Once you have these two numbers, the calculator's job is nearly complete. By plotting the point (Cr-eq, Ni-eq) on the diagram's graph, a welding engineer can instantly read the predicted Ferrite Number (FN) and the anticipated primary solidification mode (e.g., FA mode for ferrite-austenite). This prediction is vital for selecting appropriate filler metals and welding parameters.
Solidifies as primary ferrite, transforming to austenite during cooling. This is the ideal zone for most austenitic welds to prevent cracking.
The WRC-1992 diagram calculator is an essential tool in the modern welding engineer's arsenal. It provides a scientific, data-driven approach to predicting stainless steel weld metal microstructure, which is critical for ensuring mechanical properties, corrosion resistance, and resistance to hot cracking. wrc-1992 diagram calculator
Acquire the weight percentages of Cr, Ni, Mo, C, N, Cu, and Cb (Niobium) from the test certificate of the filler metal.
In 1992, the Welding Research Council (WRC) released the most accurate "map" yet. It introduced the Ferrite Number (FN) system, replacing vague percentages with a standardized, magnetic-based measurement. How the "Calculator" Works Once you have these two numbers, the calculator's
Note: Unlike earlier models, Silicon (Si) is omitted here because its effect was found to be negligible in this specific range.
It is highly effective for predicting the results of dilution when joining different metals, such as mild steel to stainless. It provides a scientific, data-driven approach to predicting
Solidifies as ferrite with subsequent transformation to austenite. (Preferred for hot cracking resistance) F (Ferritic): Solidifies entirely as ferrite. ResearchGate 3. Application in Welding
: The diagram identifies the primary solidification mode (A, AF, FA, F), which helps predict the risk of hot cracking: A (Austenitic) : Single phase austenite.
It provides a graphical and mathematical method to estimate the ferrite content (expressed as ) in the weld metal. Ferrite is a desirable microstructural phase in austenitic stainless steel welds, as it helps prevent hot cracking—a common and serious defect during welding.