Unit 1 Basic Metallurgy of fusion welds

15 lecture hours

• 1.1 Introduction of welding metallurgy 1.2 Welding arc 1.3 Heat flow in and around weld metal 1.4 Metallurgical effects of welding 1.5 Weld metal solidification 1.6 Absorption of gases by weld 1.7 Gas metal reactions 1.8 Porosity in weld 1.9 Slag inclusion and slag metal reaction 1.10 Fe-C
• T.T.T. and C.C.T. diagrams 1.11 Different micro constituents observed in welding 1.12 Thermal effects of welding on parent metal and its mechanical properties 1.13 Effect of welding parameter on weld quality 1.14 Hydrogen embrittalment and cracking 1.15 Grain size control 1.16 Weld cracking 1.17 Corrosion of weld 1.18 Dilution 1.19 Effect of alloying elements on tensile strength of weld metal 1.20 Lamellar Tearing 1.21 Reheat cracking

Unit 2 Weldability of carbon steel

6 lecture hours

• 2.1 Weldability of carbon steel 2.2 Weldability of low carbon steel 2.3 Weldability of medium carbon steel 2.4 Weldability of high carbon steel 2.5 Weldability of high strength low alloy (HSLA)steels 2.6 Weldability of low alloy steels Program Name: Diploma Engineering Level: Diploma Branch: Fabrication Technology Subject Code: DI05055031 Subject Name: Welding Metallurgy 2.7 WPS preparations per ASME Section IX for carbon steel

Unit 3 Weld ability of stainless steel and Green Hydrogen Infrastructure

9 lecture hours

• 3.1 Introduction of green hydrogen and scopes of green hydrogen production infrastructure development in Gujarat 3.2 Use of Stainless steel in green hydrogen production infrastructure 3.3 Types of stainless steel 3.4 Welding of Austenitic stainless steel 3.4.1 Electrode and filler metal 3.4.2 Welding procedure 3.4.3 Weld metal 3.4.4 Schaeffler diagram 3.4.5 Delong diagram 3.5 Problems associated with welding of Austenitic stainless steel 3.5.1 Ferrite and Sigma phase formation 3.5.2 Carbide precipitation 3.5.3 Remedies of carbide precipitation 3.5.4 Knife edge attack 3.5.5 Stress corrosion cracking 3.6 PWHT of Austenitic stainless steel weldments. 3.7 Weld ability of Ferritic stainless steel 3.8 Preheat & PWHT of Ferritic stainless steel weldments 3.9 Weldability of Martensitic stainless steel 3.10 Preheating and PWHT of MSS weldments 3.11 Weldability of PH stainless stee 3.12 Weldability of Duplex Stainless Steel 3.13 WPS preparation as per ASMESEC-IX stainless steel

Unit 4 Weldability of Aluminum & its alloys

7 lecture hours

• 4.1 Characteristics and application of Aluminum 4.2 Welding characteristics of Al& its alloys 4.3 Processes used for welding Aluminum & its alloys 4.4 Problems encountered in welding of Aluminum Weldability of Titanium &its alloys 4.5 Characteristics of Titanium 4.6 Titanium alloys 4.7 Welding of Titanium and its alloys 4.8 Welding processes and procedure used for Titanium welding 4.9 Joint design selection
• selection of preheat and interpass temperature
• Protection during Titanium welding
• Welding process selection
• PWHT 4.10 Problems associated with welding of Titanium

Unit 5 Residual welding stresses and distortion 8 18

• Program Name: Diploma Engineering Level: Diploma Branch: Fabrication Technology Subject Code: DI05055031 Subject Name: Welding Metallurgy 5.1 Definition and concept of residual stresses 5.2 Types of residual stresses 5.3 Residual stresses in welds 5.4 Effects of thermal stresses 5.5 Control of residual stresses 5.6 Need for residual stress relieving 5.7 Methods of residual stress relieving 5.8 Concept of distortion 5.9 Types of distortion 5.10 Control of welding distortion 5.11 Effect of metal properties on welding distortion