Lap Joint — Study Resources & PYQs
Preparation of a lap joint using arc or gas welding.
- Estimated study time: 30 minutes
Study resources
- Go Practicals - Welding Shop (Lap Joint): Tools & Diagram (Article) — Indian practical-file page for exactly this job: welding shop introduction, tools and accessories, labelled diagram and explanation of the lap joint.
- Our E-Labs - Lap Joint by Arc Welding (procedure) (Article) — The same lab blog also carries the Lap Joint experiment: aim, MS plates, tools list, cleaning, tack welding at both ends, full run and slag removal.
- SlideShare - Arc Welding Lab Manual (lap joint exercise) (Article) — Explains lap joint geometry (one plate overlapping the other) and the fillet weld used to join it - note that a lap joint uses a fillet weld, not a groove weld.
- Virtual Labs - Electric Arc Welding Process (PDF) (PDF) — Use for current setting and electrode selection theory, which is the part of the lap joint viva students most often lose marks on.
- Go Practicals - Carpentry Shop: Tools, Accessories & Diagram (Article) — Indian practical-file style page covering carpentry shop introduction, marking, cutting and paring tools with diagrams. Read this first before attempting any wooden joint - the same tool list is aske…
- Go Practicals - Experiment: Make a T-Lap Joint from Wood (Article) — Ready-made experiment write-up: aim, material, tools, step-by-step procedure, precautions and result. Directly usable as a template for writing the lap joint record in your practical file.
- How to Make a Cross Half Lap Joint by Hand (YouTube) (Video) — Clear hand-tool demonstration of marking the centre line, gauging half the thickness, sawing the shoulders and chiselling the waste. Watch this to understand WHY the two halves sit flush.
- How to Make a T Joint - Carpentry Exercise (NEC Mech, YouTube) (Video) — Indian engineering college workshop demo by a shop technician. Exactly matches the way the job is done and evaluated in an Indian first-year workshop lab.
- Chest of Books - Cross-Lap Joints (step-by-step layout) (Article) — Classic text explaining the marking-out sequence with figures A to G. Very useful for drawing the neat labelled sketch that carries marks in the record book.
- Amity Workshop Practice Manual (ES-107) - Experiment 1 (Article) — Full Indian university lab manual whose Experiment 1 is exactly 'Middle lap T joint, cross lap joint, mortise and tenon T joint'. Includes objective, apparatus, procedure and viva questions.
Taught in these subjects
- WORKSHOP MANUFACTURING PRACTICES — BMEL21 · Government College of Engineering and Technology, Jammu
- Workshop Manufacturing Practices — MEP5212 · Government College of Engineering and Technology, Jammu