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SOLAS Sheet Metalworking study materials
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SOLAS Sheet Metalworking practice questions

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Question 1Sheet Metalworking Craft Practice

In a sheet metal workshop, which tool is used to mark a line parallel to a straight edge before cutting?

  1. A pair of dividers
  2. A jenny caliper
  3. A pair of trammels
  4. A scriber block Correct answer.

Explanation

A scriber block (surface gauge) is set to a height and run along a reference surface to scribe a line parallel to that surface or datum. Dividers and trammels mark arcs and circles from a centre point, and a jenny caliper transfers dimensions rather than drawing parallel lines.

Question 2Sheet Metalworking Craft Practice

What is the main purpose of a folding bar (bending bar) when forming a small return edge on thin sheet?

  1. To punch rivet holes on the bend centreline
  2. To clamp the sheet and lever it over a clean radius Correct answer.
  3. To stretch the metal along the bend line
  4. To anneal the bend zone by friction

Explanation

A folding bar traps the sheet against the bench edge so the overhanging material can be levered over, producing a controlled bend with a small, even radius. It does not stretch, punch, or heat the metal; it is a clamping and levering aid.

Question 3Sheet Metalworking Craft Practice

Which snip type is designed to cut tight curves and small internal radii in thin sheet?

  1. Parallel-action bench shears
  2. Straight-cut snips
  3. Aviation snips with a right-hand offset
  4. Curved or hawk-bill snips Correct answer.

Explanation

Curved (hawk-bill) snips have short, curved blades that allow the cut to follow a tight radius without distorting the sheet. Straight snips and offset aviation snips are intended for straight or gently curved cuts, and bench shears cut straight lines only.

Question 4Sheet Metalworking Craft Practice

When setting up a guillotine shear, what does the gap between the upper and lower blades control?

  1. The clearance needed for the sheet thickness Correct answer.
  2. The clamping pressure of the hold-down
  3. The surface finish of the cut edge
  4. The rake angle of the moving blade

Explanation

Blade clearance must be matched to sheet thickness: too little clearance causes excessive shearing load and blade wear, while too much produces a rough, burred edge. It is a thickness-related setting and is not the same as rake angle or hold-down pressure.

Question 5Sheet Metalworking Craft Practice

A blank of 1.5 mm mild steel is to be sheared on a treadle guillotine. Why should the sheet be held firmly against the back stop and hold-down before the cut?

  1. To reduce the blade clearance automatically
  2. To increase the shear rake angle during the stroke
  3. To prevent the blank rotating and jamming between the blades Correct answer.
  4. To work-harden the cut edge before separation

Explanation

Firm location against the back stop and hold-down keeps the blank square and stops it rotating or lifting as the blade descends, which would cause a jammed or skewed cut. The hold-down does not change rake, clearance, or the metallurgy of the edge.

Question 6Sheet Metalworking Craft Practice

Which method gives the most accurate square cut on a large sheet when a guillotine is not available?

  1. Freehand cutting with aviation snips
  2. Scribing from a true edge and cutting with a slitting shear Correct answer.
  3. Using a hand nibbler along a chalk line
  4. Shearing with a cold chisel on a bench plate

Explanation

Scribing a line from a known true edge and following it with a slitting shear keeps the cut referenced to a datum, giving a square result. Freehand snips, chalk lines, and chisel cuts all lack a reliable datum and produce wandering or ragged edges.

Question 7Sheet Metalworking Craft Practice

What happens to the bend allowance if the inside bend radius is increased while material thickness and bend angle stay the same?

  1. It stays the same because thickness is unchanged
  2. It decreases because the neutral axis shortens
  3. It increases because the neutral-axis arc length grows Correct answer.
  4. It becomes zero at 90 degrees

Explanation

Bend allowance is the developed length along the neutral axis, calculated from the bend angle and the neutral-axis radius. Increasing the inside radius moves the neutral axis outward, so the arc length and hence the allowance increase.

Question 8Sheet Metalworking Craft Practice

A 90-degree bend is made in 2 mm sheet with an inside radius of 2 mm. Using a K-factor of 0.5, which value is closest to the bend allowance?

  1. 9.4 mm
  2. 3.1 mm
  3. 4.7 mm Correct answer.
  4. 6.3 mm

Explanation

Bend allowance equals the bend angle in radians multiplied by the neutral-axis radius (inside radius plus K times thickness). Here the neutral radius is 2 + 0.5 x 2 = 3 mm, and 90 degrees is 1.571 rad, giving about 4.71 mm.

