Bringing a component to a controlled temperature before the operation that follows.
Pre-heating raises a component to a set temperature before something else happens to it. Before welding, to slow the cooling rate and avoid hard, crack-prone weld zones. Before forming, to reduce the force required. Before assembly, to open up a fit. Before coating, to drive off moisture and improve adhesion.
In every case the requirement is the same and it is not "hot". It is a specific temperature, reached uniformly through the region that matters, held while the next operation happens.
Induction is well suited because it heats where the coil is, quickly, and because a machine with a pyrometer in the loop heats to a measured temperature rather than for a fixed time.
Local: heat the weld preparation, not the whole fabrication.
Measured: closed-loop control on actual temperature, so parts arriving at different temperatures still finish correct.
Fast: no waiting for an oven or a soak.
Clean: no flame near a workpiece that may be about to be welded, coated or filled.
We will confirm the configuration for your material, component geometry and production requirements.
A pre-heat specification calls for a temperature at a location, often with a minimum interpass temperature to maintain. A timer does not deliver that; a pyrometer in a closed loop does. This is the single most common reason a pre-heating installation fails to meet its own specification.
Pre-heating almost always wants the heat through the section rather than at the surface, so it uses lower frequencies than hardening or brazing.
Send a drawing, the material, the case depth or temperature you need, and your production rate. Our engineers will help define the right machine for your process.
