[ Problem Point ]
It was in trouble because Flushing cleaning solution after plumbing processing was left.
[ ⇒Kaizen Point ]
Rust did not go out because it had dried remaining water by the Air Blow Heater.
Related page:
No.54 Drying of Drilled Hole 
No.64 Metal Parts Drying after Washing 
No.100 Differential temperature inspection of the heat pipe 
No.8 Heating unit for drying booth 
No.82 Drying of the car after washing 
No.98 Drying of the adhesive seal 
No.70 Heat source of nitrogen shield soldering iron 
No.77 Heating of tungsten material