Question 9Sheet Metalworking Craft Practice

Why is bend relief (a small cut-out or notch) provided at the end of a bend line in a flanged component?

  1. To provide a location for a weld tack
  2. To increase the load capacity of the finished part
  3. To reduce the springback angle after forming
  4. To allow the flange to be formed without tearing the adjacent corner Correct answer.

Explanation

Without relief, the material at the end of the bend line is constrained by the adjacent wall and tends to tear or distort as the flange is formed. The notch lets the metal flow so the corner stays sound. It does not control springback, strength, or welding.

Question 10Sheet Metalworking Craft Practice

What is springback in sheet metal bending?

  1. The elastic recovery of the bend when the forming load is released Correct answer.
  2. The permanent set left after the load is removed
  3. The sliding of the neutral axis toward the outside of the bend
  4. The thinning of the outer fibre at the bend

Explanation

During bending, part of the deformation is elastic; when the punch is withdrawn, that elastic strain recovers, so the bend angle opens slightly. This recovery is springback, and it must be compensated by overbending or by tooling correction.

Question 11Sheet Metalworking Craft Practice

Which material characteristic most increases springback during bending?

  1. Large grain size and low hardness
  2. Low yield strength and high ductility
  3. High yield strength and high modulus Correct answer.
  4. High thermal conductivity

Explanation

Springback depends on the ratio of yield stress to elastic modulus: a high yield strength with a high modulus means more elastic strain is recovered on unloading. Soft, ductile material with low yield strength springs back less.

Question 12Sheet Metalworking Craft Practice

In press-tool terminology, what is the function of the stripper plate?

  1. To guide the punch into the die opening
  2. To hold the blank down and strip it from the punch on the return stroke Correct answer.
  3. To bend the flange to its final angle
  4. To eject the finished part from the die cavity

Explanation

The stripper plate clamps the workpiece during punching and then strips it off the punch as the ram rises, preventing the part from being carried up. Guiding the punch is the job of a guide plate or pillar set, and ejection from the die is done by a knockout or ejector.

Question 13Sheet Metalworking Craft Practice

What is the purpose of the shear angle (rake) on the blade of a guillotine?

  1. To produce a polished cut edge
  2. To set the blade clearance automatically
  3. To spread the cutting load along the blade and reduce peak force Correct answer.
  4. To eliminate the need for hold-downs

Explanation

Rake means only a short length of the blade engages the sheet at any instant, so the peak shearing force is reduced and the machine frame can be lighter. The trade-off is that the sheet is pushed sideways, which is why hold-downs are needed.

Question 14Sheet Metalworking Craft Practice

Which joint is formed by interlocking two folded edges and then flattening them together?

  1. A lap joint with rivets
  2. A butt weld
  3. A grooved seam (double seam) Correct answer.
  4. A corner spot weld

Explanation

In a grooved seam, the two folded edges are hooked together and then closed down and flattened, producing a mechanical interlock without fasteners. Riveted laps, butt welds, and spot welds all rely on separate fastening or fusion.

Question 15Sheet Metalworking Craft Practice

Why is a small gap left between the mating edges of a folded seam before closing?

  1. To allow for thermal expansion during service
  2. To permit the interlocking hook to engage and close cleanly Correct answer.
  3. To provide a path for sealant to escape
  4. To reduce the springback of the seam

Explanation

The folded hooks need clearance to engage before the seam is closed down and flattened. If the edges are cut too tight, the hooks cannot interlock and the seam buckles or opens. The gap is a forming allowance, not a service or sealing feature.

Question 16Sheet Metalworking Craft Practice

Which rivet head style is normally used where the head must sit flush with the sheet surface?

  1. Pan head
  2. Mushroom head
  3. Countersunk head Correct answer.
  4. Snap (round) head

Explanation

A countersunk rivet has a conical head that sits in a matching countersink so the finished surface is flush. Snap, pan, and mushroom heads all stand proud of the surface and are used where flushness is not required.

Question 17Sheet Metalworking Craft Practice

When setting a solid rivet, why must the rivet shank length be chosen to suit the total thickness of the sheets?

  1. To match the drill diameter exactly
  2. To ensure enough material forms the tail without excessive buckling Correct answer.
  3. To prevent galvanic corrosion between sheets
  4. To allow the rivet to be removed easily

Explanation

The shank must protrude enough beyond the sheets to form a sound tail, but too much protrusion buckles or bends the shank instead of upsetting it. Correct length is therefore a function of stack thickness and rivet diameter.

