1. Nizwa College of Technology
الكلية التقنية بنزوى
Nizwa College of Technology
Mechanical Engineering Department
welding
Done by:
Saravanan & Issa AL-Tobi
Sara $ Issa

2. Welding safety
Before starting actual arc welding the student should be fully aware of the dangers involved. The high temperature arc, hot metal and ultra violet radiations which can cause severe eye irritation and burns.
So students should follow the safety rules very strictly.
Sara $ Issa

3. Definition of welding
“joining of metals by application of heat and/or pressure, with or without the addition of filler metals”
Sara $ Issa

4. Types of Welding Gas welding Arc welding Resistance welding
Tungsten inert gas welding
Metal inert gas welding
Projection welding
Submerged arc welding
Electro slag welding
Sara $ Issa

5. Welding Processes and Materials
Sara $ Issa

6. Weld terminology
Sara $ Issa

7. Types of weld (joint) Butt weld Fillet weld Corner weld Pipe weld
Lap weld
Sara $ Issa

8. GAS WELDING
Sara $ Issa

9. Equipments for gas welding
Sara $ Issa

10. Cylinder and Cylinder Valve
Sara $ Issa

11. Regulator Setting
Sara $ Issa

12. Connecting Hoses
Sara $ Issa

13. Continues…
Sara $ Issa

14. Attaching The Weld Torch
Sara $ Issa

15. Attaching The Weld Torch( Continues)
Sara $ Issa

16. Opening The Gas Knob
Sara $ Issa

17. Igniting the Torch Using Striker
Sara $ Issa

18. Gas Flame
Sara $ Issa

19. Types Of Oxy-Acetylene Gas Flames
Sara $ Issa

20. Gas Flame Zones
Sara $ Issa

21. Gas Welding Equipments
Sara $ Issa

22. Gas Welding Torch
Sara $ Issa

23. Continues…
Sara $ Issa

24. Gas cutting
By changing the weld torch with a gas cutting torch same set up can be used for cutting thick metal plates as shown below.
Sara $ Issa

25. Continues…
Sara $ Issa

26. Gas Cutter Tip
Sara $ Issa

27. ARC WELDING
Sara $ Issa

28. Arc Welding
This is the welding process where required heat is obtained from the electric arc produced between the electrode and the work piece metal.
Types
Manual metal arc welding(stick welding)
TIG welding
MIG welding
SAW welding
Sara $ Issa

29. Equipments of Arc Welding
Creates a thick weld, using a metal rod covered with flux which is called consumable electrode.
AC/DC Transformer is the important equipment
Electrode holder, wire brush, chip hammer.
Sara $ Issa

30. Metal Arc Welding Procedure
Sara $ Issa

31. There are two types of electrode
Electrodes
There are two types of electrode
Consumable electrode (electrode melt and becomes part of the weld)
Non-consumable electrode (electrode does not melt and creates only the arc)
Sara $ Issa

32. Comparison Arc welding Gas welding
-Heat is more
-Electrical power is the source of energy
-We use flux coated electrodes
-Suitable for welding steel
-Heat is less
-Chemical reaction between gases is the source of energy
-We use filler rods
-Suitable for welding copper and brass
Sara $ Issa

33. THE END
Sara $ Issa