1. Applications gas welding (oxyacetylene) for plate
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Applications gas welding (oxyacetylene) for plate

2. Types of Welded Joints Butt joint Corner joint Edge joint Lap joint
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3. Types of Welded Joints
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4. Square Butt Joints Used to butt weld light sheet metal
1/16 to 3/16 thick metal
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5. Beveled Butt Joints Used to butt weld heavier pieces of metal together
3/8 to ½ inch metal can welded using a single V or U joint.
½ Inch metal and up can be welded using a double V or U joint
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6. Beveled Cont.
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7. Corner Joints
Used to join to pieces of metal that are approximately right angles to each other
Closed corner joint is used on light sheet metal were strength is not a required at the joint
Half open corner joint is used on heavier metal when welding can only be done on one side. Used when load is not severe
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8. Corner Cont.
Open corner joint is used on heavy material. It is the strongest of the corner joints
Corner joints on heavy material are welded on both sides. The outside first them reinforced on the inside
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9. Corners Cont.
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10. Edge Joints
Used to join two parallel or nearly parallel pieces of metal. Not very strong
Used mainly to join edges of sheet metal, reinforce flanges of I beams, and mufflers
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11. Edge Joints
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12. Lap Joints Used to join two overlapping pieces of metal
Single lap joint welded from one side
Single lap joint welded from two sides develops full strength
Off set lap joint is used when two pieces of metal need to be joined in the same plain
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13. Lap Joints Cont. A- single lap joint, one weld
B- single lap joint, two welds
C- offset lap joint
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14. Tee Joints
Used to join two pieces of metal that are approximately 90 degrees to each other, but the surface of one piece of metal is not in the same plain as the other metal
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15. Tee Joints Cont. A- plain tee B- single beveled C- double beveled
D- single J
E- double J
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16. Types of Welds
Fillet weld- basic weld used. Used when joining two pieces of metal without preparing the surface of the metal first
Groove weld- basic weld, used when preparing the metal before welding it into place
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17. Fillet Welds
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18. Groove Welds
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19. Gas welding
Sound weld is obtained by selecting proper size of flame, filler material and method of moving torch
The temperature generated during the process is 33000c
When the metal is fused, oxygen from the atmosphere and the torch combines with molten metal and forms oxides, results defective weld
Fluxes are added to the welded metal to remove oxides
Common fluxes used are made of sodium, potassium. Lithium and borax.
Flux can be applied as paste, powder,liquid.solid coating or gas.
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20. Gas welding equipment 1. Gas Cylinders Pressure Oxygen – 125 kg/cm2
Acetylene – 16 kg/cm2
2. Regulators
Working pressure of oxygen 1 kg/cm2
Working pressure of acetylene 0.15 kg/cm2
Working pressure varies depends upon the thickness of the work pieces welded.
3. Pressure Gauges
4. Hoses
5. Welding torch
6. Check valve
7. Non return valve
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21. Oxy-Acetylene welding
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22. Types of flames
Oxygen is turned on, flame immediately changes into a long white inner area (Feather) surrounded by a transparent blue envelope is called Carburizing flame (30000c)
Addition of little more oxygen give a bright whitish cone surrounded by the transparent blue envelope is called Neutral flame (It has a balance of fuel gas and oxygen) (32000c)
Used for welding steels, aluminium, copper and cast iron
If more oxygen is added, the cone becomes darker and more pointed, while the envelope becomes shorter and more fierce is called Oxidizing flame
Has the highest temperature about 34000c
Used for welding brass and brazing operation
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23. Neutral flame
Three basic types of oxyacetylene flames used in oxy fuel gas welding
operations:
neutral flame;
oxidizing flame;
carburizing, or reducing flame.
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24. Oxidizing flame
Three basic types of oxyacetylene flames used in oxy fuel gas welding
operations:
neutral flame;
oxidizing flame;
carburizing, or reducing flame.
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25. Carburizing or reducing flame
Three basic types of oxyacetylene flames used in oxy fuel gas welding
operations:
neutral flame;
oxidizing flame;
carburizing, or reducing flame.
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26. Welding
Welding is a materials joining process which produces coalescence of materials by heating them to suitable temperatures with or without the application of pressure or by the application of pressure alone, and with or without the use of filler material.
Welding is used for making permanent joints.
It is used in the manufacture of automobile bodies, aircraft frames, railway wagons, machine frames, structural works, tanks, furniture, boilers, general repair work and ship building.
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27. PROSES LAS BRAZING
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28. PERALATAN BRAZING
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29. SAMBUNGAN BRAZING
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30. PIPE BRAZING
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31. SAMBUNGAN BRAZING
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32. PIPE BRAZING
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33. MACAM SAMBUNGAN
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34. Gas welding process
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35. Gas welding application
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36. Review how much Types of flames ? What are the the types of joints?
What is the strongest of the corner joints?
Name the two types of welds we will use?
how much Types of flames ?
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37. Study Hard
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