Question

Surfaces to be joined by soldering or brazing shall be cleaned bright by?

1) Using sandpaper
2) Using a wire brush
3) Using a chemical cleaner
4) Using a cloth

Answer 1

The surfaces to be joined by soldering or brazing should be cleaned bright using a chemical cleaner.

Step-by-step explanation:

The surfaces to be joined by soldering or brazing should be cleaned bright using a chemical cleaner.

Cleaning the surfaces removes any dirt, oils, or contaminants that could interfere with the joining process. Sandpaper and wire brush can be used to remove oxidation or rust, but a chemical cleaner is necessary to achieve a bright and clean surface.

Rubbing with a cloth is not sufficient to clean the surfaces thoroughly, and cooling or submerging the surfaces in water do not provide the required level of cleaning or preparation for soldering or brazing.