Chapter 13 & 14 Flashcards
- During welding, the electrode covering extends beyond the metal core and serves:
A) to insulate the molten metal against the air
B) to spread out the arc stream
C) as the filler metal for the weld
D) to direct and concentrate the arc stream
E) to prevent slag formation
A) to insulate the molten metal against the air
- A typical low hydrogen rod is:
A) E-7014 B) E-6010 C) E-7018 D) E-6011 E) E-6013
C) E-7018
- According to the AWS classification system for low carbon steel electrodes, and using E7018 as the example, what does the “E” signify?
A) electric arc welding
B) electrode
C) every use
D) current and polarity
B) electrode
- According to the AWS classification system for low carbon steel electrodes, and using E7018 as the example, what does the “70” signify?
A) welding position
B) tensile strength
C) electrode coating, current and polarity
D) metal thickness
B) tensile strength
- According to the AWS classification system for low carbon steel electrodes,and using E7018 as the example, what does the “1” signify?
A) welding position
B) tensile strength
C) electrode coating, current and polarity
D) metal thickness
A) welding position
- According to the AWS classification system for low carbon steel electrodes, and using E7018 as the example, what does the “8” signify?
A) welding position
B) tensile strength
C) electrode coating, current and polarity
D) metal thickness
C) electrode coating, current and polarity
- The submerged arc welding process (SAW) is a high deposition, high quality welding process widely used to join _____ sections in the flat horizontal position.
A) thin
B) thick
C) butt
D) beveled
B) thick
- In submerged arc welding, the arc is not visible to the operator since it:
A) produces an excessive amount of slag B) takes place in the flux feeder tube C) requires a full helmet be worn D) takes place below the flux E) must be done in the dark
D) takes place below the flux
- In submerged arc welding, the electrode is:
A) fed continuously from a coiled spool B) covered with a cellulose coating C) covered with iron powder D) made of finely crushed mineral E) known as flux
A) fed continuously from a coiled spool
- Flux is:
A) a substance to decrease the applied voltage
B) a substance to remove oxides and impurities
C) a substance on the electrode to protect it from moisture and rusting
D) a substance applied to the inside of a pipe joint to aid alignment
E) a substance to shield the weld from the atmosphere
B) a substance to remove oxides and impurities
- _____ welding keeps the atmosphere from the weld bead by a blanket of granular flux.
A) fusion B) shielded metal arc C) machine D) submerged arc E) manual
D) submerged arc
- The _____ joins metal by the heat of an arc between a nonconsumable tungsten electrode and the work piece, with or without the addition of filler metal.
A) submerged arc welding process (SAW)
B) gas tungsten arc welding process (GTAW)
C) gas metal arc welding process (GMAW)
D) reverse metal arc welding process (RMCW)
B) gas tungsten arc welding process (GTAW)
- GTAW is particularly suited to the welding of _____ metals.
A) similar
B) exotic
C) dissimilar
D) cast
C) dissimilar
- The _____ is an arc welding process, which produces the fusion of metals by heating them with an arc between a continuous filler metal (consumable) electrode and the work.
A) submerged arc welding process (SAW)
B) gas tungsten arc welding process (GTAW)
C) gas metal arc welding process (GMAW)
D) reverse metal arc welding process (RMCW)
C) gas metal arc welding process (GMAW)
- _____ is the only arc welding process capable of welding all commercial ferrous and non ferrous alloys.
A) submerged arc welding process (SAW)
B) gas tungsten arc welding process (GTAW)
C) gas metal arc welding process (GMAW)
D) reverse metal arc welding process (RMCW)
C) gas metal arc welding process (GMAW)
- The arc and molten weld metal is protected from the atmosphere by a flow of _____ or reactive gas.
A) air
B) inert
C) non inert
D) hydrogen
B) inert
- The GMAW process is well suited to the _____ passes, on pipe welding.
A) final
B) mid
C) root
D) under
C) root
- On pipe larger than 51 mm, the ends are normally _____ welded together.
A) lap
B) butt
C) electrode
D) fit
B) butt
- During the process of welding, _____ are set up in both the weld metal and in the base metal, adjacent to the weld.
A) stresses
B) cracks
C) inclusions
D) checks
A) stresses
- One of the ways to minimize _____ in the welded joint is to preheat the parts to be welded.
A) cracks
B) stresses
C) inclusions
D) checks
B) stresses
- Postweld heat treatment, often called _____ relieving, consists of uniformly heating the welded parts to a temperature sufficient to relieve most of the stresses created by the welding process.
A) cracks
B) stresses
C) inclusions
D) checks
C) inclusions
- _____ is a melting away of the parent metal which can alter reduce the thickness of the welded joint.
A) fusion
B) undercut
C) overlap
D) underfill
B) undercut
- Lack of _____, or more precisely, incomplete joint penetration, is a group of weld discontinuities where fusion did not occur between weld metal and the base metal or between overlapping weld beads.
A) fusion
B) undercut
C) overlap
D) underfill
A) fusion
- _____ is an excess of deposit metal, which is not fused to the base metal.
A) fusion
B) undercut
C) overlap
D) underfill
C) overlap