In welding, austenitic and nickel-based materials such as S304H and HR3C tend to form hot cracks in the micro-structure range. These micro-cracks develop straight after welding and may be the starting point for larger cracks under boiler operations. Cracks result in component failure and, as a consequence, in major repair steps.
The welding parameters are primarily responsible here. In particular, heat input, which is calculated from amperage, voltage and welding speed, impacts on micro-crack formation. The greater the heat input (welding parameters), the greater the risk of hot crack susceptibility.
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