외국인을 위한 CO2용접 기초

Chapter I What is CO2 Arc Welding? Section 1. Outline of CO2 Arc Welding .......................................... 6 1. Principles of CO2 Arc Welding ...................................................... 6 2. Activation of Carbon Dioxide ....................................................... 3 3. Classification of CO2 Arc Welding Process ..................................... 4 4. Advantages of CO2 Arc Welding .................................................. 5 5. Limitations of CO2 Arc Welding .................................................... 5 6. Comparison between Welding Processes ...................................... 6 Section 2. Characteristics of Power Source and Controlling Arc Stability ................................................................. 7 1. Characteristics of Constant Voltage .............................................. 7 Section 3. Metal Transfer Modes .................................................. 8 1. Short Transfer ............................................................................ 8 2. Globular Transfer ....................................................................... 10 3. Spray Transfer ........................................................................... 10 Chapter II CO2 Arc Welding Equipment Section 1 Components and Installation of CO2 Arc Welding Equipment ................................................................... 12 1. Composition of CO2 Arc Welding Equipment .................................. 12 2. Installation of CO2 Arc Welding Equipment ................................... 13 3. Name of CO2 Arc Welding Machine and Operation Procedures ....... 17 4. Preparation and Working Procedures of CO2 Arc Welding ............... 18 Section 2 Disassembly and Assembly of CO2 Arc Welding Torch .. 19 1. Name and Function of Each Part of CO2 Arc Welding Torch ............ 19 2. Torch Assembly Procedures and Precautions in Handling ............... 21 Section 3 Trouble Shooting for CO2 Arc Welding Machine ............ 24 1. Cause and Remedy of Welding Machine Troubles .......................... 24 2. Daily Check Points of Welding Machine ......................................... 27 Chapter III Basic Elements of CO2 Arc Welding Section 1 Selection of Welding Conditions ................................... 28 1. Welding Current ......................................................................... 28 2. Arc Voltage ................................................................................ 30 3. Travel Speed ............................................................................. 32 4. Distance between Tip and Workpiece ........................................... 33 5. Torch Angle and Work Efficiency .................................................. 35 6. Gas Flux, Height of Nozzle and Relationship with Blow Hole .......... 37 Chapter IV Materials for CO2 Arc Welding Section 1 Carbon Dioxide (CO2) .................................................... 39 1. Generals of Carbon Dioxide ......................................................... 39 2. Storage of CO2 Gas .................................................................... 40 Section 2 Wire .............................................................................. 41 1. Solid Wire ................................................................................. 41 2. Flux Cored Wire (FCW) ............................................................... 43 Chapter V Welding Works Section 1 Tack Welding ................................................................ 46 1. General Precautions for Tack Welding ........................................... 46 2. Tack Welding for Butt Joint ......................................................... 46 Section 2 Deposition Method and Welding Procedures ................ 47 1. Deposition Method ..................................................................... 47 2. Welding Sequence .........................................................…

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