Welding is a joining process that by definition requires the application of:
both heat and pressure
either heat or pressure
both heat and filler metal
both pressure and filler metal
all of the above
In arc welding, the electric arc is intensely hot with temperatures exceeding:
20,000 Degrees C
30,000 Degrees C
33,000 Degrees C
40,000 Degrees C
50,000 Degrees C
The most common gas used with gas shielded flux cored arc welding is:
Pure argon
Pure helium
75% Ar-25% CO2
Argon with 10% Hydrogen
The technique used for semi-automatic welding with gas shielded flux cored arc welding is:
Drag (backhand)
Push (forehand)
Welding equipment for gas shielded flux cored arc welding is essentially the same as for gas metal arc welding.
Gas shielded flux cored wires with basic ingredients in the core are ideally suited for out-of-position welding
Constant voltage power source are preferred for SMAW
Large diameter electrodes are preferred for welding the root passes in V grooves and for out-of-position welds
Constant voltage power source are generally used for GMAW.
In the submerged arc welding process, granular flux is placed on the unleaded seam behind the consumable electrode.
Fused fluxes are prone to moisture pick up
The source of heat in the resistance welding process is:
An electric arc
External pressure
Resistance of the copper electrode to electron flow
Electrical resistance of the workpieces
Which of the following arc welding processes is non-consumable electrode type?
GTAW
SMAW
GMAW
FCAW
SAW
PAW
The electron beam welding process results in:
wide, deep-penetrating welds and heat-affected zones.
narrow, deep-penetrating welds and heat-affected zones.
Narrow, shallow-penetrating welds and heat-affected zones.
wide, shallow-penetrating welds and heat-affected zones.
In thermite welding, the reaction from which the required heat and molten metal is obtained is called:
Exothermic
Duo thermic
Interthermic
endothermic
In electroslag welding, the usual cooling medium used on the copper shoes is:
Dry ice
Air
Oil
Water
A welding arc consist of a:
Low current and a high voltage
High current and a low voltage
High current and a high voltage
Low current and a low voltage
The heat of the welding arc is used to:
Locally melt the base material and filler material to create fusion upon solidification
Heat the base material and melt the filler material to form a surface bond between the two materials
Heat the materials to be jointed before the application of pressure
Promote a metallurgical reaction resulting in the bonding of the adjoining materials
Welding using the GTAW process with current set to DCEN (Direct Current Electrode Negative) results in:
30% arc heat at the electrode and 70% arc heat at the work.
70% arc heat at the electrode and 30% arc heat at the work
40% arc heat at the electrode and 60% arc heat at the work
60% arc heat at the electrode and 40% arc heat tat the work
The function of the ingredients in the electrode coating of SMAW electrodes is to:
Provide a gas shield, slag covering, scavengers, arc stabilization and additional alloying elements.
React with the base metal to assist in the weld fusion
Remove rust, mill scale and other contaminants from the surface of the joint.
Counteract the effects of arc blow.
The temperature for holding low-hydrogen electrodes is:
30 Degrees C
90 Degrees C
120 Degrees C
430 Degrees C
The GMAW Process uses _______________ To shield the molten weld metal from the atmosphere:
A slag system
External shielding gas
A blanket of flux
a vacuum chamber
Flux cored arc welding is a welding process usually used in the semi-automatic mode consisting of:
A constant current power supply, a continuos wire feeder, a welding gun, and a continuos solid filler metal electrode
A constant voltage power supply, a continuos speed wire feeder, a welding gun, and a continuos filler metal electrode with a hollow core containing flux and other ingredients
A constant current power supply, a variable speed wire feeder, a welding gun, and a continuos filler metal electrode with a hollow core containing flux and other ingredients
A constant voltage power supply, a continuos speed wire feeder, a welding gun, and a continuos filler metal electrode with a hollow core containing primarily metal powder
For a flat weld profile and good penetration profile using the metal cored arc welding process (MCAW), a travel angle of:
20 Degrees using a drag technique should be used
10 Degrees using a drag technique should be used
15 Degrees using a push technique should be used
30 Degrees using a push technique should be used
SAW fluxes:
Are classified, each with its own separate designation
Are not classified. Only the wire is classified
Are classified in conjunction with the welding wire forming a flux-wire designation
Are all classified with EM12K wire. Used with other wires would require companies to perform testing to verify desired properties
A major advantage of the electron beam welding process is:
Low equipment cost and ease of use
High speed welding of thin materials
Fit-up of joints does not have to be precise
Full penetration welds on thick materials in one pass
