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WorksheetsWelding Inspection_01
Total questions: 59
Worksheet time: 30mins
Chromium molybdenum steels for high temperature service typically have their carbon content below 0.2% What other element is added to the steel to create a stable steel at elevated temperatures ?
Vanadium
Selenium
Sulphur
Nickel
Which of the following could be used to prevent intercrystalline corrosion in Austenitic Stainless steel ?
Vanadium
Selenium
Sulphur
Niobium
Which of the following metals is most easily to be welded ?
High strength steel
Stainless steel
Medium carbon steel
Mild steel
Hydrogen trapped in the weldment can cause hydrogen cracking if the content of hydrogen is too high. What is the other name commonly used to describe hydrogen cracking ?
Hot tears
Liquation cracking
Reheat cracking
Delay cracking
Which of the following is not a pattern that the atoms of steel arrange themselves in?
Body centered cubic
Body centered tetragonal
Face centered cubic
Diomond centered cubic
A hard and brittle microstructure in a low alloy steel can be improve its properties to soft and ductile by :
Increasing the heat input during welding
Must follow by post heating after welding
Hardening
Annealing
What happen to the properties of the steel when the carbon is increased to 0.6% ?
Ductility increases
Weldability increase
Malleability in increase
Tensile strength increases
What is the affect will occur to a carbon manganese steel if the steel has been rapid cooled from austenite region?
It becomes ductile
The toughness increases
Its hardness increases
Its yield strength decreases
Which of the following statements is true with regards to hydrogen cracking ?
It is because of rapid cooling of weld metal and others factor
It is a hot type of crack
It only occur in the HAZ
Ductile grain structure is the most susceptible to hydrogen cracking
The are energy during a welding process :
Does not effect the toughness of weldment
Must be high in order to avoid lack of fusion
Affects the width of HAZ
All of true
In a martensitic grain structure what would you not expect to increase ?
Strength
Hardness
Toughness
All of the above
Nitrogen and oxygen are considered to be important elements during the steel making process :
cause sulphur to isolate in the steel
cause imperfections if not removed in sufficient quantities
improve the quality of steel
Improve the surface appearance of the steel
Sulphur is added to steel to improve :
Strength
Hardness
Toughness
Machine characteristic of the steel
Oxygen and sulphur in steels for a non metallic inclusion during the rolling process and can lead to what after welding :
Sulphide precipitation
Oxygen rich welds
Lamellar tearing
Stress corrosion
Alloying elements other than carbon can give significance raise of hardness of a steel, one of these is :
Manganese
Silicon
Aluminium
Sulphur
When weave technique the heat input using the same welding parameters (amps and voltage) as those used for stringer bead will be :
Be the same as that for the stringer bead
Lower than that for the stringer bead
Will be higher than the stringer bead
Unaffected because technique has no influence on the heat input
Heat treating will :
improve the yield strength of the steel only
increase the elongation of the steel only
alter the chemical composition of the steel
not improve the properties of steel as a whole
The region of HAZ that gets heated to a temperature between 700 c and 900 c is called :
wide band HAZ
Tempered HAZ
Spherodised HA
Intercritical HAZ
The fully transformed HAZ located next to the fusion boundary in a weldment is the area :
Where cracking does not occur
Where cold cracks will not occur
With lowest tendency to form cold cracks
With the highest tendency to cold cracks
Martensite is a hard phase in steel and highly dependent on its properties from the amount of carbon trapped in the Body Centered Cubic atom arrangement.
When carbon is trapped in this atom arrangement to cause the :
Carbon dissolves in this iron
Carbon atoms cause the BCC shape to distort resulting in increased hardness
Iron transforms to pig iron
Carbon separates out to form isolated island martensite
Slowly cooled of mild carbon steels have a microstructure with :
High tensile strength
Lowest strength and the highest ductility
Highest strength with lowest toughness
Brittle structure
The ability of the alloy steel to form martensite can be determined by its :
iron carbon diagram
equilibrium diagram
Carbon equivalent value
Transition curve diagram
The formation of hard and brittle grain structure in alloy steel can be controlled by : |
Used of low arc energy
Increase the material thickness
Pre heating the material to welding
All of true
The cooling rates of weldment is very critical where it can gives a formation of martensite or Bainite. What factors that will influence the cooling rates?
