Understanding Brazing and Soldering

What is the first step in correctly brazing a copper joint?

• Preparing the joint

• Finishing off the joint

• Applying the filler material

• Heating the joint

What temperature defines the process of brazing according to the American Welding Society?

• Below 140 degrees Fahrenheit

• 842 degrees Fahrenheit

• 450 degrees Celsius

• 840 degrees Fahrenheit

What type of solder is used for potable water lines?

• 60/40 solder

• 80/20 solder

• 95/5 solder

• Stay-silv 15 rod

What does a stay-silv 15 rod contain?

• 75% copper, 20% silver, 5% phosphorus

• 80% copper, 15% silver, 5% phosphorus

• 85% copper, 10% silver, 5% phosphorus

• 80% silver, 15% copper, 5% phosphorus

What is the burning temperature of oxy-acetylene?

• 6330 degrees Fahrenheit

• 1995 degrees Celsius

• 3620 degrees Fahrenheit

• 3500 degrees Celsius

What is the purpose of using an inert gas like ARGON or NITROGEN during brazing?

• To make the process faster

• To prevent oxidation inside the pipe

• To clean the pipe

• To increase the temperature

What influences proper 'wetting' during the brazing process?

• The type of filler material

• The cleanliness of the pipe and fitting

• The temperature of the flame

• The type of gas used

What is capillary action?

• The process of heating metal to its melting point

• The ability of a liquid to maintain contact with a solid surface

• The cooling process of a brazed joint

• The flow of gas through a torch

What type of flame is desired for brazing?

• Oxidizing flame

• Reducing flame

• Carburizing flame

• Neutral flame

Why is it recommended to open the acetylene valve only a quarter turn after reaching full pressure?

• To prevent overheating

• To control the flame size

• For easy closure in case of an accident

• To save gas