Tweco 141i Fabricator - Manual (Page 71)

Fabricator 141i
Manual 0-5145 4-11 BASIC WELDING GUIDE
Copper and Alloys
The most important factor is the high rate of heat conductivity of copper, making pre-heating of heavy sections
necessary to give proper fusion of weld and base metal.
Types of Electrodes
Arc Welding electrodes are classified into a number of groups depending on their applications. There are a great
number of electrodes used for specialized industrial purposes which are not of particular interest for everyday
general work. These include some low hydrogen types for high tensile steel, cellulose types for welding large
diameter pipes, etc The range of electrodes dealt with in this publication will cover the vast majority of applications
likely to be encountered; are all easy to use.
Arc Welding Practice
The techniques used for arc welding are almost identical regardless of what types of metals are being joined.
Naturally enough, different types of electrodes would be used for different metals as described in the preceding
section.
Welding Position
The electrodes dealt with in this publication can be used in most positions, i.e. they are suitable for welding in
flat, horizontal, vertical and overhead positions. Numerous applications call for welds to be made in positions
intermediate between these. Some of the common types of welds are shown in Figures 4-11 through 4-18.
Art # A-07687
Figure 4-11: Flat Position, Down Hand Butt Weld
Art # A-07688
Figure 4-12: Flat Position, Gravity Fillet Weld
Art # A-07689
Figure 4-13: Horizontal Position, Butt Weld
Art # A-07690
Figure 4-14: Horizontal-Vertical (HV) Position