Senior Secondary Technology Curriculum. SS 2 Metal Work Scheme of Work Federal. Consumable electrode –Schemeofwork.com
METAL WORK SS2 TEACHING SCHEME FIRST TERM
| WEEK | TOPIC AND CONTENT | ACTIVITIES |
| 1 | Metal joining processes, Explanation of temporary metal joining processPermanent metal joining process 2 identification of commonfastener and their uses: -boit -Nuts -pris and scrers etc. -Riveting | The teacher Defines the temporary and permanent methods of joining metals together. -Cut mild steel plate and drill through the two pieces and use boit and nut to assemble them. |
| 2 | Permanent metal joining process Soldering:- Hard and soft soldering. Tools and equipment. Soldering:- (I)Soft soldering (II) Hard soldering (III)Soldering Tools And Equipment. (IV)soldering operations (V)Flux. | Students Should demonstrate riveting operation soldering is explained to be the permanent method of joining metals together with solder. The solder meits at the temperature lower than the filler metals. They explain on how soldering iron is used with flux for soldering operations. |
| 3 | Brazing, Definition of brazing (I) Dip (ii)Furnace (iii) Inflamed Resistance (vi) Torch. . | The students cut a thin mild steel plate (10x 10 x 1)mm. 2piecs and use SQ brass rod to lab them together using furnace or oxy– acetylene flame. For brazing. |
| 4 | Torch brazing, Materials, tools and equipment | Demonstrate the brazing operation by using sheet of metals in the workshop oxy-acetylene flame to joint the pieces of metals (operant metals together) |
| 5 | Introduction to welding, -Importance of welding basics -welding groups and processes -method of applying welding . | Define welding as the permanent methods of joining two or more metals together. State the important of welding in the society. Students should group the welding into semi automatics and automatics. ARC welding- students should prepare their work piece prio to welding . |
| 6 | Gas welding C oxyacetylene welding (OAW) principle., Oxy-acetylene welding system Low pressure system.(2)High pressure system | Explains the principle of gas welding system. State the difference between high pressure and low pressure acetylene welding system. Demonstrate on how gas welding operation in carried out in the workshop. State about 10 safely preventions that must be observed in the workshop when using low pressure and high pressure acetylene system. |
| 7 | Oxy-acetylene welding equipment. -cylinders. -Blowpipe -Rubber lose. -Regulators etc. | Introduce students to oxy-acetylene welding equipment and explain the hazards involves in the operation -Explains the function of pressure regulating ganged and the function of the blowpipe. -Explains the flash back arrestor is attach to the hose to present flash back. |
| 8 | OXY- acetylene Welding flame. Natural flame oxidizing flame Carbonizing flame Back fire and flash back Welding method (i)leftward welding (ii)Right word welding | Define the three type of flame to student and state their uses. Student should then use spark higher to rekindle the flame and adjust the flame to the three types of flame . The teacher ask the students to cut the base metal prepare the edge and demonstrate the welding operation with the filler rod and the role in progressing to work left. -Right ward welding the operation progresses toward right. |
| 9 | Joints: A Butt, lap, tee joint etc. B Defect in oxy-acetylene welds -Definition of defects. | The teacher interacts students to cut base metals for the practical purpose. And form the following joint, Butt, Lap, Tee joint. The teacher mentions different defect in welding joints and defined them. E.g. blow hole , cupping, cracking of the weld. |
| 10 | Temporary joining process, -Mechanical fasteners -Definition of screw thread -screw thread terms -Principal ports of an external screw thread -Uses of screw thread How screw thread are produced. Hand tools Power machine tools | Describe screw thread as mechanical fasteners, Present mild steel rood to student in the metals work shop and cut it to a defined dimension, fixe it in the chuck of a lathe machine and thread it for students to see. The teacher them instruct the students to perform the same operation on the lathe. Students should define screw thread terms e.g. numeral character,. Pitch etc-state the differences between hand and machine tool with the stated example. Hammer, mallet, screw driurs as hand tools.Machine tools are powered |
