What are the ideal uses for different welding rods?

Welding rods can be divided into many types according to different classification standards, and each type has its specific ideal use.
1. Classification by use:
Structural steel welding rods: suitable for welding low-carbon steel and low-alloy structural steel, ensuring certain mechanical properties in normal temperature natural environment.
Molybdenum and chromium-molybdenum heat-resistant steel welding rods: mainly used for welding pearlite heat-resistant steel, such as R317, R307, providing high-temperature working ability.
Stainless steel welding rods: used for welding stainless steel and heat-resistant steel, such as A132, A507, with corrosion resistance and mechanical properties of atmospheric corrosive media.
Low-temperature steel welding rods: suitable for structures working under various low-temperature conditions, such as W707, with low-temperature working ability.
Overlay welding rods: used to obtain overlay layers with wear resistance, corrosion resistance or red hardness, such as D2123.
Cast iron welding rods: dedicated to welding repair or welding cast iron, such as Z3083.
Nickel and nickel alloy welding rods: used for welding nickel and its alloys, and can also be used for surfacing, welding cast iron and welding of dissimilar metals, such as NCrFe33.
Copper and copper alloy welding rods: used for welding copper and its alloys, dissimilar metals and cast iron, etc.3.
Aluminum and aluminum alloy welding rods: used for welding aluminum and aluminum alloys.
Special purpose welding rods: used for welding in special environments, such as underwater welding or cutting3.
2. Classification by coating properties:
Acidic welding rods: The coating contains acidic oxides, and the welding process is good, suitable for general structures, but the mechanical properties are low.
Alkaline welding rods: The coating contains alkaline oxides, with strong deoxidation and desulfurization capabilities, good weld performance, suitable for welding alloy steel and important carbon steel, but the process performance is poor.
3. Classification by the main chemical composition of the coating:
Titanium oxide type welding rod
Titanium calcium oxide type welding rod
Ilmenite type welding rod
Iron oxide type welding rod
Cellulose type welding rod
Low hydrogen type welding rod
Graphite type welding rod
Salt-based welding rod.
4. Classification by slag characteristics:
Acidic welding rod: The slag is mainly composed of acidic oxides, with good welding processability, but low weld performance.
Alkaline welding rod: The slag is mainly composed of alkaline oxides and ferroalloys, with good weld performance, but poor process performance.
When selecting welding rods, comprehensive consideration should be given to factors such as the properties of the materials being welded, structural characteristics, use conditions, and economic efficiency of welding technology.