The Missing Math Workbook for Pipe Welders and Pipefitters.
Master rolling offsets, pipe schedules, take-offs, coping cuts, heat input, and fabrication layout with 210 worked examples, 500 practice problems, and a complete stepped-solution answer key.
If you can weld a root pass in your sleep but freeze when the foreman asks for a 45-degree rolling offset on a 6-inch schedule 40 spool — this workbook fixes that.
Pipe-welding math is a small, well-defined subset of arithmetic, fractions, and right-triangle trigonometry. This 200-page workbook gives you that subset in the format working pipe welders, pipefitters, and welder-fitters actually need it — built around 19 focused chapters and a tear-out formula card.
The math you’ll actually use:Fractions, decimals, and tape-measure reading down to 1/32″ — fluency drills, not theoryImperial / metric conversion (in ↔ mm, ksi ↔ MPa, °F ↔ °C, NPS ↔ DN)Pipe dimensions — NPS, OD, ID, wall thickness, schedule (Sch 40, 80, 160, XXS) per ASME B36.10Bevel and cope layout — included angle, side angle, land, surface length, wrap-around templatesPipe takeoffs — 90°, 45°, 22.5°, 60° per ASME B16.9 butt-weld fittingsSimple offsets (45°, 22.5°, 11.25°, 30°, 60°) with the multiplier-method shortcutRolling offsets — the Pythagorean substitution, the roll angle, the real-job variationsCutback calculations for defect repair and thermal-expansion compensationHeat input — AWS D1.1 Clause 6 and ASME IX QW-409 formulas, with η process efficiency factorsPreheat and interpass temperature — AWS D1.1 Table 3.2 plus the carbon-equivalent (CE) calculationFiller-metal consumption — deposition efficiency, weld-groove cross-section, rod-count per jointTime, arc-on-time, and operating factor — the math that turns a deposit rate into a clock-hour bidFull cost estimation — fully-loaded labor rate, the margin-on-revenue vs margin-on-cost mistakeHow it’s organized:19 chapters grouped into six parts — Foundation Math, Pipe Geometry, Layout Math, Procedure Math, Business Math, Reference & Review210 worked examples in GIVEN / FIND / STEPS / ANSWER format — read one, do the next500 practice problems graded easy-to-hard within every chapterFull stepped-solution answer key — every problem, every step (no “see appendix B” cop-outs)3-tier final review (40 problems × 3 difficulty levels) that simulates NCCER journey-level math finals, UA apprenticeship exams, and state-licensed-contractor math sectionsPull-out FORMULA REFERENCE CARD with every equation in the book on one pageWho this workbook is built for:Pipe welders preparing for the 6G, NCCER, or UA apprenticeship math finalsPipefitter apprentices and welder-fitters who do takeoffs, offsets, and copes on the jobApprentices whose math fundamentals were never finishedForemen and instructors training new handsWelder-contractors and estimators who bid jobs and need to stop losing money on the wrong margin formulaTechnically reviewed by David A. Henderson, AWS Certified Welding Inspector (#18-12847), with 32 years of pipeline and refinery welding experience. Every formula validated against AWS D1.1, ASME B36.10, ASME B16.9, and AWS B2.1.
Book 2 of The Pipe Welder’s Toolkit Series. Book 1 (6G Pipe Welder Certification Study Guide) gets you the cert. This book gets you the takeoffs, offsets, and procedure math the cert assumed you already knew. Book 3 (Welding Symbols & WPS Pocket Reference) gets you through every weld decision after.
Pipe costs money. Bad math costs more. Do the math once. Cut once.