Type of consumables and materials
Size of electrodes and welding position
Thickness, material size and thermal conductivity
All of true
The main factors likely to cause lamellar tearing are thus :
Materials with lamination
Materials with greater thickness
Materials with high thermal conductivity
Low, short transverse ductility material
The combination of iron and sulphur during welding will promotes :
Globular form of microstructure along the grain boundaries
Higher strength of the centre of weld metal
Low melting point along the grain boundaries
Higher hardness of weld metal compared to HAZ
The purpose of through thickness test is to determine :
the susceptibility of materials to hot cracking
the strength of through thickness of materials
the amount of energy absorb and toughness of materials
susceptibility of steel plate to lamellar tearing
Which following factor does not contribute to the formation of solidification cracking :
High dilution welding process
Low travel speed applied during welding
High sulphur materials
Fast travel speed
Which of the following statement is correct for multi run welding compare to single passed welding :
High productivity can be produced with multi run
Higher distortion with multirun compare to single run
Higher energy absorbed and higher toughness with multirun
Multi run welding less cracking to occur
What alloying element that may helps on controlling of intercrystaline corrosion in austenitic stainless steel :
Molybdenum
Vanadium
Columbium (Niobium)
Cooper
What is the Arc energy for the following welding process parameters ?
Amps 140, Volts 21, Travel speed 250mm/min
0.7 Kj/mm
0.6 Kj/mm
0.01 Kj/mm
0.7 J/mm
What is the effect of tempering after quenching :
Toughness and strength are increase
Toughness and strength are reduced
Toughness increased and strength reduced
Toughness increased and hardness increase
What is the ratio between the leg length and the design throat thickness on a mitre fillet weid with equal leg lengths :
1 to 1
2 to 1
1.414 to 1
All of the above it depends upon the leg length size
The toughness and yield strength of steel is reduced by :
A. Reducing the grain size
B. Increasing the heat input
C. Reducing the heat input
Both A and B
Which of the following statements is true if applicable to a charpy vee notch impact test :
It's a destructive test used to assess materials ductility in the weld zone
It's a mechanical test used to determine a welds resistance to creep
t's a dynamic test, which is used to give a measure of notch toughness
It's a static test used to determine materials toughness in the notch region
How can you tell the difference between an EN/ISO weld symbol and a BS weld symbol ?
The EN/ISO weld symbol! will always have the arrow side weld at the top of the reference line :
The EN/ISO symbol has the welds elementary symbol placed on a dashed line lying above or below the solid reference line to indicate a weld on the other side
The EN/ISO symboi has a fillet weld leg length identified by the letter “a”
The EN/ISO symbol has a fillet weld throat thickness identified by the letter “z"
What is the possible effect of having the heat input too low during welding ?
Low toughness, entrapped hydrogen and low hardness
High hardness, lack of fusion and entrapped hydrogen
Entrapped hydrogen, low toughness and high ductility
Lack of fusion, low toughness and a reduction in ductility
An MMA electrode classified as E7018 is :
A basic low hydrogen electrode containing iron powder
A rutile electrode containing iron powder
A cellulose electrode suitable for welding in all positions
basic electrode depositing weld metal with yield strength of a least 70,000 psi
The number 135 is placed at the end of the reference line on a weld symbol. According to ISO 2553 what does this number indicate ?
The welding process is stated as MMA
The welding process is stated as TIG
The welding process is stated as SAW
NDT is to be carried out after welding
None of the above
Which of the following is the most likely to be considered an essential variable for a welder qualification test ?
A change from an electrode classified to BS EN 499 as an E46 3 INI B to an electrode classified to AWS A5.1 as an E7018.
A change of pipe wall thickness by at least 15 mm
A change in pre-heat temperature from 50°C to 100°C
A change from PC welding position to PA welding position
What would be a typical appearance of a ductile fracture surface ?
