Page 7 - Welding of Aluminium and its Alloys

vi Contents

5 Welding design 69

5.1 Introduction 69
5.2 Access for welding 70
5.3 Welding speed 71
5.4 Welding position 72
5.5 Edge preparation and joint design 72
5.6 Distortion 84
5.7 Rectification of distortion 88
5.8 Fatigue strength of welded joints 89

6 TIG welding 97

6.1 Introduction 97
6.2 Process principles 97
6.3 Mechanised/automatic welding 114
6.4 TIG spot and plug welding 115

7 MIG welding 116
7.1 Introduction 116
7.2 Process principles 116
7.3 Welding consumables 130
7.4 Welding procedures and techniques 135
7.5 Mechanised and robotic welding 141
7.6 Mechanised electro-gas welding 143
7.7 MIG spot welding 144

8 Other welding processes 147

8.1 Introduction 147
8.2 Plasma-arc welding 147
8.3 Laser welding 150
8.4 Electron beam welding 155
8.5 Friction welding 160

9 Resistance welding processes 166
9.1 Introduction 166
9.2 Power sources 167
9.3 Surface condition and preparation 169
9.4 Spot welding 171
9.5 Seam welding 175
9.6 Flash butt welding 176