Level 1–8 · Shipyard job simulation track

From Blueprint to Fit-Up

Read the controlled drawing. Establish the datum. Transfer measurements. Fit, check, correct, and verify—never guess.

Training, not qualification: this visual practice does not certify a welder or replace supervised hands-on work, an approved WPS, required test[...]

Continue to the virtual assembly →

Module 01 · Level 1 · Shipyard fundamentals

Parts, people, and shop language

A shipfitter lays out and fits parts to the drawing; a welder deposits the specified weld; a tack welder places temporary welds to hold a fit, and a helper supports safe material handling and preparation. Plate is flat stock. Stiffeners (including longitudinals), frames, webs, flanges, brackets, foundations, and bulkheads identify common structure. A drawing is the controlled instruction; a sketch communicates an idea, a detail enlarges a feature, and a revision records an approved change. Confirm the current revision and required PPE before work.

Blueprint exerciseSelect the labels on the sketch to identify the plate, stiffener web, and flange.
Parts, people, and shop language training drawingA schematic steel plate and stiffener with reference lines. Select numbered callouts to read their explanations. Not to scale.125 mm OFFSET · SCHEMATICPLATEWEBFLANGEBASELINE / DATUMCENTERLINE123
  1. 1. Plate

    The broad, flat steel member supports the assembly.

  2. 2. Web

    The upright portion of the stiffener resists shear and supports the flange.

  3. 3. Flange

    The top face of this T stiffener adds bending strength.

Shipyard terminology · quick reference

Plate
Flat steel stock used as a structural surface or member.
Stiffener / longitudinal
A reinforcing member; a longitudinal runs along the vessel’s length.
Web
The upright portion of a beam or stiffener connecting its flanges.
Flange
The projecting face of a structural section, often at the top or bottom of a web.
Bulkhead
A structural partition dividing spaces in a vessel.
Frame / station
Transverse structure or a numbered location along a vessel.
Seam
A joint between plates running generally in the same direction as the plate length.
Butt joint
Two members meet edge-to-edge, usually in the same plane.
Fillet joint
Members meet at an angle; a fillet weld fills the corner.
Root gap / root opening
The separation between member edges at the root of a joint.
Bevel
An angled edge preparation that forms part of a groove.
Land / root face
The un-beveled portion at the edge nearest the root.
Tack weld
A temporary weld used to hold parts in position; it is not automatically a completed weld.
Fit-up
Preparing, positioning, and checking parts before production welding.
Datum
A defined reference point, line, or plane from which measurements are controlled.
Bracket / foundation
A supporting member or base for equipment and structure.
Mill scale
An oxide layer formed on hot-rolled steel; preparation requirements determine removal.
WPS
Welding Procedure Specification: an approved instruction for the welding work.
Which document controls the dimensions and revision for fabrication?

Not yet marked complete.

Module 02 · Level 2 · Measurements and layout

Read dimensions without guessing

Dimensions state nominal geometry; tolerances state the permitted variation. In chain dimensioning, each segment starts where the prior one ends, so errors can accumulate. Baseline dimensions share a common origin and make each location independently traceable. Confirm units (this exercise uses mm), dimension arrows, and any tolerance in the title block or note before measuring.

Blueprint exerciseCompare the chain and baseline dimensions shown; select each label for its meaning.
Read dimensions without guessing training drawingA schematic steel plate and stiffener with reference lines. Select numbered callouts to read their explanations. Not to scale.125 mm OFFSET · SCHEMATICPLATEWEBFLANGEBASELINE / DATUMCENTERLINECHAIN: 600 + 600 mmBASELINE: 1200 mm · TOL ±2 mm123
  1. 1. 600 mm

    A segment dimension in a chain. Measure from the previous point, not from an assumed origin.

  2. 2. 1200 mm

    The cumulative location from the baseline in this example.

  3. 3. ±2 mm

    The allowed variation from nominal; it is not permission to round or guess.

A part is located 1200 mm from the baseline with a ±2 mm tolerance. Which interval is acceptable?

Not yet marked complete.

Module 03 · Level 2 · Measurements and layout

Establish the reference system

A datum is the defined origin or reference from which measurements are controlled. A baseline runs along a chosen direction; a centerline divides a feature symmetrically; frame or station lines locate structure along the vessel; offset lines locate features away from a reference. Mark and protect the agreed references before transferring any dimensions.

