WELDING YEAR 1: WELD THEORY FINAL EXAM
The composition if the base metal is the major factor to consider when selecting:
filler materials
Which organizations have written specifications for the wire feed filler metals?
AWS & CSA
When added to ER70S-2, silicon, aluminum and manganese are used as:
deoxidizers
Cast refers to:
circle formed by one wrap of the wire.
When the wires are packaged into sealed containers it is mainly to protect them from:
moisture and contamination
Improperly cleaned wires most often produce welds with:
porosity
Filler metals containing additional deoxidizers are intended for use on:
moderately rusty low-carbon steels
What does the G stand for in the CSA FCAW electrode classification E492T-G?
General purpose electrode for use on carbon and low alloy steels
In the GMAW short-circuiting transfer mode, metal is transferred:
When the electrode comes into contact with the weld pool
Very fine droplets of metal transferred across the arc in an axial fashion describes what mode of
metal transfer
spray
Which GMAW wire would be the best choice for welding thin metals?
Short circuiting arc transfer
A pull type welding gun is designed to be used with:
Soft wires
What type of wire drive system allows greater machine to work distances?
push-pull system
When using GMAW on mild steel, the most popular type of wire feed system is:
push system
In addition to maximizing operator comfort what is the purpose of the curved neck on a welding
gun?
It ensures proper electrical transfer to the wire electrode
The welding cable assembly is constructed to:
Supply current gas and wire to the welding gun
what is the main purpose of contact tube?
It transfers the welding current to the filler wire
Ideally, a welding power source should be located in:
an uncultured well ventilated area of the shop
It is important to have wire guides in alignment with drive rolls on the wire drive unit.
true
, To obtain an accurate reading from a flow meter it must be mounted in what position?
vertical
The wire spool hub should be adjusted in order to:
feed freely, yet prevent a backlash of wire when feeding is stopped
Changing the gun inclination:
Changes the penetration of the weld
Excessive splatter buildup in the gun nozzle can cause:
inadequate gas coverage
Moisture and dirt on the surface of the wire electrode is likely to cause
porosity
Excessive drag from a dirty liner is likely to cause
slippage or bird nesting at the drive rolls
When arc hunting occurs, the problem is likely in the:
Contact tip or the conduit liner
Stubbing is caused by excessive:
Wire feed speed
What is the major cause of cold lap when using the GMAW short circuit metal transfer?
Slow travel with a large bead
How often should you clean the conduit liner of a wire drive set up:
Every time the wire spool is changed
What part of the GMAW system requires the most ongoing maintenance?
Gun and cable assembly
What can result from poor work lead connection:
an unstable arc
What should you check for when adjusting from short circuiting to spray transfer with gnaw?
make sure the gun is rated to handle higher currents
What part of FCAW equipment requires the most ongoing maitenece?
the gun and cable assembly
What positions can SAW be used in?
flat and horizontal positions
what types of output slope do SAW power sources use?
cc and cv
What duty cycle rating is recommended for most SAW power sources?
100%
SAW may be used in the semi-sutomatic or automatic operation modes:
true
what is the advantage of using an ac power source for SAW:
it minimizes arc blow with multiple wire set-ups
What will usually result if the drive roll pressure is set too low?
The wire electrode will slip and feed erratically
how will the arc react if the flux layer is too shallow?
The weld will be flashing and will likely result in porosity
What is helix?
the space between two unrestrained loops of wire
The composition if the base metal is the major factor to consider when selecting:
filler materials
Which organizations have written specifications for the wire feed filler metals?
AWS & CSA
When added to ER70S-2, silicon, aluminum and manganese are used as:
deoxidizers
Cast refers to:
circle formed by one wrap of the wire.
When the wires are packaged into sealed containers it is mainly to protect them from:
moisture and contamination
Improperly cleaned wires most often produce welds with:
porosity
Filler metals containing additional deoxidizers are intended for use on:
moderately rusty low-carbon steels
What does the G stand for in the CSA FCAW electrode classification E492T-G?
General purpose electrode for use on carbon and low alloy steels
In the GMAW short-circuiting transfer mode, metal is transferred:
When the electrode comes into contact with the weld pool
Very fine droplets of metal transferred across the arc in an axial fashion describes what mode of
metal transfer
spray
Which GMAW wire would be the best choice for welding thin metals?
Short circuiting arc transfer
A pull type welding gun is designed to be used with:
Soft wires
What type of wire drive system allows greater machine to work distances?
push-pull system
When using GMAW on mild steel, the most popular type of wire feed system is:
push system
In addition to maximizing operator comfort what is the purpose of the curved neck on a welding
gun?
It ensures proper electrical transfer to the wire electrode
The welding cable assembly is constructed to:
Supply current gas and wire to the welding gun
what is the main purpose of contact tube?
It transfers the welding current to the filler wire
Ideally, a welding power source should be located in:
an uncultured well ventilated area of the shop
It is important to have wire guides in alignment with drive rolls on the wire drive unit.
true
, To obtain an accurate reading from a flow meter it must be mounted in what position?
vertical
The wire spool hub should be adjusted in order to:
feed freely, yet prevent a backlash of wire when feeding is stopped
Changing the gun inclination:
Changes the penetration of the weld
Excessive splatter buildup in the gun nozzle can cause:
inadequate gas coverage
Moisture and dirt on the surface of the wire electrode is likely to cause
porosity
Excessive drag from a dirty liner is likely to cause
slippage or bird nesting at the drive rolls
When arc hunting occurs, the problem is likely in the:
Contact tip or the conduit liner
Stubbing is caused by excessive:
Wire feed speed
What is the major cause of cold lap when using the GMAW short circuit metal transfer?
Slow travel with a large bead
How often should you clean the conduit liner of a wire drive set up:
Every time the wire spool is changed
What part of the GMAW system requires the most ongoing maintenance?
Gun and cable assembly
What can result from poor work lead connection:
an unstable arc
What should you check for when adjusting from short circuiting to spray transfer with gnaw?
make sure the gun is rated to handle higher currents
What part of FCAW equipment requires the most ongoing maitenece?
the gun and cable assembly
What positions can SAW be used in?
flat and horizontal positions
what types of output slope do SAW power sources use?
cc and cv
What duty cycle rating is recommended for most SAW power sources?
100%
SAW may be used in the semi-sutomatic or automatic operation modes:
true
what is the advantage of using an ac power source for SAW:
it minimizes arc blow with multiple wire set-ups
What will usually result if the drive roll pressure is set too low?
The wire electrode will slip and feed erratically
how will the arc react if the flux layer is too shallow?
The weld will be flashing and will likely result in porosity
What is helix?
the space between two unrestrained loops of wire
