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CWB Module 4 Welding Processes and equipment QUESTIONS AND ANSWERS RATED A+ 2024/2025
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CWB Module 4 Welding Processes and equipment QUESTIONS AND ANSWERS RATED A+ 2024/2025
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CWB Module 4 Welding Processes andequipment
Active Flux - ANSsignificantly have an effect on the weld puddle
- add manganese, silicon, chromium to weld metal
- commonly bonded kind flux
Arc Blow - ANSThe deflection of an arc from its regular course because of magnetic forces.
Autogeneous Weld - ANSA fusion Weld made with out filler metal
Duty Cycle - ANSThe time at some stage in a 10-minute test period, expressed in percentage,
that a power source can perform at the rated output with out overheating
Fused Flux - ANSA granular flux produced by way of blending the elements, observed with the
aid of melting, cooling to the stable state and processing to supply the preferred particle length
Heat Affected Zone (HAZ) - ANSThe part of the base metal adjacent to a weld which has not
been melted, however the metallurgical microstructure and mechanical residences have been
modified through the warmth of welding, once in a while with unwanted effects.
Neutral Flux - ANSmake minimum changes to the weld pool composition
Non Consumable Electrode - ANSAn electrode that does not provide filler metallic
What are the 8 classes that welding procedures are grouped as? - ANSArc Welding (AW)
Solid State Welding (SSW)
Resistance Welding (RW)
Oxyfuel Gas Welding (OFW)
Soldering (S)
Brazing (B)
Other Wleding
Allied Processes (ie slicing & Thermal Spraying)
What are the two foremost techniques of Arc Shielding? - ANSFlux Shielding
Gas Shielding
What direction do electrons drift? - ANSNegative to Positive
What Temperature is a welding arc? - ANSexceeding 30,000°C
,Resistance Welding (RW) - ANSA kind of welding wherein welding occurs from the heat
received by means of resistance to the drift of modern-day through the joined metals.
Anode - ANSPositively charged electrode
Cathode - ANSNegatively charged electrode
Arc Efficiency - ANSthe portion of the power that is to be had to soften the electrode/filler metal
and the work piece
Direct Current - ANSan electric powered present day flowing in a single course handiest.
Alternating Current (AC) - ANSelectric present day that reverses its path of go with the flow in a
everyday pattern
Resistance heating - ANSAs present day flows via a conductor, heat is produced via the
resistance of the conductor. Conductor Length Increases Resistance. As Diameter Decreases
so does resistance.
Where beside the heating of consumables is the Arc Energy used up? - ANSConduction,
Convection, Radiation, Spatter, and so on
What is the Arc Efficiency of SAW? - ANS90% - ninety five%
What is the Arc Efficiency of SMAW, GMAW, FCAW? - ANS65% - 85%
What is the Arc Efficiency of GTAW? - ANS20% - 45%
What does a Transformer do? - ANSturns High Voltage, Low Amp Power into High Amp, Low
Volt Power
What causes the voltage drop over the electrode extension? - ANSLonger electrode extension,
smaller twine diameter and better current
What is Arc Length associated with? - ANSarc voltage
How does cable length impact the voltage? - ANSThe longer the cables, the greater voltage
drop
What sort of default does Arc Blow reason? - ANSIncomplete fusion
What is electromagnet pinch force? - ANSHelps to detach the molten drops from the electrode
(Smaller drops as contemporary increases)
,What does present day and polarity have an impact on in a weld? - ANSThe shape of the weld
bead
What polarity is GTAW most customarily? - ANSDCEN
What is the benefit of DCEN in GTAW? - ANSgreater Penetration
What is the benefit of DCEP in GTAW? - ANSGood cleansing of the puddle & accelerated
electrode soften off charge
What protects the weld pool in GTAW? - ANSInert Gas - Argon or Helium
Inert Gas - ANSHas no chemical response with the arc or puddle
What are a few blessings to GTAW? - ANSHigh Quality Weld
Can be used on most metals and alloys
Requires no put up weld cleansing
Welds skinny material effortlessly
What are some negative aspects to GTAW? - ANSSpecial Equipment
Low disposition Rate
What are possible resources of Hydrogen in weld? - ANSElectrode masking, flux, protecting
gas, surroundings humidity and condensation
What need to be present to have bloodless cracking? - ANS- Requisite Microstructure,
- Stress,
- Critical Level of Hydrogen,
- Temperature (commonly underneath a hundred and fifty°C)
Partial Rectification? - ANSThe postpone in re-ignition of the arc as a result of switching from
DCEN to DCEP
What does a high cutting-edge do to the arc? - ANSStiffens the Arc
Ionization Potential (IP) - ANSthe energy it takes to put off an electron from an atom
Ionizing - ANSa method that modifications the electric fee of atoms
Advantages to Argon as a shielding gasoline - ANSSmoother and Quieter Arc
Better at lower heats, accurate for thin material
extra cleaning motion while using AC ie Alum
less difficult arc beginning
, lower waft quotes, and better wind resistance
lower fee and more availability
What sort of Power Output is SMAW? - ANSConstant Current
How is Voltage managed with SMAW? - ANSArc Length
What is the difference between a short and lengthy arc period? - ANSShort = deeper
penetration
Long = higher moist out
What are the functions of electrode coverings? - ANSprevent infection
offer slag cowl
do away with impurities
stabilize the arc
approach to feature alloying elements
What is the pleasant manner to save you Arc Blow? - ANSUse AC Power Sources
What are the advantages to the usage of DC Power? - ANSeasier arc initiation
better balance
potential to maintain a short arc
out of position welding
What is E4918-X? - ANSE=Electrode
49= tensile power
1=position (1=all, 2=Horiz Fillet & Flat, four=vert down)
eight=coating type
-X= non-compulsory improved sturdiness
What are the 3 Coating Type Classes? - ANSEXX10 & EXX11 = Cellulose
EXX12, EXX13, EXX14 = Titania
EXX15, EXX16, EXX18 = Basic
What form of electrodes are susceptible to moisture absorption? - ANSBasic
What is E308-16? - ANSE=Electrode
308=Alloy Type
1=Position
6=Flux Type
What is Deposition? - ANSthe quantity of weld deposited in a given time period. Amp's do the
melting.
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