Blueprint exerciseTrace the baseline first, then use its intersection with the centerline as the datum.
Establish the reference system training drawingA schematic steel plate and stiffener with reference lines. Select numbered callouts to read their explanations. Not to scale.125 mm OFFSET · SCHEMATICPLATEWEBFLANGEBASELINE / DATUMCENTERLINE123
  1. 1. Baseline

    The horizontal reference used to locate the stiffener.

  2. 2. Centerline

    The vertical reference dividing the plate into symmetric sides.

  3. 3. Datum

    The marked origin where the baseline and centerline meet.

Where should the 125 mm stiffener offset be measured from?

Not yet marked complete.

Module 04 · Level 3 · Blueprints and weld symbols

Read the weld symbol as an instruction

The arrow connects a joint to the reference line. For standard welding symbols, the symbol below the reference line identifies the arrow side and a symbol above identifies the other side. A triangle indicates a fillet weld; groove shapes such as V or bevel indicate groove preparation. A circle at the arrow/reference-line junction means all-around; a flag means field weld. Read size, length, pitch, contour/finish, and tail notes together. The drawing symbol alone does not authorize a process or procedure.

Blueprint exerciseInspect the schematic weld callouts and match the symbol markers to their notes.
Read the weld symbol as an instruction training drawingA schematic steel plate and stiffener with reference lines. Select numbered callouts to read their explanations. Not to scale.125 mm OFFSET · SCHEMATICPLATEWEBFLANGEBASELINE / DATUMCENTERLINEWELD SYMBOL · SCHEMATICARROW SIDE · ALL-AROUNDREAD SIZE / LENGTH / PITCH / TAIL123
  1. 1. Arrow side

    The fillet symbol below the reference line applies to the arrow side of the joint.

  2. 2. Other side

    A symbol above the reference line applies to the opposite side.

  3. 3. Tail / flag

    Tail notes add process or specification references; the flag indicates a field weld.

What does a small circle at the arrow/reference-line junction indicate?

Not yet marked complete.

Module 05 · Level 3 · Blueprint interpretation

Connect elevations, sections, and details

Plan, elevation, and section views describe the same assembly from different directions. A section cut marker shows where and which way to look; a detail callout enlarges a local feature and refers to its detail view. Scale helps visualize geometry but should not replace a written dimension. Before laying out parts, cross-check title block, part marks, material callouts, notes, and current revision.

Blueprint exerciseFollow the A–A cut marker to the section and find the enlarged joint detail.
Connect elevations, sections, and details training drawingA schematic steel plate and stiffener with reference lines. Select numbered callouts to read their explanations. Not to scale.125 mm OFFSET · SCHEMATICPLATEWEBFLANGEBASELINE / DATUMCENTERLINEPLANELEVATIONSECTION A–ADETAIL B · NOT TO SCALE123
  1. 1. Elevation

    Shows vertical heights and the stiffener profile above the plate.

  2. 2. A–A

    The section cut line and viewing direction link the plan to the section view.

  3. 3. Detail B

    An enlarged view clarifies the joint geometry; use written dimensions, not screen pixels.

If a printed drawing is not at its stated scale, what should control your layout?

Not yet marked complete.

Module 06 · Level 2/5 · Measurement transfer and fit-up

Transfer the drawing to the assembly

Plan the layout from the drawing, establish and verify the datum, then mark and independently re-measure each location. Check part marks and orientation before positioning. Use clamps and shims to hold the part without forcing it; confirm dimensions and alignment before temporary tacks. If the part does not fit, diagnose the reference, dimension transfer, joint preparation, and distortion rather than hiding the mismatch.

Blueprint exerciseUse the baseline and 125 mm offset to locate the stiffener; compare the marked position with the drawing.
Transfer the drawing to the assembly training drawingA schematic steel plate and stiffener with reference lines. Select numbered callouts to read their explanations. Not to scale.125 mm OFFSET · SCHEMATICPLATEWEBFLANGEBASELINE / DATUMCENTERLINE123
  1. 1. 1 · Establish

    Mark the baseline and confirm the datum before any offset.

  2. 2. 2 · Measure

    Transfer the 125 mm offset from the specified datum with a suitable rule or tape.

  3. 3. 3 · Position

    Align the stiffener to the mark and secure it with clamps before checking.

The stiffener is 25 mm out when checked. What is the best first correction?

