Ramsay Test Welding and Metal Working 1 — Questions and Answers

Question 1: What does SMAW stand for, and what is the common name for this welding process?

Shielded Metal Arc Welding; commonly called 'stick' welding (Correct answer)
Submerged Metal Arc Welding; commonly called 'buried' welding
Shielded Mig Arc Welding; commonly called 'wire' welding
Standard Metal Arc Welding; the basic arc process

Correct answer: Shielded Metal Arc Welding; commonly called 'stick' welding

SMAW (Shielded Metal Arc Welding) uses a consumable flux-coated electrode ('stick') to create an arc. The flux coating creates a shielding gas and slag to protect the weld pool from atmospheric contamination.

Question 2: What is the purpose of a welding preheat when welding medium to high carbon steel?

To reduce the cooling rate, preventing hydrogen cracking and hardening of the heat-affected zone (Correct answer)
To increase welding speed and productivity
To remove mill scale from the base metal
To improve electrical conductivity of the base metal

Correct answer: To reduce the cooling rate, preventing hydrogen cracking and hardening of the heat-affected zone

Preheat slows the cooling rate of the weld and heat-affected zone (HAZ), reducing thermal shock, preventing hydrogen cracking (delayed cracking), and minimizing hardening in higher-carbon steels.

Question 3: In MIG (GMAW) welding, what is the purpose of the shielding gas?

To protect the molten weld pool from atmospheric oxygen, nitrogen, and hydrogen contamination (Correct answer)
To cool the weld wire to prevent it from melting too fast
To flux the base metal surface for better adhesion
To ionize the air for better arc stability only

Correct answer: To protect the molten weld pool from atmospheric oxygen, nitrogen, and hydrogen contamination

Shielding gas (typically CO2, Argon/CO2 mixtures, or pure Argon for aluminum) blankets the weld pool, preventing atmospheric gases from contaminating the weld. Contamination causes porosity, cracking, and poor weld quality.

Question 4: What type of welding defect is caused by insufficient fusion between the weld metal and base metal?

Lack of fusion (incomplete fusion) (Correct answer)
Porosity
Undercut
Overlap

Correct answer: Lack of fusion (incomplete fusion)

Lack of fusion (LOF) occurs when the weld metal and base metal (or weld passes) fail to fuse together. Causes include too low heat input, incorrect electrode angle, or contaminated surfaces. It creates a significant structural weakness.

Question 5: What is the Rockwell hardness test measuring when it assigns an HRC value?

The resistance of a material to permanent indentation using a diamond cone (Brinell scale C) (Correct answer)
The energy required to fracture the material
The tensile strength of the material in ksi
The material's resistance to scratching

Correct answer: The resistance of a material to permanent indentation using a diamond cone (Brinell scale C)

Rockwell C (HRC) hardness uses a diamond cone (Brale) indenter under 150 kgf total load. It measures indentation depth — shallower depth = higher hardness number. Used for hardened steels (typically HRC 20-70).

Question 6: What does 'heat-affected zone' (HAZ) refer to in welding?

The area of base metal adjacent to the weld that has been altered by welding heat without melting (Correct answer)
The weld metal itself after cooling
The zone inside the welding machine that heats the wire
The area of base metal melted and fused with the filler metal

Correct answer: The area of base metal adjacent to the weld that has been altered by welding heat without melting

The HAZ is the region of base metal next to the weld that was heated enough to alter its microstructure and mechanical properties but not enough to melt. It can become hardened, softened, or embrittled depending on the material.

Question 7: What is the primary purpose of TIG (GTAW) welding and when is it preferred over MIG?

Precise, high-quality welds on thin materials and exotic alloys; preferred when weld quality requirements are highest (Correct answer)
High-speed production welding of thick structural steel
Welding in all positions without skill requirements
Welding only non-ferrous metals in flat position

Correct answer: Precise, high-quality welds on thin materials and exotic alloys; preferred when weld quality requirements are highest

TIG/GTAW uses a non-consumable tungsten electrode and inert gas shielding. It offers precise heat control and produces clean, high-quality welds. Preferred for stainless steel, aluminum, titanium, thin materials, and precision applications.

Question 8: When reading a weld symbol, what does the number to the LEFT of the weld symbol indicate?

The length of the weld (Correct answer)
The size (throat or leg) of the weld
The number of weld passes required
The electrode diameter

Correct answer: The length of the weld

In AWS weld symbols, the number to the LEFT of the symbol indicates weld size (for fillet welds, the leg size; for groove welds, the depth of preparation). The number to the RIGHT indicates weld length.

Question 9: What is porosity in a weld, and what commonly causes it?

