BOC Smootharc MMA 170, Operating Manual, Page: 3 / 36

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Welcome to a better way of welding 2
1.0 Recommended Safety Precautions 4
1.1 Health Hazard Information 4
1.2 Personal Protection 4
1.3 Electrical Shock 6
1.4 User Responsibility 6
2.0 Manual Metal Arc Welding Process
(MMAW) 7
2.1 Introduction 7
2.2 Process 7
2.3 Welding Machine 7
2.4 Welding Technique 8
2.5 Electrode Selection 8
2.6 Types of Joints 11
2.7 Fillet Welds 12
2.8 Typical Defects Due to Faulty Technique 15
3.0 Gas Tungsten Arc Welding (GTAW/TIG) 17
3.1 Introduction 17
3.2 Process 17
3.3 Process Variables 18
3.4 Welding Techniques 19
3.5 Shielding Gas Selection 20
3.6 Consumable Selection 21
3.7 Typical Welding Joints for Gas Tungsten
Arc Welding 25
4.0 Machine Specifications and Contents 28
4.1 Operating Controls 28
5.0 Operating Functions 29
5.1 Welding selections 29
5.2 Earthing 29
6.0 Technical Specifications 30
7.0 Periodic Maintenance 31
7.1 Daily Maintenance 31
7.2 Troubleshooting 31
8.0 Terms of Warranty 32
8.1 Terms of Warranty 32
8.2 Limitations on Warranty 32
8.3 Warranty Repairs 32
9.0 Recommended Safety Guidelines 33
Contents