Welding power point presentation

2. GROUP MEMBERS
Manas Sen 1515
Sovan Santra 1517
Debasish Bar 1533
Sanju Dhara 1566
Ritabrata Aich 1576

3. WELDING
-:What Is Welding:-
join together (metal parts) by heating the surfaces
to the point of melting with a blowpipe, electric arc,
or other means, and uniting them by pressing,
hammering, etc.

4. Transformer
1. Electric Holder
2. Cable Connecter
3. Cable.
4. Electrode
5. Ground Clam
6. Apron etc.

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7. CLASIFICATION OF WELDING
 Arc welding
 Gas Welding
 TIG Welding.
 Plasma Arc Welding.
 Electron Beam and Laser Welding.
 RESISTANCE WELDING

8. The Arc Welding Is A Fusion Welding Process In
Which The Welding Heat (6000°c-
7000°c) Is Achieved By Forming An
Arc Between The Welding
Electrode & The Work piece.
Distance Between Electrode And Work Piece Is
2-3mm.

9. COMPARISON OF A.C and D.C
ARC WELDING
Alternating Current (From
Transformer)
More Efficiency
Cos Of Equipment Is Less
Higher Voltage-Hence Not Safe
Not Suitable For Welding Non Ferrous
Metals
Non Preferred For Welding In Thin
Section

10. COMPERISION OF A.C and
D.C. ARC WELDING
DIRECT CURRENT (From Generator)
 Less Efficiency
 Cost Of Equipment Is More
 Low Voltage –Safe Operation
 Suitable For Both Ferrous And Non-
Ferrous Metal.
 Preferred For Welding Thin Section

11. GAS WELDING
 Gas welding is a process of
construction that involves the use
of gases as well as oxygen to weld
metals together

12. NEUTRAL:-Oxygen & Acetylene
Is Both Are
Same
[Temp-2300°c]
CARBURZING:-Oxygen Less
Then
Acetylene[Temp-2700°c]

14. DIRECTION OF WELDING
In This Welding The Welding Torch Is Hold In The Right Hand &
The
Weld Is Made Right To Left .The Torch Makes An Angle 60°-70°
With
Plate.
In This Method The Welding Torch Is Hold In Right Hand
And
The Weld Is Made Left To Right. The Torch Makes An
Angle 30°-

15. POSITION OF WELDING
Horizontal Overhead
Vertical Inclined

16. Crack [Hot Crack, Cold Crack]
Cavity [Blow Whole,Shrinkege]
In Complete Fusion[Lack Of Fusion,
Penetration]
Solid Inclusion[ Slag, Oxides]
Im Perfect Shape[Under Cut, Under
Fill, Over Lap, Expensive Penetration]

17. CAUSES OF WELDING
DEFECTS
Current Too High
Very Low Current
Use Of A Very Short Arc Length
Welding Speed Too Fast
Wrong Electrode Angle
Long Arc Length
Too Large Electrode
In sufficient Root Gap

18. SAFETY PROTECTION
 ALWAYS wear a proper face shield.
 ALWAYS wear close-toed shoes.
 ALWAYS wear a long-sleeved, non-
flammable shirt.
 ALWAYS wear proper welding gloves.
 ALWAYS wear ear protection