chaitra-1.pptx fake news detection using machine learning
Welding power point presentation
1.
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.
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
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°-
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