Welding Week 2 Flashcards
Type of current usually used for TIG on aluminum
AC (alternating current)
A separation at the joint root between the work pieces
Root opening
4 weld positions
Flat
Horizontal
Vertical
Overhead
What does AWS stand for?
American Welding Society
Ratio of arc time to total time
Duty cycle
Welding is a safe occupation if proper precautionary measures are always _____.
Observed
Wearing proper eye protection while welding prevents _____.
Arc flash
Avoid breathing air in the _____ directly above the _____. It prevents illness from overexposure.
Fume plume
Arc
When welding on exotic metals, use _____ exhaust.
Mechanical exhaust
When the electrode holder is not in use, hang it in _____ provided.
Bracket
Shield others from _____ causing arc flash while welding.
Ultra violet rays
Correct ____ by pausing at each side of the weld.
Under cutting
Slang terms for SMAW (Shielded metal arc welding)
Stick welding
Stick electrode welding
Negative electrode to positive work piece
DCEN (straight polarity welding)
3 main functions of electrode coating
Shield pool
Stabilize and direct arc
Produces slag which protects pool from atmosphere, slows cooling rate
Electric arc process that produces coalescence of metals by heating them with an arc between a continuous filler metal electrode and the work piece
GMAW (gas metal arc welding)
Type of welding that normally uses direct current electrode positive
GMAW
The _____ drives the electrode wire from the wire spool through the cable and gun to the welding arc.
Wire feeder
The push system is designed to push wire through the wire _____.
Wire conduit (liner)
What system displaces air around arc to prevent contamination of the molten pool by oxygen and nitrogen in the atmosphere?
Shield gas system
2 gases aided for mild/low alloy steel
Argon (75% AR) Carbon dioxide (25% CO2)
Steel wires normally have thin _____ wire to improve electrical pick up and protect the wire from oxidation.
Thin copper wire
What type of welding is used with DCEN (no shielding gas used) and DCEP current?
Flux cored arc welding (FCAW)
What kind of electrode provides shielding by the flux contained from with in?
Tubular electrode
Arc welding process that produces coalescence of metals by heating them with an arc between a tungsten electrode and work piece.
Gas tungsten arc welding (GTAW)
In GTAW the _____ produces the arc.
Tungsten electrode
What method has a relatively high degree of welding skill where the welder controls torch with one hand and feeds filler metal with the other?
Manual method
3 things TIG welder must control
Torch position
Filler rod depositing
Speed of travel
In GTAW, what are the two most common shielding gases?
Argon and helium
2 great qualities tungsten is used for
High melting point
Excellent electrical conductor
What kind of metals can can be cut by plasma process?
Ferrous and nonferrous
Thermal cutting process which will cut anything that conducts heat and electricity.
Plasma arc cutting
Popular for gouging and cutting metal
Air carbon arc cutting
The application of heat to the base metal immediately before welding, brazing, soldering, thermal spraying or cutting.
Preheating
Welding should/should not be done when the ambient temperature is below 0 degrees F.
Should not
All position certified weld
6G
What is developed when there is good penetration on a root weld?
Keyhole
Type of welding that is shielded from an inert gas supply.
GMAW
Reverse polarity
DCEP
Vertical position weld
3G
Type of welding that utilizes a rod coated with a baked flux.
SMAW
Electrode is negative
DCSP (A.K.A. DCEN)
Flat fillet weld position
1F
Burns out impurities after the root pass
Hot pass
Covers the weld deposit and provides additional protection from the atmosphere
Slag
Type of welding where a tubular or cored electrode is used.
FCAW
Type of welding that uses a tungsten electrode.
GTAW
Before a welder can begin work on any job, they must be _____
Certified
What is required if using a different process or a procedure is drastically altered during a welding job?
Requalification
What is the most widely used and most popular weld inspection?
Visual
What kind of weld inspection is non-destructive?
Liquid penetrant inspection
Coated electrode for SMAW that has 60000 PSI tensile strength. Can be welded in any position on carbon steel. 0 means manufactures characteristics.
E6010
Electrode is a solid wire that can be used as filler rod in GMAW and GTAW due to the ER designation. Has a 70000 PSI tensile strength. The 6 is wire chemistry
ER70S-6
A 316 stainless steel electrode rod or stainless steel wire that can be filler metal in GMAW or GTAW. L means low carbon
ER316L
Flux cored electrode that cannot be used as filler metal. Used in FCAW. 7 designates 70000 PSI tensile strength. 1 means it can be welded in all positions. T means it is tubular. -1 identifies as self shielded. Used on carbon steel
E71T-1
When gas cylinders are empty, close the valve and mark cylinder ____.
Empty
