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Welding Processes EN358 – Ship Structures
A Brief History of Welding ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Types of Welding Fusion Welding Pressure Welding Homogeneous Heterogeneous Brazing Soldering Gas Welding Electroslag High Energy Beam Electric Arc MIG TIG Shielded Metal Arc – “Stick” Friction Welding
Weldability of a Metal ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Fusion Welding Principles ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Fusion Welding BASE METAL WELD SOLIDIFIED SLAG ARC POOL WELDING ATMOSPHERE CORE WIRE ELECTRODE COATING ARC STREAM PENETRATION DEPTH
Weld Metal Protection ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Weld Fluxes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Inert Gases ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Vacuum  ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Types of Fusion Welding ,[object Object],[object Object],[object Object],[object Object]
Oxyacetylene Welding ,[object Object],[object Object],[object Object],Inner Cone: 5000-6300 deg F Combustion Envelope 3800 deg F 2300 deg F TORCH TIP
Shielded Metal Arc (Stick) ,[object Object],[object Object],[object Object]
Shielded Metal Arc (con’t) ,[object Object],[object Object],[object Object],[object Object],[object Object]
Inert Gas Welding ,[object Object]
[object Object],[object Object],Metal Inert Gas (MIG) BASE METAL PUDDLE POWER SOURCE DRIVE WHEELS CONSUMABLE ELECTRODE ARC COLUMN SHIELDING GAS
[object Object],[object Object],[object Object],Tungsten Inert Gas (MIG) BASE METAL PUDDLE POWER SOURCE ARC COLUMN SHIELDING GAS TUNGSTEN ELECTRODE + + BASE METAL (ANODE) TUNGSTEN ELECTRODE (CATHODE) - - - + +
Welding Positions FLAT HORIZONTAL VERTICAL OVERHEAD INCREASING DIFFICULTY
Weld Defects ,[object Object],[object Object],[object Object],[object Object],[object Object]
Weld Defects ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Residual Stresses ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Joint Design BUTT JOINT STRAP JOINT LAP JOINT FILLET JOINT CORNER JOINT
Generalized Welding Symbol FAR SIDE DETAILS ARROW SIDE DETAILS Field weld symbol Weld all-around for pipes, etc. L1-L2 L1-L2 D = Weld Depth (usually equal to plate thickness) L1 = Weld Length L2 = Distance between centers for stitched welds The Field Weld Symbol is a guide for installation. Shipyards normally do not use it, except in modular construction.  Electrode Material D D Weld Geometry
Example Welding Symbol 1/2”  1/2” 1/2 1/2 One-sided welds are max 80% efficient Two sided are 100% efficient Geometry symbol for V-groove
Weld Symbols (Butt Joints) Backing
Weld Symbol (Fillet Joints)
Weld Symbol (Corner Joints)

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Welding

  • 1. Welding Processes EN358 – Ship Structures
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  • 3. Types of Welding Fusion Welding Pressure Welding Homogeneous Heterogeneous Brazing Soldering Gas Welding Electroslag High Energy Beam Electric Arc MIG TIG Shielded Metal Arc – “Stick” Friction Welding
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  • 6. Fusion Welding BASE METAL WELD SOLIDIFIED SLAG ARC POOL WELDING ATMOSPHERE CORE WIRE ELECTRODE COATING ARC STREAM PENETRATION DEPTH
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  • 18. Welding Positions FLAT HORIZONTAL VERTICAL OVERHEAD INCREASING DIFFICULTY
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  • 22. Joint Design BUTT JOINT STRAP JOINT LAP JOINT FILLET JOINT CORNER JOINT
  • 23. Generalized Welding Symbol FAR SIDE DETAILS ARROW SIDE DETAILS Field weld symbol Weld all-around for pipes, etc. L1-L2 L1-L2 D = Weld Depth (usually equal to plate thickness) L1 = Weld Length L2 = Distance between centers for stitched welds The Field Weld Symbol is a guide for installation. Shipyards normally do not use it, except in modular construction. Electrode Material D D Weld Geometry
  • 24. Example Welding Symbol 1/2” 1/2” 1/2 1/2 One-sided welds are max 80% efficient Two sided are 100% efficient Geometry symbol for V-groove
  • 25. Weld Symbols (Butt Joints) Backing