Weldclass WeldForce WF-140ST, Operating Instructions Manual

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4 © Weldclass | E.&O.E. | Edition 1.1 | 2019.05.03
10 GENERAL GUIDE TO WELDING ......................................................................................................... 22
10.1 Duty Cycle Rating ......................................................................................................................... 22
10.2 Choosing a Welding Process – Stick or TIG? ................................................................................. 22
10.2.1 The Stick (MMA) Process ..................................................................................................... 22
10.2.2 The TIG Process .................................................................................................................... 23
10.3 Joint Preparations ......................................................................................................................... 24
11 STICK (MMA) BASIC WELDING GUIDE .............................................................................................. 26
11.1 Size of Electrodes ......................................................................................................................... 26
11.2 Storage of Electrodes ................................................................................................................... 26
11.3 Electrode Polarity ......................................................................................................................... 26
11.4 Effects of Stick (MMA) Welding on Various Materials .................................................................. 26
11.4.1 High Tensile and Alloy Steels ................................................................................................ 26
11.4.2 Manganese Steels ................................................................................................................ 26
11.4.3 Cast Iron ............................................................................................................................... 26
11.5 Types of Electrodes ...................................................................................................................... 27
11.5.1 MILD STEEL: ......................................................................................................................... 27
11.5.2 CAST IRON: ........................................................................................................................... 27
11.5.3 STAINLESS STEEL: ................................................................................................................. 27
11.6 Suggested Settings for Typical Stick (MMA) Applications ............................................................ 27
11.7 MMA Welding Techniques ........................................................................................................... 28
11.7.1 A Word for Beginners ........................................................................................................... 28
11.7.2 The Welder ........................................................................................................................... 28
11.7.3 Striking the Arc ..................................................................................................................... 28
11.7.4 Arc Length ............................................................................................................................ 29
11.7.5 Rate of Travel ....................................................................................................................... 29
11.8 Making Welded Joints .................................................................................................................. 30
11.8.1 Butt Welds ............................................................................................................................ 30
11.8.2 Fillet Welds ........................................................................................................................... 31
11.8.3 Vertical Welds ...................................................................................................................... 32
11.8.4 Overhead Welds ................................................................................................................... 33
11.9 MMA (Stick) Troubleshooting ....................................................................................................... 34
12 TIG BASIC WELDING GUIDE .............................................................................................................. 36
12.1 TIG Electrode Selection and Preparation ..................................................................................... 36
12.1.1 Electrode Polarity ................................................................................................................. 36
12.1.2 Preparing Tungsten for DC Electrode Negative (DCEN) Welding ......................................... 37
12.1.3 Shielding Gas for TIG Welding .............................................................................................. 38
12.1.4 Typical TIG Welding Settings ................................................................................................ 38
12.2 TIG Welding Troubleshooting ....................................................................................................... 39
13 KNOWLEDGE & RESOURCES ............................................................................................................. 40