Installing The Strain Gages; Preparing The Surface - HBM LS31 Notice D'utilisation

Installing the strain gages

2 Installing the strain gages
1)
HBM recommends the mobile impulse welding machine c30 from Walter Heller GmbH.
Further information can be found under
4
This strain gage is installed by spot welding
The welding spots transfer strain to the strain gage. High
requirements are placed on the quality of the welding
spots, since much higher shear stresses will occur than
with normal strain gages, because the required force for
the elongations is much higher than with a strain gage
without metal carrier.
The metal carrier must not be cut. The smallest bending
radius for the LS31 strain gage is 75 mm.
2.1

Preparing the surface

1. Clean the measuring point from contamination.
2. Smooth the surface by filing, grinding, etc.
3. Use a solvent like HBM's RMS1 for roughly degreas­
ing the measuring point.
4. Weld on the strain gage (see pictures): alternate the
welding spots from the inside out, ending with the
welding spots across the grid.
www.heller­schweisstechnik.de
A1675-3.1 HBM: public
1)
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LS31