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NOIDA INSTITUTE OF ENGINEERING & TECHNOLOGY GREATER NOIDA
PRESENTED BY- GYAN SINGH 1313340068 ME- 5TH (A)
INTRODUCTION OF WELDING AND LASER WELDING
INTRODUCTION OF WELDING
WELDING is a joining process that produces coalescence of materials by heating them to the welding temperature ,with or without the application of pressure alone and with or without the use of filler
material.
TYPES OF JOINT
• Butt Joint • Corner Joint• Tee Joint• Lap Joint• Edge Joint
TYPES OF WELDING ON BASES OF GROOVE
• Straight • Single-V• Single-U • Double-V• Double-V• Single Bevel• Single-J• Double Bevel• Double-J
TYPES OF WELDING
1: Gas Welding(a): Air Acetylene(b): Oxy Acetylene(c): Oxy Hydrogen Welding
2: Arc Welding(a): Carbon Arc welding(b); Plasma Arc welding(c): Shield Metal Arc Welding(d): T.I.G. ( Tungsten Inert Gas Welding)(e): M.I.G. ( Metal Inert Gas Welding)
TYPES OF WELDING
3: Resistance Welding:(a): Spot welding(b): Seam welding(c): Projection welding(d): Resistance Butt welding(e): Flash Butt welding
4: Solid State Welding:(a): Cold welding(b): Diffusion welding(c): Forge welding(d): Fabrication welding(e): Hot pressure welding(f): Roll welding
TYPES OF WELDING
5: Thermo Chemical Welding(a): Thermite welding(b): Atomic welding
6: Radiant Energy Welding(a): Electric Beam Welding(b): Laser Beam Welding
LASER BEAM WELDING
• “Light amplification by stimulated emission of radiation.” • Electrons are atomic particles that exist at specific energy levels. These energy
levels are unique and are different for every atom or molecule.• Electrons in outer rings are at higher energy levels than those in the inner rings. A
flash of light can bump electrons to higher energy levels by the injection of energy. When an electron drops from an outer ring to an inner ring or level, the excess of energy is given off as light. • The wavelength or the color emitted is related to the amount of energy released
LAASER FUNDAMENTAL
Primary Controllable Parameters
• Laser Beam Energy Output Characteristics(i) Voltage (ii) Pulse Duration
• Laser Focus Characteristic(iii) Laser Beam Diameter
CHANGE IN VOLTAGE
Increased voltage results in deeper physical penetration with less melting due to physical pressure
CHANGE IN PULSE DURATION
• Increased pulse duration results in deeper and wider melting
CHANGE IN VOLTAGE AND PULSE DURATION
• Simultaneous increase in voltage and pulse duration results in deeper melting
CHANGE IN BEAM DIAMETER
• Increased beam diameter results in shallow soft penetration and wide, but soft melting
GENERLY USES LASER WELDINGTypical commercial lasers for welding • 1 CO2 Laser• 2 Nd3+:YAG Lasers• 3 Lamp-pumped • 4 LD-pumped• 5 Disk Laser• 6 Diode Laser• 7 Fibber Laser
LASER WELDING MACHINE
•
LASER WELDING MACHINE
LASER WELDING MACHINE
APPLICATION OF LASER WELDING
In auto mobile industriesAerospaceMetal cutting
APPLICATION OF LASER WELDING
APPLICATION OF LASER WELDING
THANK YOU