Rough randomly torn and a reduction in area
Smooth fracture surface displaying beach marks
Step like appearance
Bright crystalline fracture with very little reduction in area
In EN 499, what does the number 50 represent in the following electrode classification? E50 3 1Ni B 160 0 1 H5
A minimum of 50 N/mm2 yield strength
A minimum of 500 N/mm2 tensile strength
A minimum of 50000 psi yield strength
A minimum of 50000 psi tensile strength
None of the above
Increasing the carbon content of a steel will :
Increase the hardness and toughness
Decrease the hardness and toughness
Increase hardness, decrease toughness
Decrease hardness, increase toughness
Which of the following is applicable for the HAZ on a C/Mn Steel weld if the heat input increases :
Both hardness and width is increased
Hardness decreases, width increases
Both hardness and width decreases
Hardness increases, width decreases
What is the main reason for the application of pre-heat :
To change the chemical composition of the weld and parent material
The control the hydrogen and prevent cracking
To remove residual stresses
All of the above
Which of the following is most likely to increase the chance of solidification cracking ?
Reduction in sulphur content of the parent material
Increased restraint on the joint during welding
Increase in weld hydrogen content from 15 mi/100 g to 25 m/i100 g
Poor through thickness ductility in the materials being welded
What is the effect of full annealing compared to normalizing ?
A reduction in grain size.
An increase in grain size
An increase in toughness
The grain size will not be affected
Which of the following elements may cause cold shortness :
Sulphur
Phosphorous
Manganese
Silicon
When considering the advantages of site radiography over ultrasonic inspection which of the following applies ?
A permanent record produced, good for detecting lack of sidewall fusion in a single U butt weld and defect identification
A permanent record produced, good for the detection of all surface and sub-surface defects and assessing the through thickness depths of defects
Permanent record produced, good for defect identification and not as reliant upon surface preparation
No controlled areas required on site, a permanent record produced and good for assessing pipe wall thickness reductions due to internal corrosion
Which of the following materials are the most susceptible to HICC in the weld zone :
A. Carbon Manganese steel
B. Micro alloyed steel (HSLA)
C. Austenitic steel
Both A and B
Lamellar tearing is :
A product defect caused during the manufacturing of certain steels
A crack type, which occurs in the parent material due to welding strains acting in the short transverse direction of the parent material
A type of hot crack associated with impurities (sulphur, carbon and phosphorous)
A type of crack that occurs in the weld or parent material due to cyclic stresses
Which of the following statement maybe considered correct when dealing with agglomerated fluxes ?
1. Easy addition of additive
2. They're less hygroscopic than other types
3. Flaky appearance
4. Need to bake, prior to their use .-
5. Less dust tendency
A. Statements 1 & 4 are correct
B. Answer 1 and 3 are correct
C. Answer 4 and 5 are correct
D. Statements 1, 2,4 and 5 are correct
Which of the following is applicable to the heat treatment process of normalising carbon-manganese steel :
It is always carried out below the lower critical limit
It is carried out to ensure the material has maximum tensile strength
It is carried out to ensure the material is of maximum ductility and malleability in preparation for extensive cold working operations
It is carried out at approximately 910°C for the purpose of grain refinement
Austenitic stainless steel can be identified by :
Very shiny appearance
Lack of magnetic attraction
Its extreme hardness
None of the abov
Ultrasonic testing is preferable to radiographic testing due to :
its ability to detect all defect
Lower amount of operator skill required
Its ability to detect laminations
Its ability to detect both sub-surface and surface defects in Austenitic stainless
Which of the following flame types would you expect to be used for the cutting of mild steel ?
Carburising flame
Oxidising flame
Reducing flam
Neutral flame
The heat affected zone of a carbon steel fusion weld :
Usually has the highest tensile strength and highest toughness values
Usually has the lowest toughness values and cannot be avoided
Is usually gamma iron phase and cannot be avoided
All of the above
A welding process where the welding plant controls the travel speed and the arc gap. but under constant supervision using a shielding gas mixture of 80% argon ~ 20% carbon dioxide is termed :
A manual MAG proces
A semi-automatic MAG proces
A mechanised MIG proces
A mechanised MAG process
The main reason for toe blending on certain welded components is :
Corrosion considerations
Fatigue life
Appearance
All of the above