| 11 | Form of screw thread, square thread | Electricity e.g. power lack saw, drilling machines etc. |
| 12 | Form of screw thread, SQUARE THREAD ACME, thread Buttress thread | Use chart to demonstrate the screw thread form. Mention and sketch some screw thread and state where they should be used. |
| 13 | Revision | Revision |
| 14 | Examination | Examination |
Senior Secondary Technology Curriculum. SS 2 Metal Work Scheme of Work Federal. Consumable electrode –Schemeofwork.com
METAL WORK SS2 TEACHING SCHEME SECOND TERM
| WEEK | TOPIC AND CONTENT | ACTIVITIES |
| 1 | arc welding, Definition of arc welding. Basic types of arc welding. (i)Non consumable electrode arc welding. (ii) Consumable electrode arc welding. | The teacher Defines arc welding and write down the principle involved in establishing the arc. Mention basic types of arc welding and give students work pieces of a given dimension with an electrode to weld a butt joint. |
| 2 | Consumable electrode arc overcalling, Definition of arc welding -maintenance of the arc. -metal transfer across the arc. | The teacher Defines arc welding. students scratch the electrodes on the parent metal with draw it to a height arc length (1.5m) and maintains it at that length through out the weld. |
| 3 | Shielded metal arc welding (swam), -principle of operation -SMAW equipment (I) D.c transformer. (ii)Electrode holder (iii)Flexible cable electrode. | Explain the principle of operation of (SMAW) Show the SMAW equipment to students and ask them to put them into use in the workshop -Using electrode connected to the electrode holder. -connect the electrode holder to the feasible able which leads directly into the transformer. The D.C. State the source of supply of the AC -Explain how rectifier reduces the AC connect to the welding connect. |
| 4 | Striking the arc, Taping method Scratching method. | In order to establish an:-There are two methods which involves touching the electrode with the base metal and with drawing it to a length for the arc to be established scratching motion involves scratched the electrode on the parent metal in the motion the marches is being scratched. |
| 5 | Electrodes, Function of electrode coating Classification of electrode | State that the flux coating prevents the weld from at mospheric contamination and for protective should on the weld. Classify electrodes according to welding conditions. |
| 6 | Essential factors for maintaining high quality weld. -Connect electrode type -connect electrode size -connect current -connect arc length -connect travel speed -connect electrode angle -connect manipulation of spatter. | In maintaining high quality weld student must select connect size of electrode to suit connect .maintaining the speed of the weld and angle inclination of the electrode. |
| 7 | Arc welding position , Arc welding joint , Over-head welding Vertical welding Horizontal welding. | Explain the welding position and state the factors that governs the process -place mild steel plate of specified size for student to weld in horizontal position, overhead position and overhead position |
| 8 | Riverts, -types and use -sheet metal work -Hard work -machine work. | Teacher mentions the various types of rivet and state their uses and where they are important State the advantage of rivet joints students should produce various rivet and drill mild steel plate to have a round hole the hammer them together to have a rivet joint by loud. Use also machine to loud machine rivet. |
| 9 | Basic sheet metal work hand tools and equipments. Sheet metal work operation:- Cutting tools:- Hand shares (snips) Bench shares Bench tools: stakes, Bick, iron, Hammer, Mattets etc. Machine for sheet metal work Gillotine, Bending Rollers, universal jenny folding machine -Bending -Flanging -wiring (B) Sheet metal work joints. -Grooved seam, paned down know up, ship on joint and ship in joint | Demonstrate the cutting of sheet metals using guillotine, use bending rollers to bend the sheet metal. Ask students to use universal jenny folding machine folding student should use hammer and mallets to beat the folded metals to shape for finishing. |
| 10 | Pattern development (A)method of pattern development radial line, triangulation parallel line (B)types of pattern:-rectangular, plain, cylindrical, conical section.etc. -cylindrical calendaring -internal gridding and surface grinding. | Cut their sheet of mild steel plate and flanch the edge bend, the edges for safety and use wire for rounding up the bottom. And mallet it down. to shape (wired edge) |
