20 Questions
Which of the following is true about brazing?
Brazing requires less heat than welding.
Which metals can be joined by brazing?
Copper and steel.
What is the strongest type of brazed joint?
A joint with a close fit.
Which type of joint is NOT recommended for silver soldering?
Butt joint
What type of flame is recommended for silver soldering?
Neutral flame
Which type of tungsten electrode is most suitable for DC operations on transformer-based TIG welding machines?
Thoriated electrode
Which of the following is true about flux in brazing?
Flux helps remove oxidation from the metal surface
What is the purpose of preheating the base metal in brazing?
To reach the flowing temperature of the filler metal
Why is controlling the temperature of the base metal important in brazing?
To ensure the brazing filler flows properly
Which alloys typically work with brazing products that have the flux contained in hollow spaces in the filler metal itself?
1100, 3003, and 6061
How is cleaning after brazing accomplished?
Using hot water and a clean stainless brush
What is the most common general-purpose solder?
Half-and-half (50/50)
Which of the following is NOT a recommended step in TIG welding 4130 steel tubing?
Weld where there is a breeze or draft
What is the purpose of preheating and post-weld heat treatment in TIG welding 4130 steel tubing?
To avoid cracking
Which filler metal alloy is suitable for welding austenitic type stainless steel?
AISI No. 309
Which type of gas is preferred for TIG welding aluminum?
Argon
What is the purpose of back purging during the welding process?
To promote a sound weld with a smooth inner bead profile
Which type of polarity is preferred for manual welding operations of magnesium?
DC reverse polarity
What is the recommended distance between the tungsten tip and the surface of the material when TIG welding aluminum?
1/16 inch
What are the recommended welding beads and welding speed for welding magnesium alloys?
Smaller welding beads, faster welding speed
Test your knowledge on the importance of flux in silver soldering and the cleaning requirements for achieving strong silver solder joints.
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