© COPYRIGHT 1998 THE ESAB GROUP, INC. LESSON II APPENDIX A LESSON II - GLOSSARY OF TERMS Arc Blow -  Deviation of the direction of the welding arc caused by magnetic fields in the work piece when welding with direct current. Straight Polarity -  Welding condition when the electrode is connected to the negative terminal and the work is connected to the positive terminal of the welding power source. Reverse Polarity -  Welding condition when the electrode is connected to the positive terminal and the work is connected to the negative terminal of the welding power source. Slag -  The brittle mass that forms over the weld bead on welds made with coated electrodes, flux cored electrodes, submerged arc welding and other slag producing welding processes.  Welds made with the gas metal arc and the gas tungsten arc welding processes are slag free. Manual Arc Welding -  Welding with a coated electrode where the operator's hand controls travel speed and the rate the electrode is fed into the arc. Semi-Automatic Welding -  Welding with a continuous solid wire or flux cored electrode where the wire feed speed, shielding gas flow rate, and voltage are preset on the equipment, and the operator  guides the hand held welding gun along the joint to be welded. Slag Inclusion -  A weld defect where slag is entrapped in the weld metal before it can float to the surface. Root Pass -  The initial pass in a multi-pass weld, usually requiring 100% penetration.
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Lesson 1
The Basics of Arc Welding
Lesson 2
Common Electric
Arc Welding Processes
Lesson 3
Covered Electrodes for Welding
Mild Steels
Lesson 4
Covered Electrodes for Welding Low Alloy Steels
Lesson 5
Welding Filler Metals for Stainless Steels
Lesson 6
Carbon & Low Alloy
Steel Filler Metals -
GMAW,GTAW,SAW
Lesson 7
Flux Cored Arc Electrodes Carbon Low Alloy Steels
Lesson 8
Hardsurfacing Electrodes
Lesson 9
Estimating & Comparing Weld Metal Costs
Lesson 10
Reliability of Welding Filler Metals