Thermal Management
Heat management describes the behavior of heat during the welding process. It affects temperature distribution and prevents hot cracking and hardening.
Physical-Chemical Mechanism of Action
Heat management is the process by which heat is transferred from one area to another. In welding, this occurs through radiation, convection, and heat conduction through metals. The temperature distribution affects the material's microstructure and the mechanical properties of the weld.
Metallurgical Relevance & Welding Risks
Uneven heat management can lead to hot cracking and hardening. Too fast heat transfer results in glass-hard martensite, which is prone to cracking. Too slow heat transfer leads to grain coarsening and reduced toughness of the steel.
Workshop Practice & Action Instructions
To ensure optimal heat management, control interpass temperature and welding speeds. Use appropriate throttles and cooling systems. For heavy steels or high stress, ensure even heat transfer. A time span of t8/5 between 10 and 20 seconds is often suitable to ensure adequate cooling.