Heat Input

Heat input is the energy per unit length during welding, which affects the microstructure and cooling conditions.

Physical-Chemical Mode of Action

Heat input refers to the amount of energy introduced per unit length into the material. It is proportional to voltage and current during welding.

Metallurgical Relevance & Welding Risks

Excessive heat input can cause too fast cooling, leading to hard, brittle martensite and increased cracking risk. Too low heat input causes overly slow cooling, resulting in coarse grain and reduced toughness.

Workshop Practice & Procedures

To achieve optimal heat input, precisely control voltage and current during welding. For steel pipes, recommended heat input is about 100-200 J/cm. For high-temperature materials like Inconel, keep heat input lower to ensure controlled cooling.

MetallurgieSchweißtechnik