Welding Butt Joint & Lap Joint

Описание: Welding is a process for joining two similar or dissimilar metals by fusion. It joins different metals/alloys, with or without the application of pressure and with or without the use of filler metal. The fusion of metal takes place by means of heat. The heat may be generated either from combustion of gases, electric arc, electric resistance or by chemical reaction.
Welding provides a permanent joint but it normally affects the metallurgy of the components. It is therefore usually accompanied by post weld heat treatment for most of the critical components. The welding is widely used as a fabrication and repairing process in industries. Some of the typical applications of welding include the fabrication of ships, pressure vessels, automobile bodies, off-shore platform, bridges, welded pipes, sealing of nuclear fuel and explosives, etc
Aim: To make a Butt joint using the given two M.S pieces by arc welding.
Material Required:
Mild steel plate of size 100X50X5 mm – 2 No’s
Welding Electrodes: M.S electrodes 3.1 mm X350 mm
Welding Equipment: Air cooled transformer
Voltage-80 to 600 V 3 phase supply, amps up to 350
Tools and Accessories required:
1. Rough and smooth files.
2. Protractor
3. Arc welding machine (transformer type)
4. Mild steel electrode and electrode holder
5. Ground clamp
6. Tongs
7. Face shield
8. Apron
9. Chipping hammer.
Sequence of operations:
1. Marking
2. Cutting
3. Edge preparation (Removal of rust, scale etc.) by filling
4. Try square leveling
5. Tacking
6. Welding
7. Cooling
8. Chipping
9. Cleaning
Aim: To make a Lap joint, using the given two M.S pieces and by arc welding.
Material Supplied:
Mild steel plate of size 100X50X5 mm – 2 No’s
Welding Electrodes: M.S electrodes 3.1 mm X350 mm
Welding Equipment: Air cooled transformer
Voltage-80 to 600 V,3-ɸ supply, Current up to 350Amps
Tools and Accessories required:
1. Rough and smooth files.
2. Protractor
3. Arc welding machine (transformer type)
4. Mild steel electrode and electrode holder
5. Ground clamp
6. Tongs
7. Face shield
8. Apron
9. Chipping hammer.
Sequence of operations:
1. Marking
2. Cutting
3. Edge preparation (Removal of rust, scale etc.) by filling
4. Try square leveling
5. Tacking
6. Welding
7. Cooling
8. Chipping
9. Cleaning