AMS 261 Unit 3 Test Questions With
Complete Solutions
Where would most of the heat be Arc Welding? - ANSWER 70% of the heat in an arc
welding circuit is at the positive (+) side of the welding circuit.
EX: In the DCSP setting the normal polarity of the electrode is negative so whatever
you're welding is the positive side
What pressure level should you be cautious of when working with Acetylene? Which will
explode? - ANSWER 15 PSI can become unstable
30 PSI will be unstable or explode
What are the parts of a bead and their dimensions? - ANSWER Parts are the bead, face,
reinforcement, toe, throat, and root.
Bead/Face width is 3 - 5T, Reinforcement is 1/4 - 1/2T, root is 1/2T, and for throat 100%
heat penetration should be achieved.
What does GTAW/TIG mean? - ANSWER Gas Tungsten Arc Welding (Tungsten Inert Gas)
What does GMAW/MIG mean? - ANSWER Gas Metal Arc Welding
, Metal Inert Gas
Two advantages are ease of use and speed.
What is SMAW/ stick welding? - ANSWER Shielded Metal Arc Welding
What does DCSP/ DCEN mean? - ANSWER Direct Current Straight Polarity
The electrode is negative (-), Used to weld steel, and Used to weld CRES.
What does DCRP/ DCEP mean? - ANSWER Direct Current Reverse Polarity
Electrode is positive (+), Not used very much in GTAW, and Can be used to "ball" the end
of the electrode for AC welding.
What does ACHF mean? - ANSWER Alternating Current High Frequency
It stabilizes the arc, It makes the arc easier to start, and It makes the arc smoother and
easier to use
What is gas welding? - ANSWER OAW, oxyacetylene welding
Oxygen is mixed with a fuel gas
Complete Solutions
Where would most of the heat be Arc Welding? - ANSWER 70% of the heat in an arc
welding circuit is at the positive (+) side of the welding circuit.
EX: In the DCSP setting the normal polarity of the electrode is negative so whatever
you're welding is the positive side
What pressure level should you be cautious of when working with Acetylene? Which will
explode? - ANSWER 15 PSI can become unstable
30 PSI will be unstable or explode
What are the parts of a bead and their dimensions? - ANSWER Parts are the bead, face,
reinforcement, toe, throat, and root.
Bead/Face width is 3 - 5T, Reinforcement is 1/4 - 1/2T, root is 1/2T, and for throat 100%
heat penetration should be achieved.
What does GTAW/TIG mean? - ANSWER Gas Tungsten Arc Welding (Tungsten Inert Gas)
What does GMAW/MIG mean? - ANSWER Gas Metal Arc Welding
, Metal Inert Gas
Two advantages are ease of use and speed.
What is SMAW/ stick welding? - ANSWER Shielded Metal Arc Welding
What does DCSP/ DCEN mean? - ANSWER Direct Current Straight Polarity
The electrode is negative (-), Used to weld steel, and Used to weld CRES.
What does DCRP/ DCEP mean? - ANSWER Direct Current Reverse Polarity
Electrode is positive (+), Not used very much in GTAW, and Can be used to "ball" the end
of the electrode for AC welding.
What does ACHF mean? - ANSWER Alternating Current High Frequency
It stabilizes the arc, It makes the arc easier to start, and It makes the arc smoother and
easier to use
What is gas welding? - ANSWER OAW, oxyacetylene welding
Oxygen is mixed with a fuel gas
