FSMA). This means, every step of the fabrication process must guarantee that end results meet those standards. When it comes to stud welding, regulations are in place for food grade welding processes.


The foundational requirements of food grade welding include:


  1. Precise Finish: A smooth finish with the elimination of burrs and sharp particles of metal of all kinds must be accomplished. Even microscopic burrs or sharps can compromise a food grade piece of equipment. Rough surfaces should also be smoothed and finished in a way that removes any spaces for food particles to get caught and build bacteria colonies.
  2. Sealed and Bolted: The full framework of a piece of equipment should be sealed at connection points. Simply bolted connection points can have opportunities for increased vulnerability to corrosion or storage of bacteria. Components that can be detached for cleaning must also be built in a way that reattaches with a full seal.
  3. Correct Design: The equipment should be designed in a way that only uses internal angles or corners. External angles create spaces in which bacteria can thrive, which compromises any food grade equipment.
  4. Surface Working: Surfaces should be worked in a way that doesn’t overstress the materials. Overworking can leave any layers protecting against oxidation susceptible to being quickly stripped away.
  5. Compatible Weld: The stud and the surface material must be compatible. Any incompatible welds are more vulnerable to corroding and contamination food or cracking under thermal stress.


If you are fabricating food grade equipment of any kind, it’s critical to consider these requirements and any other standards outlined in the FSMA before beginning your project. To learn more about food grade welding, and stud welding overall, contact Northland Fastening Systems today at (651) 730-7770 or request a quote online to get started on your stud welding project.

The Role of Molecular Fusion for Stud Weld Fastening Systems

Stud welding as a fastening system is a highly valuable manufacturing operation that can be applied to a wide range of industrial applications. From food-grade welding to structural steel fabrication, stud welding plays a critical role in the connection of various metals. At Northland Fastening Systems (NFS), we are dedicated to operating as a one-stop-shop for all your stud welding needs, including stud welding tools for rent or purchase, studs of varying dimensions and materials, stud welding accessories, and our own expert services.


Because stud welding can be applied to such a wide range of industrial projects, big and small, we believe it’s necessary to provide an equally wide range of stud welding supplies as well as our technical support services. NFS is a comprehensive provider of the tools you need to complete a project using studs as industrial fastening systems.


Today, welding as a fastening system is much different than the forge welding of days past. Instead of simply using the heat of a forge, welding can be applied in concentrated electrical arcs in addition to many other types of weld operations such as induction, laser, and chemical operations.


The majority of stud welding is done using a drawn arc electrical current. The filler tip of a stud and the metal of the base surface are heated using the current, and they become molten. Then the arc is shut off, and the stud is moved onto the base. As the molten metals combine and cool, molecular fusion occurs.


Molecular Fusion

To create an effective, true weld connection, molecular fusion is necessary. Drawn arc stud and CD stud welding use heat, closeness, and cleanliness of metal atoms to create a bond at the molecular level. The process of heating the stud and base surface with an electrical arc current doesn’t just melt one metal onto the other. It effectively joins one metal molecule to another and fully fuses two atomic structures into one. In this way, stud welding creates a connection point stronger than both the stud or the base material alone.


The role of molecular fusion is key to the use of stud welding as a fastening system for construction, ship building, food equipment welding, automotive fabrication, sheet metal manufacturing, electrical enclosures, bridge building, and much more. Without the strong connection point that molecular fusion provides, the components and assemblies built in many industries wouldn’t be the reliable structures and tools they are today.


To learn more about stud welding fastening systems, contact NFS at (651) 730-7770 or request a quote online today.

Determining Weld Strength for Drawn Arc Stud Welding

Many forms of welding have been used for centuries to build strong, long-lasting parts and countless buildings and other structures. Included in these forms of welding are the various types of stud welding, all of which provide one of the strongest connection points of any weld type. In fact, both capacitor discharge (CD) and drawn arc stud welding form a bond that is stronger than either the weld stud or the base material.


Because of the strength of these connections, stud welding is an operation that is key to many manufacturing industries. No matter what industry you work in, Northland Fastening Systems has the tools, supplies, and services you need for both drawn arc stud welding and CD stud welding.


We are committed to providing a comprehensive range of welding studs in multiple standard dimensions as well as custom made-to-order studs. In addition, we offer welding tools for rent and purchase and our own expert services.


When it comes to drawn arc stud welding in particular, determining the required stud specifications is critical for a strong, lasting weld that can hold the weight or other stresses it will bear. Typically, drawn arc stud weld points are used in heavier construction projects and require precise performance in the field. This performance depends on the strength of the weld point, which in turn depends on weld fusion and weld penetration.


Weld Fusion

Simply put, weld fusion is the point where the metal of the stud connects to the metal of the surface. This fusion is a chemical connection generated by the heat of the welding arc rendering both stud and surface metal and joining those points with an atomic bonding process. In order to have a strong, reliable weld point, the spread of the fusion must be as far up the stud, as deep into the surface, and wide enough in diameter to create the necessary connection.


Generating the correct level of fusion without using unneeded energy or compromising the stud requires a highly specific combination of time, power, and force. For the majority of drawn arc stud welding operations, these combinations are predetermined by industry engineers specializing in stud welding physics. These specifications can be applied to different welding projects within a varying range that gives the welder the information needed to apply the correct level of weld fusion and create a strong weld connection.


NFS welding technicians can help you determine the specifications you need to apply precise, high-quality drawn arc stud welding operations to your project. To learn more about weld connection points, our stud welding services, and the welding studs we provide, contact Northland Fastening Systems at (651) 730-7770 today or request a quote online. Learn more about welding fusion here.