What is the term for the time from ignition until the molten metal begins to pour?

The term for the time from ignition until the molten metal begins to pour is referred to as "tap time." This is a critical phase in the thermite welding process, as it reflects the duration required for the thermite reaction to reach its peak temperature and generate enough molten metal. During this period, the chemical reaction is actively producing heat and molten material, which is essential for achieving a successful weld.

Understanding this term helps in recognizing the workflow of thermite welding, as it allows the welder to anticipate when they need to prepare for the pouring phase, ensuring that the setup is ready for the molten metal once it becomes available. The significance of tap time lies in its impact on the quality of the weld; proper timing is crucial to ensure that the molten metal is utilized effectively for optimal bonding.