WF-255MST
© Weldclass 2019 | E.&O.E. | Edition 2.2 5
10.2.1 The Stick (MMA) Process .....................................................................................................42
10.2.2 The TIG Process ....................................................................................................................43
10.2.3 The MIG Process ..................................................................................................................43
10.3 Joint Preparations.........................................................................................................................44
11 MIG BASIC WELDING GUIDE .............................................................................................................46
11.1 MIG Basic Welding Techniques.....................................................................................................46
11.2 Gas Metal Arc Welding (GMAW) ..................................................................................................46
11.3 Flux Cored Arc Welding (FCAW) ...................................................................................................46
11.4 Position of MIG Torch ...................................................................................................................47
11.5 Distance from the MIG Torch Nozzle to the Work Piece ..............................................................47
11.6 Travel Speed .................................................................................................................................47
11.7 MIG Welding (GMAW) Variables ..................................................................................................48
11.7.1 Preselected Variables ...........................................................................................................48
11.7.2 Primary Adjustable Variables ...............................................................................................48
11.7.3 Secondary Adjustable Variables ...........................................................................................48
11.8 Establishing the Arc and Making Weld Beads ..............................................................................50
11.9 MIG Voltage & Wire Speed Settings .............................................................................................50
11.9.1 Setting Wire Speed/Amperage.............................................................................................50
11.9.2 Setting Voltage .....................................................................................................................50
11.9.3 Changing to a different welding wire ...................................................................................50
11.9.4 How to determine correct Wire Speed/Voltage Setting ......................................................51
11.10 Suggested Settings for Typical MIG Applications .....................................................................51
11.11 Welding wire Size Selection .....................................................................................................51
11.12 MIG Welding Troubleshooting .................................................................................................52
11.12.1 Porosity Problems ................................................................................................................52
11.12.2 Wire Feed Problems .............................................................................................................53
11.12.3 Weld Quality Problems ........................................................................................................54
12 STICK (MMA) BASIC WELDING GUIDE ..............................................................................................56
12.1 Size of Electrodes .........................................................................................................................56
12.2 Storage of Electrodes ...................................................................................................................56
12.3 Electrode Polarity .........................................................................................................................56
12.4 Effects of Stick (MMA) Welding on Various Materials ..................................................................56
12.4.1 High Tensile and Alloy Steels ................................................................................................56
12.4.2 Manganese Steels ................................................................................................................56
12.4.3 Cast Iron ...............................................................................................................................56
12.5 Types of Electrodes ......................................................................................................................57
12.5.1 MILD STEEL: .........................................................................................................................57
12.5.2 CAST IRON: ...........................................................................................................................57
12.5.3 STAINLESS STEEL: .................................................................................................................57
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