Question 18Sheet Metalworking Craft Practice

What is the main safety reason for keeping snip blades closed and pointed away from the body when carrying them?

  1. To stop the blades from rusting in humid air
  2. To prevent accidental stabbing or laceration if the operator stumbles Correct answer.
  3. To keep the cutting edges sharp for longer
  4. To avoid magnetising the blades

Explanation

Closed, body-away blades reduce the chance of a serious cut if the operator falls or the tool is knocked. Edge life, magnetism, and corrosion are not the primary reason for this carrying rule.

Question 19Sheet Metalworking Craft Practice

Which personal protection is most important when hand-shearing sheet metal that produces sharp slivers?

  1. Ear defenders
  2. A dust respirator
  3. Tinted goggles
  4. Cut-resistant gloves Correct answer.

Explanation

Hand shearing throws off sharp slivers and leaves burred edges, so cut-resistant gloves protect the hands that guide and hold the sheet. Goggles protect the eyes from flying chips but do not address the dominant laceration hazard; respiratory and hearing protection are for other processes.

Question 20Sheet Metalworking Craft Practice

A sheet develops a raised, wavy edge after being cut with hand snips. What is the most likely cause?

  1. The cut line was scribed too deeply
  2. The blades were not fully closed on each stroke, curling the waste edge Correct answer.
  3. The sheet was too thick for the snips
  4. The snips were too sharp

Explanation

Failing to take full strokes leaves the cut edge curled and distorted because the blades pinch rather than shear cleanly. Sharp blades help, and scribe depth has little effect, while excessive thickness would overload the tool rather than create a wavy edge.

Question 21Sheet Metalworking Craft Practice

Which operation is performed on a roll former rather than on a press brake?

  1. Embossing a logo into a flat panel
  2. Piercing a row of holes in a flat blank
  3. Producing a continuous longitudinal profile from coil or strip Correct answer.
  4. Bending a single transverse line on a short sheet

Explanation

Roll forming passes strip through successive roll stands to generate a continuous longitudinal profile, which suits long runs of constant section. Press brakes make discrete transverse bends, and piercing or embossing are press operations, not roll forming.

Question 22Sheet Metalworking Craft Practice

What is the purpose of a joggle in an aircraft-style sheet metal panel?

  1. To stiffen the panel against buckling
  2. To provide a stepped offset so two sheets can overlap flush Correct answer.
  3. To allow for thermal expansion of the skin
  4. To create a drainage channel

Explanation

A joggle is a small step formed along an edge so that an overlapping sheet sits flush with the surrounding surface. Stiffening is achieved by beads or flanges, and drainage or expansion allowances are not the function of a joggle.

Question 23Sheet Metalworking Craft Practice

Which alloying element is chiefly responsible for the good corrosion resistance of stainless steel sheet?

  1. Chromium Correct answer.
  2. Silicon
  3. Manganese
  4. Copper

Explanation

Chromium forms a thin, self-healing passive oxide layer on the surface that protects the steel from corrosion. Copper, manganese, and silicon are added for other purposes such as strength, hardenability, or deoxidation, and do not provide the passive film.

Question 24Sheet Metalworking Craft Practice

Why does work-hardened aluminium sheet crack when bent to a tight radius?

  1. Its melting point has fallen below the forming temperature
  2. Its thermal conductivity has dropped sharply
  3. Its ductility has been reduced by prior cold working Correct answer.
  4. Its grain size has grown during rolling

Explanation

Cold working raises dislocation density and reduces the remaining ductility, so the outer fibre cannot stretch far enough and cracks at a tight radius. Annealing restores ductility before severe forming. Melting point, conductivity, and grain growth are not the cause.

Question 25Sheet Metalworking Craft Practice

What does annealing achieve before a heavily worked sheet is formed further?

  1. It raises the yield strength to resist deformation
  2. It changes the surface colour for inspection
  3. It restores ductility by relieving internal strain Correct answer.
  4. It increases the sheet thickness

Explanation

Annealing uses controlled heating and cooling to allow recovery and recrystallisation, removing the strain introduced by cold working and restoring ductility. This lets the sheet be formed again without cracking; it does not raise strength or change thickness.

Question 26Sheet Metalworking Craft Practice

In sheet metalwork, what does the term 'gauge' refer to when applied to a ferrous sheet?

