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Repair by Welding - Coggle Diagram
Repair by Welding
Welding processes
Manual metal arc (MMA)
Flux cored arc welding (FCAW)
Metal active gas (MAG)
Tungsten inert gas (TIG)
Oxyacetylene welding
Metal inert gas (MIG)
Types of defects
Service failures.
fatigue
brittle fracture
stress corrosion
Fabrication defects.
undercut
lack of fusion
slag inclusions
incomplete penetration
porosity
solidification cracking
hydrogen induced cracking
lamellar tearing
Metal removal
Mechanical methods
rotary tungsten carbide burrs
grinding
pneumatic chisels
Thermal
oxyacetylene gouging
oxygen-arc
air-arc gouging
General techniques for typical repairs
Groove shape
minimum amount of metal removed
wide enough for access
can cost up to ten times as much as depositing similar quantities of weld metal correctly in the first place