Speedaire SDR8CG00 Manuel D'utilisation Et De Pièces page 18

WELDER GUIDELINES (CONTINUED)
NOTE: Weld bead
width (W) should be
approximately twice
the diameter for the
electrode rod used.
Normal Amps, Arc
Length, Speed
Amperage Too Low
Amperage Too High
Figure 8 - Weld Appearance
Weld Angle
Weld angle is the angle at which the electrode is held during the welding
process. Using the correct angle ensures proper penetration and bead
formation. Electrode angle involves two positions - travel angle and work
angle (See Figure 9).
Travel angle is the angle in the line of welding and may vary from 5º to 45º
from the vertical, depending on welding conditions.
Work angle is the angle from horizontal, measured at right angles to the line
of welding.
For most applications, a 45º travel angle and 45º work angle is sufficient.
For specific applications, consult an arc welding handbook.
NOTE: Right handed welders should weld from left to right. Left handed
welders should weld from right to left. The electrode should always point
into the weld puddle as shown.
Welding Positions
Four basic welding positions can be used; flat, horizontal, vertical, and
overhead. Welding in the flat position is easier than any of the others
because welding speed can be increased, the molten metal has less
tendency to run, better penetration can be achieved, and the work is less
fatiguing. Other positions require different techniques such as a weaving
pass, circular pass, and jogging. A higher skill level is required to complete
these welds. All work should be performed in the flat position if possible. For
specific applications, consult an arc welding handbook.
Weld Pass
Sometimes more then one pass is necessary to fill the joint. The root pass is
first, followed by filler passes and the cover pass (See Figures 10 and 12). If
the pieces are thick, it may be necessary to bevel the edges that are joined
at a 60º angle. Remember to remove the slag before each pass.
16
W
Arc Length Too Short
Work Piece
Speed Too Fast
Speed Too Slow
Arc Length Too Long
5º - 45º
Travel Angle
Work Angle
Figure 9 - Weld Angle
Cover
Filler
Root
Figure 10 - Weld Passes