The reasons for the peeling of the shot blasting machine's spray welding layer are:
Due to the poor quality of the powder, during the spraying process, the powder does not present the "mirror-like" phenomenon. Therefore, it is difficult to differentiate between immature and non-melted powder, often resulting in the powder cap not being fused before the flame moves over, thus failing to form a good spray welding layer.
2. When melting the thick layer of the jacket, the speed was too fast, causing the surface powder to melt while the interior powder had not yet melted. Additionally, either the spray welding layer melted but the base material's skin was too thin, resulting in the inability to form metallurgical bonding.
3. Due to the larger workpieces, the slow temperature rise during remelting causes the powder deposition layer to be in a high-temperature, long-duration heating state, resulting in severe oxidation of the powder. Alternatively, if the workpiece surface has a serious sensitization layer, combined with inadequate surface preparation, these factors prevent the formation of a good bond between the spray-welded layer and the substrate, leading to peeling during processing.
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