Abstract
Due to the increasing product variety, flexible production facilities are required that can already work productively from
batch-size 1 onwards. This requires flexible and online-capable quality assurance of the processes to be able to detect
defective parts as soon as possible.
One important quality feature in laser welding is the resulting hardness, which usually must be determined post-process.
In this paper, a method for the spatially resolved online determination of the hardness is presented at the example of
laser welding of mild steel. The dependence of the hardness on the cooling rate was utilized for this purpose.
Therefore, the cooling curves were determined spatially resolved during the welding process using a scanning pyrometer
and the heat loss coefficient was determined from these cooling curves as a measure of the cooling rate. The
corresponding local hardness was determined post-process. The results show a correlation between the local hardness
values and the local heat loss coefficients within a set of process parameters, making this a promising approach for the
spatially resolved online determination of the hardness.
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