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How to weld dissimilar metals

Selecting the correct filler metal is paramount when welding dissimilar metals, as it dictates the strength, ductility, and corrosion resistance of the new joint. Choosing the wrong filler can lead to severe issues like cracking, reduced strength, accelerated corrosion, and ultimately, premature failure of the welded assembly. This post explains why filler metal compatibility is crucial, especially concerning thermal expansion differences and preventing brittle phases. It provides examples of dissimilar metal welding scenarios, like stainless steel to carbon steel, highlighting how specific filler metals like ER309LSi are engineered to bridge metallurgical gaps and ensure long-term integrity under various service conditions.

Yield Strength vs Tensile Strength of Steel and Other Metals

While welders often prioritize tensile strength, understanding both yield and tensile strength is crucial for metalwork. Yield strength indicates when a material begins to permanently deform, while tensile strength is the maximum stress it can withstand before breaking. This post defines both, explains their behaviors, and highlights their importance in design, using a bridge example to illustrate how a structure can deform without catastrophic failure if loads exceed yield but not tensile strength.