28-12-2012, 04:25 PM
Welding Processes and Technology
Welding Processes and Technology.ppt (Size: 659 KB / Downloads: 137)
Soldering and Brazing
Advantages
Low temperature heat source required
Choice of permanent or temporary joint
Dissimilar materials can be joined
Less chance of damaging parts
Slow rate of heating & cooling
Parts of varying thickness can be joined
Easy realignment
Strength and performance of structural joints need careful evaluation
Welding
Advantages
Most efficient way to join metals
Lowest-cost joining method
Affords lighter weight through better utilization of materials
Joins all commercial metals
Provides design flexibility
WELDABILITY OF STEELS
Cracking & Embrittlement in Steel Welds
Cracking
Hot Cracking
Hydrogen Assisted Cracking
Lamellar Tearing
Reheat Cracking
Embrittlement
Temper Embrittlement
Strain Age Embrittlement