Week 2 Flashcards
Essentially welding is a safe occupation if proper precautionary measures are always ___
Observed
To prevent illness due to overexposure of hazardous material from the fume plume you should avoid what
Breathing directly over it
The ___ process is an electric arc process that produces a coalescence of metals by heating them with an arc between a continuous filler metal and a work piece, shielding is provided by gas
MIG
When using ___ polarity the current flow is from negative electrode to the positive workpiece
DCEN
The shielded metal arc welding process is referred to as ___ welding
Stick
4 basic welding positions are flat, horizontal, vertical and ___
Overhead
The first pass in a multipass butt weld is called the
Root pass
One of the inert gas mixes used to MIG weld mild and low alloy steel contains 25% ___ and 75% ___
25% CO2 and 75% argon
In TIG welding the tungsten electrode is used to produce a ___ which creates a puddle on the base metal
Arc
Tungsten is used because of what 2 important characteristics
High melting point and excellent electrical conductor
The current used in TIG welding aluminum is generally
AC
Plasma arc cutting is a ___ cutting process which cuts anything that conducts heat and electricity
Thermal
What is AWS stand for
American welding society
T/F
When welding metal with hazardous coating such as Galvanized, the welder should use mechanical exhaust , ventilation will prevent over exposure
True
T/F
When when an electric holder is not in use hang it on a gas cylinder
False
T/F
A liquid die penetration kit is a destructive method used
False
T/F
A TIG welding torch can only be water cooled
False
T/F
Flux core arc welding can be used in either DCEN or DCEP
True
T/F
In TIG welding stainless steel the shape of the tungsten is shaped to a pencil point
True
T/F
Safety awareness is important in air carbon arc cutting because…
True
T/F
Can you cut ferrous and non ferrous materials with a plasma cutter
True
T/F
You can weld downhill with 7018
False
T/F
GTAW post flow setting is mainly used to cool down a tungsten electrode and protect the weld pool after the welding process has stopped
True
Duty cycle is defined as the ratio of __ time to __ time
Arc, total
Welders should protect themselves other workers and equipment from the heat, sparks and _____ produced by the arc welder
Ultraviolet rays
When compressed gas cylinders empty close the valve and what?
Mark the cylinders empty
Always wear eye protection when welding, never look at the arc without proper eye protection, this will prevent injuries in what?
Arc flash
The most popular and widely used welding inspection technique is what?
Visual inspection
If a welder uses a different welding process or a welding procedure is altered drastically then…
Re qualification is required
In a welding shop you should assume that all metal and tool are ___
Hot
Before a welder can begin work on any job covered by a welding code, qualification under the code that applies is …
Required
In all welding the weld pool must be protected by contamination in the atmosphere, in the welding process this is accomplished by either gases produced by the ______ on or in the electrode as it is consumed or by a shielding ___ into the arc
Coating, gas
One of the main functions of the electrode coatings is to ___
All the above
The rod angle should be directed so both pieces of metal are getting the same amount. It should be angled in direction of travel ___ to ___ degrees
10 to 15 degrees
The separation at the joint between two work pieces is called the ___ opening
Root opening
The GMAW process requires a constant voltage power supply and utilizes DC electrode ____
Positive
The push method on a wire feeder moves the wire by
Pushing the wire
To help with electrical pickup and protect the wire from oxidation, steel wires are coated with
Copper
If spatter buildup is not removed from the nozzle in MIG welding it can reduce the ___ shield over the weld meant
Gas
To avoid undercutting the sides of a flat position in a MiG weld it may be necessary to __ on the sides
Pause
Welding should not be performed when the ambient temperature is below what degrees
0 degrees
In MIG welding the electrode wire from the wire spool is driven the cable gun by a
Wire feeder
One of the disadvantages of flux core arc welding is that it requires the ___ removal and __ cleaning
Slag, weld
The TIG welder must posses good manual dexterity as well as manually controlling a variety of variables during welding, some of these are…
All the above
Reverse polarity is not generally used in TIG because it will ___ the tungsten electrode
Melt
The inert gasses most commonly used in TIG welding are argon and ___
Helium
By letting up on but not completely the foot pedal on TIG welding foot control the amperage will ___
Decrease
Preheating is the application of heat to the base metal immediately ___ welding, brazing, soldering …
Before
In the flux core arc welding process the shielding of the weld is provided by the flux …
Contained within the tubular electrode
The proper selection of filler metals for a specific application depends on identification of the ___ ___
Base metal
When TIG welding heavier materials, ___ amperage is required
Higher
Air carbon arc cutting process is commonly used in ___ and ___ metals
Cutting and gouging
Identify 8 ways to control distortion
- Clamps
- Weld both sides
- Minimize heat with amps
- Use large electrode diameter
- Don’t over weld
- Don’t allow overheat in one area
- Use stitch method
- Weld in same direction
Electrodes
E6010
ER70s-6
ER316L
E71t-7
