Reading Assignment
- 32.1 Introduction to Resistance and Solid State Welding
- 32.2 Theory of Resistance Welding
- 32.3 Resistance Welding Processes
- 32.4 Advantages and Limitations of Resistance Welding
- 32.5 Solid-State Welding Processes
Outline
Introduction to Solid-State Welding
Resistance Welding
Basic Resistive Welding
Resistive Welding Temperature Distribution
Tear Test
Advantages Resistance Welding
- Very Rapid
- Can be fully automated
- Conserve material – no flux, filler or shielding gases
- Minimal distortion
- Skill operators not required
- Dissimilar metals can be easily joined
- High degree of relilaility and reproducibility
Limitations of Resistance Welding
- High initial cost for equipment
- Thickness limitations
- Joint design – almost exclusively lap joints
- Access to both sides of the joint is required
- Skilled maintenance personnel required
- Some materials require special preparation
Resistance Welding Processes
- Spot Welding
- Seam Welding
- Tube Welding
- Projection Welding
- Stud Welding
- Flash Welding
Forge Welding
Cold Welding
Roll Welding (roll bonding)
Friction Welding
Inertia Welding
Stir Welding
Advantages of Friction Stir Welding
Metallurgical Benefits
- Excellent weld quality
- Wide range of materials
- Solid-State process
- Low distortion
- High strength
- No loss of alloy elements
- Fine micostructure
- No Cracking
Environmental Benefits
- No shielding gas required
- No surface cleaning required
- No solvent degreasing
- No fumes, gases, or smoke
- Postweld finishing us often unnecessary
- No arc glare or reflected laser beam
Energy Benefits
- Welds produced with far less energy than other processes
- Enable weight reduction
Ultrasonic Welding
Explosive Welding
http://www.youtube.com/watch?v=QDNX6PcKr7I
