Abstract
The paper deals with analysing the causes of damage to the injection mould insert block to produce plastic parts. Mould insert block material has been declared as alloy tool steel for hot working 1.2344 (X40CrMoV5-1). Part of the analysis is also evaluating an attempt to repair a damaged block using welding methods temporarily. However, there was an intense cracking of the welded joint already during the welding process. Therefore, a non-destructive capillary test was used to analyse surface defects. Complex material analysis of the mould insert block was performed using light and electron microscopy methods, the chemical composition was determined based on optical emission spectrometry.
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