Table of Contents
Advertisement
Next, add another row of welds as close to gauge ends as possible, between the
welds of the previous row, as shown in below. Once that is complete weld the
second mounting tab per the instructions in Section 4.2.5.
FIGURE 13: Spot Welding Sequence, Inner Rows
4.2.5 WELDING THE SECOND END PIECE
When all the weld dots on one mounting flange have been welded, proceed to
weld the other end as follows:
Place the alignment tool over the two ends of the gauge as shown below. This
will ensure that the two ends of the gauge are welded in a straight line.
FIGURE 14: Using the Alignment Tool
With the alignment tool held in place, make a preliminary weld in the center of
the second tab, outside of the back row, and close to the outer edge. When this
spot has been welded, connect the gauge to the readout box and check the
reading.
■
If the reading is within the acceptable range, proceed to spot weld two
more welds along the back line. Remove the alignment tool and weld the
rest of the tab following the same pattern and sequence used for the first
tab.
■
If the reading is not acceptable, the preliminary weld can be undone by
using a sharp razor blade to pry under the tab at a point close to the weld.
Welds should have a slight depression and be uniform in appearance. Keep the
hand probe weld-tip clean and free of burrs. Periodically sand it gently with 400-
grit sandpaper. Take care to keep the weld-tip a well-rounded point. Proper
dressing will keep the tip from sticking to the mounting tab during welding.
Note: When the gauge is used on curved surfaces, make a third row of welds
on the periphery of the mounting tab (between the stenciled row and the outside
edge).
4.2.6 INSTALLING COLLAR SHIMS
Strain gauge performance is enhanced by the addition of the supplied collar
shims. These shims are preformed in the shape of an L, and are welded over the
top of the gauge ends as follows:
MODEL 4100/4150 SERIES VIBRATING WIRE STRAIN GAUGES | GAUGE INSTALLATION | 11
13:
14:
Advertisement
Table of Contents
