Weld-thru primer is a type of primer that is used to prepare metal surfaces for welding. It is designed to protect the metal from oxidation and corrosion during the welding process, and also to improve the flow of the weld.
Copper and zinc are both commonly used as active ingredients in weld-thru primers. The main difference between the two is the way they protect the metal from corrosion.
Copper weld-thru primer is typically made with a high concentration of copper, which is known for its excellent corrosion-resistant properties. Copper is a cathodic metal, meaning it will corrode before the steel it is protecting. This means that if a small area of the steel is exposed to the environment, the copper will corrode in that area instead of the steel. The copper also creates a small electrical current that helps to prevent corrosion. Copper weld-thru primers are typically used when the metal that is being welded is going to be exposed to harsh environments such as marine or industrial.
Zinc weld-thru primer, on the other hand, is typically made with a high concentration of zinc. Zinc is also an active metal that corrodes before the steel it is protecting. Zinc also creates a small electrical current that helps to prevent corrosion. Zinc weld-thru primers are typically used in automotive applications, as they provide a good temporary corrosion protection until the final paint is applied.
Both copper and zinc weld-thru primers provide a protective layer between the metal and the atmosphere to prevent oxidation and corrosion. They also improve the flow of the weld which helps to fill in small gaps and improve the overall quality of the weld. However, copper weld-thru primer is generally considered more corrosion-resistant than zinc weld-thru primer and is used in harsher environments, while zinc weld-thru primer is commonly used in automotive applications. It is important to select the appropriate primer based on the specific application and environment in which the metal will be used.
The primer should be applied in a thin and uniform layer, making sure to cover all the areas that will be welded. Once applied, the primer should be allowed to dry completely before welding.
It’s important to note that the fumes produced when using Weld-thru primer are toxic, and therefore it is important to use adequate ventilation and personal protective equipment. The primer should also be used in a well-ventilated area, away from open flames and other sources of ignition.