  1. The width of the sheet as supplied
  2. A standard number that indicates sheet thickness Correct answer.
  3. The surface finish grade of the sheet
  4. The maximum length the shear can cut

Explanation

Sheet gauge is a standard numbering system where the gauge number correlates inversely with thickness: a lower gauge number means thicker material. The gauge number alone is not sufficient because different standards exist, so the actual thickness should be confirmed for critical work.

Question 27Sheet Metalworking Craft Practice

Which type of snip is designed for cutting internal profiles and tight curves because its cutting blades are narrow and can turn within the cut?

  1. Aviation snip with compound leverage
  2. Notching or nibbling snip
  3. Straight-pattern tinner's snip
  4. Curved-blade or circle snip Correct answer.

Explanation

Curved-blade snips have short, curved cutting edges that let the tool follow a tight arc and cut small internal shapes. Straight snips are for long straight cuts and cannot turn sharply without distortion, while aviation snips give leverage but still have relatively long blades.

Question 28Sheet Metalworking Craft Practice

What is the primary purpose of a set of rolls (slip rolls) in sheet metal fabrication?

  1. To punch holes in flat sheet before forming
  2. To form cylindrical and conical shells by progressive bending Correct answer.
  3. To press a stiffening rib into a flat panel
  4. To shear straight blanks to accurate width

Explanation

Slip rolls pass the sheet between three rolls whose spacing is adjusted to curve the material progressively along its length, producing cylinders and cones. The process is a continuous bending operation, not a cutting or punching one.

Question 29Sheet Metalworking Craft Practice

A guillotine shear is set to cut 1.5 mm mild steel, and the blade clearance is set far too large. What defect is most likely on the cut edge?

  1. A rough, torn edge with a heavy burr Correct answer.
  2. An edge hardened to a glass-like finish
  3. A clean, polished sheared face with minimal burr
  4. A chamfered edge with a rolled-over top

Explanation

Correct blade clearance allows the shear cracks from the top and bottom edges to meet, producing a clean cut. Excessive clearance lets the material tear rather than shear, leaving a rough fracture face and a pronounced burr.

Question 30Sheet Metalworking Craft Practice

Which statement correctly describes the neutral axis in a bent sheet?

  1. It is the inner surface of the bend where compression is greatest
  2. It is the outer surface of the bend where tension is greatest
  3. It is the line where bending stress is zero and fibre length is unchanged Correct answer.
  4. It is the mid-thickness line where the material always yields first

Explanation

During bending, the outer fibres stretch and the inner fibres compress; somewhere between them is a layer that neither stretches nor compresses. This neutral axis is used as the reference for developed length calculations, usually shifted toward the inside of the bend.

Question 31Sheet Metalworking Craft Practice

Why is a press brake lower die with a narrow V-opening generally chosen for bending thin sheet?

  1. It allows the punch to penetrate the die surface
  2. It reduces the tonnage required and allows a tighter inside radius Correct answer.
  3. It eliminates the need for any bend allowance calculation
  4. It prevents all springback by over-bending automatically

Explanation

A narrow V-opening concentrates the bending force, lowering tonnage and producing a smaller inside bend radius closer to the punch tip. The minimum recommended V-opening is related to material thickness, so too narrow a V can mark the sheet or overload the tooling.

Question 32Sheet Metalworking Craft Practice

What is the function of a corner notch when laying out a box or tray to be folded from a single blank?

  1. It allows the corner to be welded before folding
  2. It removes material so adjacent flanges can fold without overlapping or tearing Correct answer.
  3. It provides a locating hole for the folding jig
  4. It strengthens the corner by adding extra metal

Explanation

When two flanges meet at a corner, the surplus material must be removed or the folds will interfere and buckle. A corner notch removes exactly the material required so the side and end flanges close cleanly.

Question 33Sheet Metalworking Craft Practice

Which method is normally used to produce a raised stiffening bead across a large flat panel to reduce drumming?

  1. Riveting a separate strip onto the panel
  2. Swaging with a bead-forming tool or a press tool Correct answer.
  3. Shearing a narrow slot across the panel
  4. Annealing the panel before rolling

Explanation

A swage or bead is a shallow formed rib that stiffens a flat panel by interrupting the flat expanse and raising its resistance to flexing. It is produced by pressing or rolling the sheet between shaped tools.

Question 34Sheet Metalworking Craft Practice

A solid rivet is to join two aluminium sheets totalling 4 mm thick. Which rivet shank length is appropriate before setting?

