p10-3 task1 Flashcards
a fully dioxidized filler Rod is used for welding mild Steel in order to
- control porosity
- add alloying elements to the weld metal
- prevent hot shortness
- prevent filler rod from oxidizing or rusting
a. control porosity
in the filler rod designation CR48OS-2, the letter S stands for
- steel
- selected
- stabilized
- solid
d. solid
the length of the filler rods that are used for the GTAW welding are
- 760 mm (30”)
- 610 mm (24”)
- 178 mm (7”)
- 914 mm (36”)
d. 914 mm (36”)
in the filler Rod designation ER480S-2 the number 480 refers to
- tensile strength
- filler alloy
- weld classification
- weld specification
a. tensile strength
mild steel filler rods for GTAW should be stored in a
- cool, humid Place
- warm, dry place
- in a refrigerator
- in a warming oven
b. warm, dry place
which current is best suited for GTAW on mild steel?
- DCEN
- DCEP
- AC
- ACHF
a. DCEN
which shielding gas is preferred for GTAW on mild steel?
- oxygen
- compressed air
- argon
- helium
c. argon
which type of GTAW electrode is recommended for mild steel?
- pure tungsten
- thoriated tungsten
- zirconium tungsten
- striped tungsten
b. thoriated tungsten
which of the following contributes to insufficient penetration in GTAW?
- rate of travel is to slow
- welding current is too high
- root gap is too wide
- welding current is too low
d. welding current is too low
an arc that is too long may contribute to
- insufficient penetration
- dark irregular beads
- undercut
- both A and B
- both B and C
d. both A and B
which of the following contributes to burn-through?
- excessive travel speeds
- high welding currents
- long arc length
- excessive filler metal
b. high welding currents
undercut may be caused by
- low welding currents
- excessive filler metal
- high travel speeds
- excessive side-to-side manipulation of the torch
d. excessive side-to-side manipulation of the torch
