The extent of an over-temperature inspection is governed by the thermal exposure the part experienced: how hot it got and how long it stayed there. Higher peak temperatures accelerate damage mechanisms like diffusion, oxidation, creep, and metallurgical changes, so more severe flaws can develop. The longer the material remains at elevated temperature, the more extensive those flaws can become, which means the inspection must cover more areas, deeper checks, and sometimes disassembly to verify integrity. While factors like cooling rate, RPM, or ambient conditions can influence how heat moves, they don’t set the fundamental scope—that’s driven by the temperature reached and the duration of exposure. Maintenance timing doesn’t determine the extent of the damage either; it’s the actual thermal history of the event. So the correct choice is that the temperature reached and the length of time at that temperature determine how far the inspection should go.

Repair methods commonly recognized in turbine overhaul practice are welding to build up or join metal, blending to smooth and shape the surface after welding, and electroplating to restore surface properties. Re-welding isn’t listed as a separate repair process because repeating welding on an area that has already been welded isn’t treated as its own repair category in standard repair catalogs. Additional welding adds heat, increases the risk of cracking or distortion, and if more material is needed, technicians typically handle it within the same welding procedure or choose a different method (like blending or deposition), rather than labeling “re-welding” as a unique process. So the option that isn’t listed as a repair process is the one involving re-welding.

In a turbine overhaul, after the parts have been taken apart, cleaned, and inspected, the step where components are put back together is reassembly. This phase involves returning all parts to their proper order, fastening them with the correct torque and sequence, seating seals and gaskets, restoring lubrication paths, and confirming that alignments and clearances are correct. Reassembly is what prepares the turbine for the final checks and testing. Disassembly is the process of taking components apart, cleaning removes contaminants, and testing evaluates performance after assembly. The act of putting the turbine back together is what reassembly is all about.

Ink marking should not be used on surfaces that will contact another surface after assembly because the mark can transfer to the mating part, smear, or rub off during handling and fitting. This contamination can affect the fit, sealing surfaces, or lubrication paths and obscure the reference mark that you need for correct reassembly. In turbine overhaul, keeping mating surfaces clean and free of ink residue is essential, so avoid ink marks on areas that will be in contact after assembly. On surfaces that won’t touch another part, ink can be acceptable, provided the mark remains legible and doesn’t interfere with function.