  1. About 5.5 mm, giving roughly 1.5 times diameter protrusion Correct answer.
  2. About 2 mm, shorter than the stack thickness
  3. About 12 mm, giving three times diameter protrusion
  4. About 4 mm, equal to the stack thickness

Explanation

The shank must fill the hole through the stack and leave enough material beyond the sheet to form the tail. A common rule is that the protrusion should be about 1.5 times the rivet diameter, so a shank slightly longer than the stack is required.

Question 35Sheet Metalworking Craft Practice

Which rivet is designed to be set from one side only, using a special tool that pulls a mandrel through the body?

  1. Countersunk solid rivet
  2. Blind (pop) rivet Correct answer.
  3. Solid snap-head rivet
  4. Tubular rivet

Explanation

Blind rivets contain a mandrel that is pulled to expand or upset the body, forming a tail on the far side where access is impossible. Solid and tubular rivets require access to both faces to form the tail with a hammer or press.

Question 36Sheet Metalworking Craft Practice

In a folded seam, what does the term 'single seam' describe?

  1. Two edges interlocked and then flattened together
  2. An edge folded over a wire insert
  3. One edge folded over the other once and closed flat Correct answer.
  4. A seam joined only by spot welds

Explanation

A single seam is formed by folding one edge of the sheet over the edge of the mating part once, then closing it flat. A double seam interlocks two folded edges before flattening, giving a stronger joint.

Question 37Sheet Metalworking Craft Practice

Which tool is used to turn over a narrow edge of sheet metal to form a folded hem by hand?

  1. A pair of straight snips
  2. A ball-peen hammer only
  3. A cold chisel
  4. A hand seamer or folding bar Correct answer.

Explanation

A hand seamer, sometimes called a folding bar, has a flat jaw that grips the edge and rolls it over evenly. Snips cut rather than fold, and a hammer alone tends to stretch and distort the edge.

Question 38Sheet Metalworking Craft Practice

Why is a joggle formed on one edge of a sheet that is to be joined to another sheet by rivets?

  1. To offset the sheets so their outer surfaces finish flush after riveting Correct answer.
  2. To provide a channel for sealant only
  3. To increase the overall thickness of the joint
  4. To allow the rivets to be driven without a hole

Explanation

A joggle is a small step formed along the edge so the two sheets overlap without a step showing on the outer surface. The offset matches the sheet thickness, keeping the finished skin flush.

Question 39Sheet Metalworking Craft Practice

Which material is most suitable for the punch and die of a production press tool where long tool life is required?

  1. Copper sheet
  2. Tool steel hardened and tempered Correct answer.
  3. Aluminium alloy plate
  4. Mild steel plate

Explanation

Tool steels are alloyed and heat-treated to give high hardness and wear resistance, which is essential where the tooling is cycled many thousands of times. Softer materials wear rapidly and lose the fine cutting clearance needed for a clean edge.

Question 40Sheet Metalworking Craft Practice

In a press tool, what is the function of the pilot pin?

  1. To eject the finished part from the die
  2. To locate the strip accurately in the tool before piercing or blanking Correct answer.
  3. To cushion the impact of the press ram
  4. To strip the scrap from the punch

Explanation

Pilot pins enter holes already in the strip and position it precisely relative to the tooling, ensuring each station works on the correct location. Ejection and stripping are performed by separate components.

Question 41Sheet Metalworking Craft Practice

A component is to be bent to 90 degrees in a press brake, and the operator finds the angle opening out after the ram is released. Which action corrects this?

  1. Reduce the bend radius by using a wider V-die
  2. Over-bend slightly beyond 90 degrees to allow for springback Correct answer.
  3. Anneal the sheet after bending
  4. Increase the ram speed to shock the material

Explanation

Springback causes the material to relax elastically when the load is removed, so the finished angle is greater than the formed angle. Over-bending by the expected springback amount compensates and yields the required 90 degrees.

Question 42Sheet Metalworking Craft Practice

What is the purpose of a bend deduction in a flat-pattern calculation?

  1. To allow for the thickness of the protective film on the sheet
  2. To subtract the material taken up by the bend from the sum of the outside dimensions Correct answer.
  3. To add extra length so the part can be trimmed after forming
  4. To calculate the tonnage needed on the press brake

Explanation

The flat blank must be shorter than the sum of the outside flange dimensions because the material at the bend is shared between the two flanges. The bend deduction accounts for this, and it is related to the bend allowance and the outside setback.

