Welding and bonding are the two primary techniques used to install strain gauges. The first method involves attaching a weldable strain gauge to a metallic surface and joining the two using a resistance spot welder. Conversely, bonding refers to the installation of strain gauges with an industrial adhesive. At HBM, we are frequently asked when it is appropriate to bond a strain gauge, and when welding is more suitable. We have put together a short primer discussing the advantages of each technique so you can see for yourself:
Advantages of Welding | Advantages of Bonding |
Application at low temperatures where most adhesives cannot be applied due to to environmental curing conditions (e.g. oil pipelines).
| Easy and quick installation with cold curing bonding materials. |
Low sensitivity to humidity during installation of strain gauge (for rough environments)*. | Flexible installation on tricky areas (on radial surfaces or on small-dimensioned areas). |
For long-term application in rugged environments. | A lot of different strain gauge variants are available. |
| No welding device required (cheaper for standard applications). |
* Protection of strain gauge after installation is recommended, since welding spots may be affected by corrosion.