Unit 1 What Is a Material
Unit 2 Classification of Materials
Unit 3 Metals and Their Use
Unit 4 Properties of Metals
Unit 5 Kind of Steel
Unit 6 Lathe
Chapter 2 Welding
Unit 1 What Is the Welding
Unit 2 Classification of Welding Processes
Unit 3 Fusion Welding
Unit 4 Shielded Metal Arc Welding
Unit 5 Gas Metal Arc Welding
Unit 6 Gas Tungsten Arc Welding
Unit 7 CO2 Welding
Unit 8 Submerged Arc Welding
Unit 9 Resistance Welding
Unit 10 Cutting
Chapter 3 Inspection
Unit 1 Radiographic Examination
Unit 2 Ultrasonic Examination
Chapter 4 Heat Treatment
Unit 1 What Is the Heat-Treating
Unit 2 Phase Transformations in Heating Steel
Unit 3 Features of Super-Cooled Austenite Transformation（TTT Diagrams）
Unit 4 Hardening of Steel
Unit 5 Normalizing of Steel
Unit 6 Surface Treatments-Carburizing
Unit 7 Carburizing Processes
Unit 8 Primary Equipment of Heat-Treating
Unit 9 Vacuum Treating
Unit 10 Temperature Control in Heat-Treating
References
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