Question 43Sheet Metalworking Craft Practice

Why is a K-factor of 0.5 commonly used as a simple approximation for bend allowance?

  1. It places the neutral axis at mid-thickness, giving a conservative developed length Correct answer.
  2. It assumes the material does not stretch or compress at all
  3. It allows for the tooling radius being larger than the punch tip
  4. It assumes the neutral axis lies on the inner surface of the bend

Explanation

With the neutral axis at half the thickness, the bend allowance is calculated using the mid-thickness radius, which is a simple and reasonably conservative approximation. In practice the neutral axis shifts inward, so the true K-factor depends on the radius-to-thickness ratio.

Question 44Sheet Metalworking Craft Practice

Which defect is caused by bending a sheet with the bend line running across a heavily work-hardened, unannealed region?

  1. Cracking or splitting on the outside of the bend Correct answer.
  2. Excessive thickening of the inside radius
  3. Improved surface finish at the bend
  4. Uniform elongation without any change in thickness

Explanation

Work-hardened material has little remaining ductility, so the tensile strain on the outside of the bend exceeds what the material can accommodate and a crack initiates. Annealing before bending restores ductility and prevents this.

Question 45Sheet Metalworking Craft Practice

Which aluminium alloy condition is generally easiest to bend to a tight radius without cracking?

  1. Strain-hardened (H18)
  2. Solution-treated and naturally aged (T4)
  3. As-cast and unworked
  4. Fully annealed (O temper) Correct answer.

Explanation

Annealed O-temper material has the lowest strength and highest ductility, allowing it to accommodate the strain of a tight bend. Higher tempers such as H18 are heavily work hardened and crack readily at tight radii.

Question 46Sheet Metalworking Craft Practice

A sheared blank shows a burr on one side only. What is the most likely explanation?

  1. The sheet was too thin for the machine
  2. The blade clearance is uneven or the blades are misaligned Correct answer.
  3. The hold-down pressure was too high
  4. The blade rake angle was too small

Explanation

A burr on one side indicates that the cutting edges are not meeting correctly along the cut line, usually because clearance is uneven or the blades are out of alignment. Even clearance produces a consistent edge along the whole cut.

Question 47Sheet Metalworking Craft Practice

Why is the punch usually given slightly less clearance than the die in a piercing tool when cutting thin sheet?

  1. To reduce the press tonnage to below the machine rating
  2. To prevent the punch from being pulled out of its holder
  3. To allow the punch to be reground many times without shimming
  4. To allow the fracture cracks to meet and produce a clean hole with minimal burr Correct answer.

Explanation

Correct clearance lets the cracks initiated from the punch and die edges meet in the middle of the sheet, giving a clean sheared band. If clearance is excessive, the cracks miss and the material tears, producing a rough edge and burr.

Question 48Sheet Metalworking Craft Practice

Which safety precaution applies specifically when using a fly press for light sheet metal blanking?

  1. Remove the guard to improve visibility
  2. Wear loose gloves to protect the fingers
  3. Operate the press with the ram at the top of its stroke
  4. Keep hands clear of the tool area and use tongs or a holder to place the blank Correct answer.

Explanation

A fly press delivers a sudden high force, so the operator must never place fingers in the tool area; tongs or a holder keep hands clear. Guards must remain fitted, and loose gloves can catch in moving parts.

Question 49Sheet Metalworking Craft Practice

What is the main reason for deburring a sheared edge before the part is passed to the next operation?

  1. To increase the hardness of the cut edge
  2. To make the edge suitable for welding without cleaning
  3. To remove sharp edges that could injure the operator or damage tooling Correct answer.
  4. To reduce the overall length of the part

Explanation

Shearing leaves a sharp burr that can cut hands and interfere with fit-up or damage press tooling in later operations. Deburring removes this hazard and improves the quality of the finished part.

Question 50Sheet Metalworking Craft Practice

A sheet is to be formed into a cylinder with a longitudinal seam. Which sequence is correct for producing an accurate finished diameter?

  1. Roll the sheet and then trim the length to fit
  2. Weld the seam flat first, then roll the assembly
  3. Roll the cylinder, tack the seam, then finish-weld and check the diameter Correct answer.
  4. Cut the blank to the finished circumference without allowing for the seam

Explanation

Rolling first establishes the curvature and allows the seam edges to be aligned and tacked in position. Finish-welding after tacking controls distortion, and the diameter is checked before final welding.