ESAB FABRICATOR 141i
Manual 0-5420 4-15 BASIC WELDING GUIDE
D. Presetting
It is possible in some cases to tell from past experience or
to find by trial and error (or less frequently, to calculate) how
much distortion will take place in a given welded structure.
By correct pre-setting of the components to be welded,
constructional stresses can be made to pull the parts into
correct alignment. A simple example is shown in Figure 4-31.
E. Preheating
Suitable preheating of parts of the structure other than the
area to be welded can be sometimes used to reduce distor-
tion. Figure 4-32 shows a simple application. By removing
the heating source from b and c as soon as welding is
completed, the sections b and c will contract at a similar
rate, thus reducing distortion.
Art # A-07707
Figure 4-31: Principle of Presetting
Art # A-07708
B
PreheatPreheat
Dotted lines show effect if no preheat is used
Weld
C
Figure 4-32: Reduction of Distortion by Preheating
Art # A-07709
Figure 4-33: Examples of Distortion
Art # A-07710_AB
1
Block Sequence.
The spaces between the welds are
filled in when the welds are cool.
2
3
Figure 4-34: Welding Sequence
Art # A-07711_AB
4
3
2
1
Figure 4-35: Step back Sequence
Art # A-07428_AB
Figure 4-36: Chain Intermittent Welding
Art # A-07713_AB
Figure 4-37: Staggered Intermittent Welding
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