CET Formula for Thermal Cracking Susceptibility
The CET formula calculates the hot cracking tendency equivalent by considering the effect of alloying elements on martensite formation more precisely than the classic CEV. This leads to more accurate predictions of cracking tendency in weld zones.
Physicochemical Mechanism of Action
The CET formula (Cohesive Energy Theory) is an advanced method for calculating the carbon equivalent (CEV). It considers not only carbon content but also the effect of other alloying elements on hot cracking tendency. This leads to a more precise assessment of the risk of hot cracks.
Metallurgical Relevance & Welding Risks
The CET formula helps predict hot cracks in weld zones, especially in high-temperature resistant steels. Incorrect calculations can lead to insufficient safety and result in cracking. Therefore, correct application is crucial for quality assurance.
Workshop Practice & Action Instructions
To apply the CET formula, the following steps must be performed:
1. Determine the carbon content (C) and concentrations of other alloying elements.
2. Use the specific values for the CET coefficients of these elements.
3. Calculate the hot cracking tendency equivalent using the formula: CET = C + Σ (Coefficient × Concentration).
4. Compare the result with the specific threshold values for the respective alloy and process variant.
5. Adjust welding parameters as needed to minimize cracking tendency.