The removal of all oxides and surface soil from a tube end and fitting cup is crucial to _____.

• limiting corrosive action

• capillary action in a joint

• the proper flow of solder metal in the joint

______ will help spread the flux over the two surfaces after the joint to be soldered has been assembled.

• small twist

• brush

• wet rag

• firm push on both ends of the pieces being joined

Solder should melt _____.

• within 10 seconds of being placed on the tube

• on contact with the tube

• within 30 seconds of being placed on the tube

• on contact with the torch flame

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

The flux requirement is usually ____ ounces per pound of solder.

• 2

• 3

• 4

• 5

ASTM B813 is the first standard specification that outlines ____ flux used in the joining of copper and copper alloy tube.

• allowable cap size based on the

• standards for the chemical make up of

• performance requirements for soldering

• acceptable removal procedures for excess

After soldering clean the test project with a ____.

• dry or damp cloth

• piece of sandpaper

• piece of steel wool

• file

Shiny areas on the inside of a solder joint indicated ____.

• the flux properly coated the tube and fitting

• the joint was perfectly soldered

• improper heating of the joint or fitting

• an inadequate amount of solder was used

Tags

NGSS.MS-PS3-3

A ____ is frequently caused by the improper heating of a joint or feeding of solder into the joint.

• bare spot

• void

• shiny area

• burr

The three major differences between soldering and brazing include the type of flux used, the composition of the filler metal, and the _____.

• amount of capillary space required

• use of the joint after it has been brazed

• amount of heat required

• arrangement of the tube and fitting

With brazing temperatures, usually ____ Fahrenheit and higher, the base metal will be annealed or softened.

• 600

• 800

• 1100

• 1400

Tags

NGSS.MS-PS1-4