What are the key differences between ER 308, ER 308L, and ER 308LSi stainless steel sub-arc wires?
ER, 308, ER 308L, and ER 308LSi are three distinct variants of Stainless Steel Sub-arc Wires, each designed to cater to specific welding requirements. The key differences lie in their chemical compositions and intended applications. ER 308 contains 18% chromium and 8% nickel, making it suitable for general-purpose welding of austenitic stainless steels like 304 and 304L.
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On the other hand, ER 308L has a lower carbon content, providing improved resistance to intergranular corrosion. It is particularly favoured for welding low-carbon 304L stainless steel components in environments prone to sensitization.
ER 308LSi incorporates silicon as an alloying element, which enhances the wire's weldability and fluidity, reducing the risk of porosity. That makes ER 308LSi ideal for joining stainless steel types 304, 304L, and similar grades in applications demanding precision and smooth welds, such as thin sheets and intricate structures. The selection of the appropriate wire depends on the specific stainless steel being welded and the desired mechanical properties of the joint.