Welding Principles
Phosphorus
AWS restricts the level of sulfur and __ in GMAW electrodes due to undesirable welds and cracking
DCEP
welding with GMAW utilizes the polarity __
Electrical
when troubleshooting a GMAW System categorize the problem into one of three groups: wire delivery, gas delivery, or __
Cold lap
A common problem with GMAW-S is __
Shielding Gas
A gas-shielding gun assembly has multiple O-rings, if these O-rings become damaged or missing it will cause loss of __
Defect
A weld flaw significant enough to render the weld reject able is a __
tensile strength
Ability to resist forces attempting to pull it apart or stretch it is called__
70,000
An E71T-X FCAW electrode will have a minimum of __ psi tensile strength
Portability
An advantage to using FCAW-S versus FCAW-G is__
Minimal Spatter
An advantage to using a FCAW-G electrode is __
Helium
Argon and __ are classified as inert shielding gases
Deeper, Broader
Carbon dioxide produces a penetration profile that is __ and __ that of an argon blended shielding gas
2500
Cylinders are under extreme pressure at approximately __ psi
Additional shielding gas
FCAW-S electrodes do not require
Constant Voltage
For FCAW power sources, the output characteristics fall into two main categories m: constant current(CC) and __
A5.00
For Gas shielded arc welding the AWS specification for carbon shell filler metals is __
DCEP (direct-current electrode-positive)
Gas-shielded electrodes use __ polarity to ensure proper fusion
Magnesium
Higher silicon and __ deoxidizer level enhances toe wetting and finished weld bead appearance
Convexity of the bead
If arc voltage, WFS AND CTWD are held constant, too fast travel speed increases __
Increase Current
If arc voltage, wire feed speed, and travel speed are held constant, decreasing the CTWD will __
Replaced
If the protective insulation of the cable is damaged, and the cable is exposed, it needs to be__
Wider
In the FCAW process as voltage increase, arc length gets longer resulting in the arc cone being__
All the above - cost less, feed better, carry more circuit
Larger diameter electrodes usually
load cycle
Load range and __ are the two basic components of fatigue on a weld
All of the above - Type of welding, Level of current required, Use of compressed shielding gas
Proper FCAW gun selection depends on which factors?
ER70S-6
The classification of the electrode that contains the highest levels of silicon is __
Unplug or lockout/ragout machine
The first step in cleaning the power source is to __
CTWD
The four major welding variables with both FCAW-S and FCAW-G are arc voltage, wire feed speed, travel speed, and __
Usability Characteristics
The last digit of the FCAW electrode classification system indicates the __
tensile strength
The main difference between an E81T-X electrode and an E71T-X electrode is __
75% Argon 25% Carbon Dioxide
The most common type of mixed shielding gases used with FCAW-G in North America is __
Range of motion
The welders ability to weld a long distance and maintain comfort refers to __
All the way
To provide a proper seal, double-seat seal cylinder valves must be opened __
Nickel
To provide corrosion resistance on weatherboard steel when welding requires the electrode to contain 1% __
Atmospheric contamination
Weld shielding provides protection of the arc stream and prevents __
As close
When welding make sure the work cable is connected __ to the part being welded
Short circuit
__ Mode of metal transfer is capable of root pass work on pipe and has all weld position capability
Globular Transfer
__ Mode of metal transfer typically begins at 125 A and uses a continuously fed solid or metal cored wire electrode depositing in a combination of short circuit and gravity assisted large drops
Potassium, sodium
__ and __ are alloying elements added to the FCAW electrodes to stabilize the arc
Axial Spary
__ mode of metal transfer creates an excellent finish weld bead appearance and has the highest operator appeal
