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Welding Electrode Rod Classification by Application
○Structural Steel Welding Rods: Primarily used for welding various carbon steel and low-alloy steel components, they are the most widely used type of welding rod. Different types are available based on the strength grade and chemical composition of the weld metal to meet different strength requirements.
○Stainless Steel Welding Rods: Used for welding stainless steel and heat-resistant steels, they ensure welds with corrosion resistance and high-temperature performance similar to those of the parent metal. Depending on the type of stainless steel, welding rods can be classified as chromium stainless steel welding rods, chromium-nickel stainless steel welding rods, and others.
○ Hardfacing welding rods: Used to deposit a metal layer with special properties onto the surface of a workpiece to improve its wear resistance, corrosion resistance, and heat resistance. The alloy composition and properties of the hardfacing welding rod can be designed based on specific application requirements.
○ Cast iron welding rods: Specifically used for welding cast iron. Due to cast iron’s high carbon content and poor weldability, cast iron welding rods require specialized chemical composition and processing properties to prevent defects such as cracks during welding.

Welding Electrode Rod Classification by coating type
○ Acidic welding rods: The coating contains a high concentration of acidic oxides, such as silicon dioxide and titanium dioxide. Acidic welding rods offer stable arcs, excellent welding processability, are insensitive to rust and oil stains, and produce aesthetically pleasing welds. However, the weld’s mechanical properties and crack resistance are relatively poor, and they are generally used for welding general structural components.
○ Basic welding rods: The coating contains a high concentration of basic oxides, such as calcium carbonate and calcium fluoride. Basic welding rods produce weld metal with high mechanical properties and crack resistance, but they suffer from poor arc stability, are sensitive to rust and oil contamination, and exhibit relatively poor welding process performance. They are generally used for welding critical structural components.

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