| Work out the bending allowance for the know up joints, bend the metal to the shape required and use ships to cut the excess metal away for tarnishing. | ||
| Explain method of pattern development state types of patterns used for plain, cylindrical and conical sections etc. -Develop simple patterns of shape using parallel lines radial and triangulation method and transfer it to the work piece. Demonstrate the grinding operation using the grinding disk for both internal and external surface. | ||
| 11 | Revision | Revision |
| 12 | Examination | Examination |
Senior Secondary Technology Curriculum. SS 2 Metal Work Scheme of Work Federal. Consumable electrode –Schemeofwork.com
METAL WORK SS2 TEACHING SCHEME THIRD TERM
| WEEK | TOPIC AND CONTENT | ACTIVITIES |
| 1 | Heat treatment, Definition of heat treatment,Heat treatment processAnnealing (iii) Normalizing (iv) Hardening Case Hardening Tempering etc. | Teachers should state the important of heat –treatment of metals Students should explain heat –treatment in terms of changing the grain structure of the metal in order to refine its grain. Heating temperature and the mode of heating and quenching should be very important depend on the type of heat-treatment. |
| 2 | Materials and equipment for heat-treatment,Materials:- Coal, brine, water, air, oil etcEquipment:- Furnace, pyrometers, oven, quenching talks. etc | List material and equipment used for heat-treatment of metals. Explains the function and equipment used for heat-treatmentsState the coaling and heating equipment and how they are used. |
| 3 | Forging,Definition of forgingImportance of forgingMethod of forgingHand forgingDrop forgingMachine forging | Define forging as the process of heating and hammering metals to require shape. State types of forging and important of forging metals work shape. |
| 4 | Hand equipment,A EquipmentsForgeThe anvilThe ViceSwage B Tools HammersTongsCold set and HardiesHot set and hardies | Heat a piece of wild steel plate in the forging or Black smith furnace. -Use tong to hold the hot metals to the vice or anvil and ask student to hammer the piece of metal to shape. |
| 5 | Hand forging operations, Up setting Drawing down Setting down Bending Punching and drifting etc. | Explain the process of various forging operations. List at least 4 types of forging operation and explain two Demonstrates various forging operations organize a visits local black smith work shop. For sites seeing. |
| 6 | Stick cutoff machine (i)power hack saws (ii)Horizontal band saws -Definition of stick cutoh machine -Four kinds of stick cutoh machines (i)power Hack saws (ii)Horizontal band saws cold saws Abrasive cutoh saws. | Describe the process of sawing, name tools and equipment used for power sawing guide students to perform power sawing operation successfully. List tools and machines for power sawing |
| 7 | The lathe and the lathe operations, Basic cutting operations -size of lathes and their functions . (i)Turret lathe (ii)capstan lathe. | Describe the machine, identity the various part of the lathe and state their function . Describe the at lest four operations carried out in the lathe -state at last 7 safety precautions e.g. turning and falling . |
| 8 | Lath cutting tools and tool holders. Cutting tools and tools holders cutting speed for the lath. | Describe right hand and left round cutting tools. Explain functions of these cutting tools e.g. slotting tools. Explains cutting speed and solve the problem on the cutting speed. |
| 9 | The shaping machine /part of shading machine -Quick – return machine -cutting speed -work holding -tools and tolls holding | State that the direction of rotation of the milling cutter is anti-clock wise State various operation performed on the milling machine such milling, climb milling, ends milling and milling. |
| 10 | Milling machine -Definition -Basic milling operation -classification of the milling machine and their main ports. Milling cutter, Direction of rotation and feed work holding. | Define the universal dividing head as being used for cutting various gears Explain the in term index and use the formula for the gear calculation. |
| 11 | The universal dividing heads (milling machine) Universal head indexing | |
| 12 | Revision | Revision |
| 13 | Examination | Examination |