Gas pockets trapped in the solidified weld metal; caused by contamination (moisture, rust, oil) or shielding gas loss (Correct answer)
Incomplete fusion between weld passes
Surface cracks on the weld bead
Slag inclusions from flux

Correct answer: Gas pockets trapped in the solidified weld metal; caused by contamination (moisture, rust, oil) or shielding gas loss

Porosity is gas (typically hydrogen or CO) trapped in the weld as bubbles when the weld solidifies. Causes include moisture on base metal or electrode, inadequate shielding, contamination, or excessive welding speed.

Question 10: What is the purpose of annealing a metal?

To soften the metal, relieve internal stresses, and improve ductility by heating and slow cooling (Correct answer)
To harden the metal by rapid quenching
To increase surface hardness through carburization
To clean the metal surface by heating

Correct answer: To soften the metal, relieve internal stresses, and improve ductility by heating and slow cooling

Annealing involves heating metal to a specific temperature and cooling it slowly (in the furnace or in still air). This relieves residual stresses, softens the metal for machining or forming, and restores ductility.

Question 11: In sheet metal work, what does a 'bend allowance' refer to?

The extra length of material needed to form a bend without distorting the flat pattern dimensions (Correct answer)
The maximum load a bent part can carry
The gap between bent pieces in an assembly
The spring-back compensation after bending

Correct answer: The extra length of material needed to form a bend without distorting the flat pattern dimensions

Bend allowance (BA) is the arc length of material consumed in forming the bend. When calculating the flat blank size from a bent part, the bend allowance is added for each bend to account for the material that forms the curved zone.

Question 12: What does 'undercut' describe as a welding defect?

A groove melted into the base metal along the weld toe that is not filled by weld metal (Correct answer)
Weld metal deposited below the base metal surface
Excess weld metal protruding above the base metal
A weld that is too narrow for the joint thickness

Correct answer: A groove melted into the base metal along the weld toe that is not filled by weld metal

Undercut is a groove or channel melted into the base metal at the weld toe that remains unfilled. It reduces the effective cross-section of the base metal and creates a stress concentration point. Caused by excessive current, speed, or wrong angle.

Question 13: What is the purpose of quench and temper heat treatment for steel?

Quenching creates a hard but brittle martensite structure; tempering reduces brittleness while retaining useful hardness (Correct answer)
Quenching softens the steel; tempering hardens it
Both steps are done to soften the steel completely
Quenching removes carbon; tempering adds carbon

Correct answer: Quenching creates a hard but brittle martensite structure; tempering reduces brittleness while retaining useful hardness

Quenching (rapid cooling from austenitizing temperature) creates martensite, which is very hard but brittle. Tempering (reheating to a lower temperature) converts some martensite to tempered martensite, reducing brittleness and improving toughness.

Question 14: What type of cut does an oxy-fuel cutting torch make, and why can't it cut stainless steel the same way?

It burns (oxidizes) the iron; stainless steel's chromium oxide layer inhibits the oxidation reaction (Correct answer)
It melts the metal mechanically; stainless reflects heat too efficiently
It uses plasma for cutting; stainless requires different plasma gas
It vaporizes the metal; stainless has too high a vaporization temperature

Correct answer: It burns (oxidizes) the iron; stainless steel's chromium oxide layer inhibits the oxidation reaction

Oxy-fuel cutting burns iron in a pure oxygen stream — the cutting oxygen reacts with the iron to form iron oxide. Stainless steel's chromium oxide protective layer (Cr2O3) prevents the iron from oxidizing, blocking the cut reaction.

Question 15: What does the electrode designation E7018 mean in SMAW (stick) welding?

E = electrode, 70 = 70,000 psi tensile strength, 1 = all positions, 8 = low hydrogen with iron powder coating (Correct answer)
E = electrode, 70 = 70 mm diameter, 18 = amps required
E = electrode, 70 = 70% efficiency, 1 = first pass only, 8 = flux type
E = electrode, 7018 = the heat number of the steel batch

Correct answer: E = electrode, 70 = 70,000 psi tensile strength, 1 = all positions, 8 = low hydrogen with iron powder coating

AWS electrode classification: E = electrode, first two digits (70) = minimum tensile strength in ksi (70,000 psi), third digit (1) = positions (all positions), last digit (8) = coating type and current (low-hydrogen, iron powder, AC/DC).

Question 16: What is the purpose of flux in brazing and soldering operations?

To prevent oxidation of the base metal surfaces during heating, allowing the filler metal to flow freely (Correct answer)
To provide filler metal for the joint
To provide mechanical strength to the joint
To cool the base metal during heating

Correct answer: To prevent oxidation of the base metal surfaces during heating, allowing the filler metal to flow freely

Flux chemically cleans and protects metal surfaces from oxidation during heating. It promotes wetting — allowing the filler metal to flow into the joint by capillary action. Without flux, oxidation prevents proper bonding.

