©
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.