Not yet marked complete.

Module 07 · Level 4/6 · Steel measurement and joint preparation

Measure steel and prepare the joint

Choose tools for the check: tape or steel rule for length, combination square for 90° layout, level for level/plumb checks, and gap gauge for root opening. Compare bevel angle, root face (land), and root gap with the specified drawing and approved welding procedure. Remove slag, burrs, mill scale, rust, oil, and other contamination as required. Grinding, chipping, cutting, or gouging must follow site safety requirements and the applicable procedure. Never assume a generic preparation is acceptable.

Blueprint exerciseInspect the joint cross-section and list every visible defect before fit-up.
Measure steel and prepare the joint training drawingA schematic joint-preparation cross-section. Select numbered callouts to read their explanations. Not to scale.JOINT PREPARATION · SCHEMATICBEVELROOT GAPCONTAMINATIONBURR123
  1. 1. Bevel angle

    A bevel outside the specified angle changes groove geometry and access.

  2. 2. Root gap / land

    A missing, excessive, or undersized root opening/face can impair penetration or fit.

  3. 3. Surface / edge

    Contamination and burrs interfere with a clean, consistent joint.

What should determine the target bevel, land, and root gap?

Not yet marked complete.

Practice engine · browser only

Virtual hands-on checks

Try the tool selection, joint preparation, position, and alignment checks before moving to the integrated challenge. Feedback explains the likely source of an error.

Choose tools: transfer the 125 mm baseline offset, check squareness and root gap, then hold the stiffener.

Bevel angle mismatch cross-sectionThe two bevel faces have different angles. Schematic, not to scale.
Bevel angle mismatchThe two bevel faces have different angles.
No root gap cross-sectionThe beveled edges meet with no root opening. Schematic, not to scale.
No root gapThe beveled edges meet with no root opening.
Excessive root gap cross-sectionThe root opening is wider than the schematic target. Schematic, not to scale.
Excessive root gapThe root opening is wider than the schematic target.
Missing root face cross-sectionThe bevels taper to the root instead of leaving a land. Schematic, not to scale.
Missing root faceThe bevels taper to the root instead of leaving a land.
Surface contamination cross-sectionA marked surface shows scale, rust, or oil contamination. Schematic, not to scale.
Surface contaminationA marked surface shows scale, rust, or oil contamination.
Burred cut edge cross-sectionIrregular projections remain on the cut edge. Schematic, not to scale.
Burred cut edgeIrregular projections remain on the cut edge.
Identify all defects shown in the schematic joint-preparation review.

Compare these features with the drawing and applicable WPS; the exercise does not prescribe preparation values.

Record the simulated fit-up checks against the displayed tolerance.

Tolerances: squareness ±1°, plumb ±2 mm, root gap 3 ±1 mm, offset 125 ±2 mm, mismatch ±2 mm.

Fitting workflow · no skipping ahead

Try clicking a future step first; the challenge explains why the reference and measurement must come first. The review records each accepted step.

  1. Read drawing — pending
  2. Establish reference — pending
  3. Measure — pending
  4. Fit — pending
  5. Check — pending
  6. Correct — pending
  7. Verify — pending

Start with the current controlled drawing and its revision.

Open integrated Level 8 job simulation →

Reference briefings · Levels 4–8

Connect the lesson to the shop workflow

Level 4 · Cutting and edge preparation

Recognize oxyfuel torch components and plasma cutting or arc-gouging equipment; choose among straight cuts, bevels, or old-weld removal only under the applicable procedure and si[...]

Level 5 · Shipfitting and assembly

Fit plate, angle, channel, stiffener, bracket, or foundation using controlled clamping and shimming. A tack holds a fit; it is not a completed weld. Plan sequence with shrinkage [...]

Level 6 · Welding processes and positions

Recognize SMAW (stick), GMAW (MIG), GTAW (TIG), and FCAW (flux-cored), plus flat, horizontal, vertical, and overhead orientations and 1F, 2F, 3F, and 4F fillet-position designati[...]

Level 7 · Straightening and quality control

Inspect for high/low spots, bow, twist, angular distortion, and weld shrinkage. Heat straightening or mechanical correction is assessed by qualified personnel under the governing[...]

Level 8 · Integrated job simulation

Interpret the current drawing, lay out a plate, select the specified preparation, position and align an assembly, identify the weld instruction, and complete a virtual inspection[...]