Question 17: In machining, what does the cutting speed (surface feet per minute, SFM) of a lathe operation affect?

Tool life, surface finish quality, and productivity — it must be matched to the material being cut (Correct answer)
Only the depth of cut achievable
Only the feed rate required
The machine's electrical power consumption only

Correct answer: Tool life, surface finish quality, and productivity — it must be matched to the material being cut

Cutting speed (SFM or m/min) is the velocity of the workpiece surface past the cutting tool. Too slow wastes time; too fast generates excess heat, causing rapid tool wear and poor surface finish. Optimal speed depends on material, tool material, and depth of cut.

Question 18: What is the difference between 'distortion' and 'warping' in welding, and what is a primary preventive technique?

Both refer to dimensional change from welding heat; prevented by clamping, tack welding, and balanced welding sequences (Correct answer)
Distortion is acceptable; warping is a defect
Only thick materials distort; only thin materials warp
Distortion is fixed by grinding; warping requires re-welding

Correct answer: Both refer to dimensional change from welding heat; prevented by clamping, tack welding, and balanced welding sequences

Both distortion and warping describe dimensional changes caused by non-uniform thermal expansion and contraction during welding. Prevention: minimize heat input, use clamps/fixtures, pre-set the joint, backstep weld, or balance welds around the neutral axis.

Question 19: What does the term 'work hardening' (strain hardening) mean in metalworking?

Metal becomes harder and stronger but less ductile when cold-worked (bent, rolled, or formed at room temperature) (Correct answer)
Metal hardens from exposure to high operating temperatures
Metal is hardened by adding carbon during casting
Metal becomes harder from exposure to work environment chemicals

Correct answer: Metal becomes harder and stronger but less ductile when cold-worked (bent, rolled, or formed at room temperature)

Work hardening (strain hardening) occurs when metal is plastically deformed at room temperature. Dislocations multiply and impede further movement, increasing hardness and strength but reducing ductility. Annealing can reverse it.

Question 20: When performing an arc weld on cast iron, what special precautions are typically required?

Preheat to 400-700°F, use nickel-based electrodes, weld in short beads, and slow cool to prevent cracking (Correct answer)
Weld at high amperage without preheat for best fusion
Use standard steel electrodes without any special precautions
Weld only in the flat position without any heat treatment

Correct answer: Preheat to 400-700°F, use nickel-based electrodes, weld in short beads, and slow cool to prevent cracking

Cast iron is brittle and prone to cracking from welding heat. Preheat reduces thermal gradients, nickel electrodes deposit a weld that matches cast iron's low ductility, short beads limit heat buildup, and slow cooling prevents cracking.

Question 21: What is the purpose of a post-weld heat treatment (PWHT)?

To relieve residual stresses, improve toughness, and reduce hardness in the weld and HAZ (Correct answer)
To harden the weld metal for increased strength
To remove scale from the weld surface
To test the weld for cracks after completion

Correct answer: To relieve residual stresses, improve toughness, and reduce hardness in the weld and HAZ

PWHT (typically stress relief, normalization, or tempering) reduces residual stresses locked in during welding, improves toughness and ductility of the HAZ, reduces hardness in susceptible steels, and minimizes distortion in complex assemblies.

Question 22: What is the difference between 'nominal' pipe size and actual outside diameter for standard pipe?

Nominal pipe size (NPS) is a designator that does NOT equal the actual OD; for example, 2" NPS pipe has an OD of 2.375 inches (Correct answer)
Nominal size always equals the actual outside diameter
Nominal size equals the inside diameter
Nominal size is 10% more than actual OD

Correct answer: Nominal pipe size (NPS) is a designator that does NOT equal the actual OD; for example, 2" NPS pipe has an OD of 2.375 inches

NPS is a traditional designator system. For pipe sizes up to 12 NPS, the nominal size doesn't directly correspond to OD or ID. The OD is standardized (e.g., 2" NPS = 2.375" OD); the ID varies with wall thickness (schedule).

Question 23: In plasma arc cutting, what is the functional role of the plasma gas?

It is ionized to form a high-temperature, high-velocity plasma jet that melts and blows away the base metal (Correct answer)
It shields the cut zone from oxidation
It cools the torch nozzle during cutting
It chemically reacts with the base metal to cut it

Correct answer: It is ionized to form a high-temperature, high-velocity plasma jet that melts and blows away the base metal

Plasma cutting ionizes a gas (air, nitrogen, argon/hydrogen) into plasma — a conductive stream of superheated particles exceeding 20,000°C. This jet melts the metal while its high velocity blows the molten material away, cutting the workpiece.

Question 24: What does the metallurgical term 'carbon equivalent' (CE) predict for steel?

