30
SECTION 3 OPERATION
Figure 3.30 - Weave Pattern
Since single weld beads are of limited value, weaving weld beads must be practiced on butt welds in the vertical and
horizontal positions.
Figure 3.31 provides information suitable for a single pass vertical butt weld or the first pass of a multiple layer deposit. Two
methods of depositing the subsequent layers are given in Figure3.32.
Figure 3.31 - Single Pass Vertical Butt
Weld
Figure3-32 Multilayer Deposit. Vertical Weld
For horizontal welds the details are shown in Figure 3.33 and 3.34. Note that a strip of metal is shown at the foot of the weld.
This is known as the backing strip. Its use permits securing a sound root pass without great difficulty. In use, the beveled
plate edges should be centered on the backing strip and the strip tack welded to the plates on the reverse side.
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