Heat Input
Heat input is the process of introducing thermal energy into the material during welding. It affects cooling and the microstructure of the weld.
Physicochemical Mechanism of Action
Heat input refers to the energy flow in the form of heat that is introduced into the material during the welding process. This occurs through electrical conduction in electrolytic connections or through radiation from lasers or other high-intensity light sources.
Metallurgical Relevance & Welding Risks
Proper control of heat input is crucial for weld quality. Too little energy leads to insufficient fusion and potential cracks, while too much energy can cause overheating and excessive cooling stress, leading to distorted or glass-hard microstructures and increased risk of hot cracking.
Workshop Practice & Instructions
To effectively control heat input, energy settings must be precisely adjusted. For TIG welding, current and gas flow should be optimized. For laser welding, laser power and travel speed are critical. The temperature in the weld zone should be continuously monitored and adjusted as needed to achieve a homogeneous structure.