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In their most recent blog post, StrainblogTM explain that strain gages can be bonded onto galvanized Steel. As we all know, galvanizing is the process of applying a protective zinc layer onto a metal (i.e. zinc plating), for example Steel so that it is protected from corrosion.
As explained by the StrainblogTM, the zinc layer is thick and soft such that it has to be removed before the strain gage bonding process including surface preparation can take place. A more practical approach is to cover the location (if known) of the strain gage on the steel so that it does not get coated. According to the StrainblogTM, this approach is much easier as the process of removing the plate is difficult. Once the zinc layer is removed, the exposed Steel surface can be prepared and strain gage can be bonded onto the steel using the standard procedure.
Other factors to consider include the reduced accuracy and repeatability in transducers designed using stamping to form the transducer element. These are caused by residual stresses.
How do we solve the problem? Quite simply – StrainblogTM states that photo-chemical machining is one way because it is quick, cost effective and most importantly does the job without any added characteristics such as residual stresses!
For a more detailed explanation on surface preparation and strain gage bonding – refer to the link or get onto the StrainblogTM
For a further discussion contact our Melbourne office by email or phone: +61 3 9874 5777
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