Week 1 Flashcards
A separation at the joint root between the work pieces
Root opening
What are they four welding testing positions?
One G flat position 2G horizontal position 3G vertical position and 4G overhead position
A.W.S. Stands for
American welding Society
The ratio of arc time to total time is called
A duty cycle
A coded electrode for SMAW that has 60 K psi tensile strength can be welded in any position on carbon steel, and the zero means manufacture characteristics
E6010 electrode
This electrode is a solid wire that can be used as a filler rod in GMAW and GTAW due to ER designation, it has a 70 K psi tensile strength, the six is wire chemistry
ER70s-6
A 316 stainless steel electrode rod on stainless steel wire that can be used as filler metal in GMAW or GTAW, the L means low carbon
ER316L
This electrode is a flux cord electrode that cannot be used as a filler metal, used in FCAW, the seven designates that it has 70 K psi tensile strength, the one means it can be welded in all positions, the T means tubular, and the seven identifies itself as shielded, use on carbon steel
E71T-7
Tungsten is used because it has two very important characteristics, which are
High melting, and excellent conductor
This is not used because it will melt the tungsten electrode
Reverse polarity
When tig welding heavier materials this is required
A higher amperage is required
Essentially welding is a safe occupation if proper precautionary measures are always
Observed
You must always wear blank when welding, cutting or grinding. Do not look at the arc without this.
Proper eye protection
This will prevent illness due to over exposure to hazardous materials in the fume plume
Avoiding breathing the air in the fume plume directly above the arc
This will prevent contamination from entering the cylinder
Closing the valve and marking the cylinder empty when compressed gas cylinders are empty
An energized holder can arc to a grounded cylinder in cause an explosion that is why when it is not use, you must
Hang it on the brackets provided and never let it touch a compressed gas cylinder
Ultraviolet Arkray can cause arc flash to the eyes of nearby people when welding you must
Shield others from the light raise produced by your welding arc
One way to fix undercutting in your welding in MIG
To pause at each side of the weld bead when using a weaving technique
Some slang terms for shielded, metal arc welding or SMAW is
Stick welding or stick electrode welding
While shielded metal arc welding with direct current, you can use two types of electrodes
Electronegative DCEN – straight polarity or electrode positive DCEP – reverse polarity
An electric arc process that produces coalescence of metals by heating them with an arc between a continuous filler metal electrode, and the work piece, shielding is obtained entirely from an external supplied gas
This is gas metal arc welding GMAW
What type of current electrode is normally used with GMAW
Direct current electrode positive
This drives the electrode wire from the wire spool through the cable and gun to the welding arc
The wire feeder
The push system in a GMAW is designed so that the wire feed rolls are near
The wire supply and the wire is pushed through the wire conduit to the welding, gun or torch
This displays the air around the arc to prevent contamination of the molten pool by oxygen and nitrogen in the atmosphere in GMAW systems
The shielding gas system
Steel wires normally have a thin copper coating to
Improve electrical pick up and protect the wire from oxidation
Flux cord arc welding, or FCAW shielding is provided by
A flux contained within the tubular electrode
True or false flux cord arc welding can only be used with DCEP and DCEN
True or both
An ark welding process that produces coalescence of metals by heating them with an arc between a tungsten electrode nonconsumable, and the work pieces shielding is obtained from a gas
This is gas, tungsten arc welding, or GTAW
With a high degree of welding skill, the welder controls the torch with one hand and feeds filler metal with the other for GTA W this application is known as
The manual method
A foot pedal for GTA W controls current letting up, but not completely has this effect
Decreases current
What type of current is used to weld aluminum?
Alternating current
The two most commonly used shielding gases
Argon and helium
This is a cutting process that cuts anything that conducts heat, and or electric electricity
Thermal cutting
This type of cutting is popular process for cutting metal gouging out defects, removing poor welds back gouging route passes and preparing joint edges
This is air carbon arc cutting
For proper selection of the filler metal for a specific application what is required
Identification of the base metal
Base metal should be preheated at least to this temperature when welding and should not weld when the base temperature is below this degrees
70° and 0
If a welder uses a different process or if the welding procedure is altered drastically, this is required
Requalification
This type of inspection is the most widely used in most popular welding inspection technique
Visual welding inspection
This means reverse polarity
DCEP
This means the electrode is negative
DCSP, which also stands for direct current straight polarity
This uses a tungsten electrode
GTAW
Eight ways to control distortion are
To use Thai bar braces to restrain movement, do not let weldment overheat in isolated area, use a limited number of weld passes by using large electrodes, do not overwhelmed, use back step, welding technique, use minimum amount of bevel angle, and root gap opening,prepare slight gap between the members to be joined to allow for some expansion, and always weld in the same direction
A root pass is also known as
The first pass
One of the most common gases for me welding is
75% argon and 25% carbon dioxide
Do not look at the ark without proper eye protection this will prevent eye injuries and
Arc flash
True or false breathing in the air of the fume flume directly above the arc will will cause illness due to over exposure of hazardous materials
True
True or false Ferris and non-Ferris metals can be cut with plasma arcs
True
When walking into a weld shop, you must assume
All work and work tools are hot
