Layout and Fitting I
Layout and fitting for boilermakers, followed through a winter in Ironbridge Industrial's fabrication shop in Port Allen, Louisiana: reading fabrication drawings and welding symbols, layout tools and fractions of an inch, shop geometry, squaring plate and laying out bevels and bolt circles, rolled shell cut lengths, structural shapes, pipe and tube, fitting with dogs, wedges, strongbacks and tacks, and tolerances and weld shrinkage, ending with a capstone that lays out, rolls and fits an ASME pressure vessel shell course through its inspection hold points.
BLR-130 12 lessons · 3 h 54 min ▶ Video lessons coming soon
Offered by HSM University · Boilermaking
This is the American version of this course. See the Canadian version.
What you'll learn
- Describe what layout and fitting produce, how they fit into the flow of shop fabrication, and how material traceability is kept from plate to finished part
- Read general arrangement, detail and shop drawings in third-angle projection, find datums, revisions, notes and tolerances, and mark locations from a datum
- Read welding symbols to AWS A2.4, including arrow and other side, groove dimensions, root openings, field and all-around welds, and use bills of material and cut lists
- Use and check tapes, squares, straightedges, trammels, punches and precision instruments, and convert between millimeters, decimal inches and fractions
- Apply shop geometry: the 3-4-5 triangle, perpendiculars and bisectors, circle division, chords and arcs, and the sagitta for checking curves
- Lay out plate from a base line, square it by diagonals, allow for the kerf, lay out bevels and lay out bolt holes straddling the center lines
- Calculate the cut length of a shell plate from the mean diameter, root opening and shrinkage allowance, and arrange shell courses with offset long seams
- Lay out structural members from work points, including cut lengths, brace angles, copes and bolt holes, and field-measure existing steel before replacing it
- Lay out pipe and tube, including quarter lines, cut lengths between fittings, a two-piece miter and a boiler tube dutchman
- Fit joints with clamps, dogs, wedges, strongbacks, spiders and spacers, and plan the size, spacing and sequence of tack welds
- Check fits against tolerances for out-of-roundness, offset, peaking and root opening, estimate weld shrinkage and control distortion
- Lay out, roll, fit and record a vessel shell course and its seams through the shop's hold points
Course content
12 lessons · 3 h 54 min total · final exam
- 1 Layout and fitting in the boilermaker trade 20 min · quiz
- 2 Reading fabrication and shop drawings 19 min · quiz
- 3 Weld symbols and bills of material for fitters 20 min · quiz
- 4 Layout tools and measuring instruments 20 min · quiz
- 5 Shop geometry for layout 19 min · quiz
- 6 Plate layout: squaring, bevels and hole patterns 19 min · quiz
- 7 Rolled shells: circumference, rolling and seam allowances 20 min · quiz
- 8 Structural shapes and their layout 20 min · quiz
- 9 Pipe and tube layout basics 20 min · quiz
- 10 Fitting techniques: tacking, wedges, dogs and strongbacks 19 min · quiz
- 11 Tolerances, distortion allowance and checking a fit 19 min · quiz
- 12 Capstone: laying out and fitting a vessel shell course 19 min · quiz
- E Final exam 20 questions
Requirements
Recommended background. You can start any course at any time.
Description
Layout and fitting for boilermakers, followed through a winter in Ironbridge Industrial's fabrication shop in Port Allen, Louisiana: reading fabrication drawings and welding symbols, layout tools and fractions of an inch, shop geometry, squaring plate and laying out bevels and bolt circles, rolled shell cut lengths, structural shapes, pipe and tube, fitting with dogs, wedges, strongbacks and tacks, and tolerances and weld shrinkage, ending with a capstone that lays out, rolls and fits an ASME pressure vessel shell course through its inspection hold points.