The weldability of the steel — higher CE means greater risk of hardening and cracking during welding (Correct answer)
The carbon content added during steelmaking
The steel's corrosion resistance rating
The amount of scrap carbon in the heat

Correct answer: The weldability of the steel — higher CE means greater risk of hardening and cracking during welding

Carbon equivalent (CE = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15) estimates hardenability. CE < 0.35 generally welds without preheat; CE 0.35-0.55 requires preheat; CE > 0.55 is hard to weld and cracks easily.

Question 25: What is 'spatter' in welding, and what are common causes?

Small droplets of molten metal expelled from the weld pool; caused by excessive current, wrong polarity, contamination, or arc length (Correct answer)
Weld cracking caused by rapid cooling
Slag on the weld surface after the bead cools
Flux residue on the weld after SMAW welding

Correct answer: Small droplets of molten metal expelled from the weld pool; caused by excessive current, wrong polarity, contamination, or arc length

Spatter is droplets of molten metal expelled from the weld during welding. Causes include excessive amperage, arc blow, moisture in electrode coating, wrong polarity, contaminated base metal, or too long an arc length.

Question 26: In a horizontal band saw used for metal cutting, what is the primary purpose of cutting fluid?

To cool the blade and workpiece, lubricate the cut, and flush away chips (Correct answer)
To harden the workpiece for a cleaner cut
To slow the blade speed for safety
To clean the workpiece surface before cutting

Correct answer: To cool the blade and workpiece, lubricate the cut, and flush away chips

Cutting fluid (coolant) serves three main functions: cool the blade and workpiece (preventing thermal damage), lubricate the cutting zone (reducing friction and blade wear), and flush chips out of the cut (preventing re-cutting and blade binding).

Question 27: What is the 'kerf' in cutting operations?

The width of material removed by the cutting process (Correct answer)
The depth of the cut
The angle of the cut relative to horizontal
The surface finish left after cutting

Correct answer: The width of material removed by the cutting process

Kerf is the width of material removed by a saw blade, cutting torch, laser, or other cutting tool. When laying out cut lines, kerf width must be accounted for to maintain final part dimensions. Typically 0.06-0.12 inches for saw cutting.

Question 28: What does 'hardness' in metals measure, and how does it relate to tensile strength?

Resistance to permanent surface indentation; hardness correlates positively with tensile strength for steels (Correct answer)
Ability to absorb impact without fracturing
Resistance to permanent deformation under steady load
Ability to be stretched without breaking

Correct answer: Resistance to permanent surface indentation; hardness correlates positively with tensile strength for steels

Hardness measures resistance to indentation. For carbon and alloy steels, there is a well-established linear correlation: tensile strength (psi) ≈ Brinell hardness × 500. Harder steel = higher tensile strength (but typically less ductility).

Question 29: What is the purpose of a magnetic particle inspection (MPI) test on a weld?

To detect surface and near-surface cracks and discontinuities in ferromagnetic materials (Correct answer)
To measure weld penetration depth
To determine the weld's tensile strength
To inspect non-ferrous welds for porosity

Correct answer: To detect surface and near-surface cracks and discontinuities in ferromagnetic materials

MPI applies magnetic flux to a ferromagnetic part and coats it with iron particles. Cracks or discontinuities disrupt the magnetic field, causing particles to accumulate and reveal defects. It detects surface and slightly subsurface flaws.

Question 30: In lathe turning, what is the function of the 'feed rate'?

The rate at which the cutting tool advances along the workpiece per revolution, controlling chip thickness and surface finish (Correct answer)
The rotational speed of the spindle in RPM
The depth of material removed in one pass
The speed of the carriage return to home position

Correct answer: The rate at which the cutting tool advances along the workpiece per revolution, controlling chip thickness and surface finish

Feed rate (inches per revolution or mm/rev) is the distance the cutting tool moves per spindle revolution. Lower feed = smoother surface finish; higher feed = faster stock removal but rougher finish. Combined with cutting speed and depth, it defines the cutting parameters.

Question 31: What is the difference between 'brazing' and 'welding'?

Brazing joins metals using a filler metal with a liquidus above 840°F (450°C) but below the base metal melting point; welding melts the base metal (Correct answer)
Brazing uses electricity; welding uses a flame
Brazing is stronger than welding in all applications
Welding uses filler metal; brazing joins without filler

Correct answer: Brazing joins metals using a filler metal with a liquidus above 840°F (450°C) but below the base metal melting point; welding melts the base metal

Welding fuses base metals together (they melt). Brazing uses a filler metal that melts above 840°F (450°C) but below the base metal's melting point, joining by adhesion (metallurgical bonding) without melting the base. Soldering uses filler below 840°F.

Ramsay Test Welding and Metal Working 1

What does SMAW stand for, and what is the common name for this welding process?