During the processing of a toothed sleeve in our company’s manufacturing workshop, an issue was identified where the internal spline and the central hole were not concentric due to a machining error. This resulted in a partial absence of the spline on one side, with the missing section measuring up to approximately 2mm. Since all components had already moved into the final assembly stage and the delivery deadline was approaching, it was decided to proceed with repairs while ensuring that the product's performance would not be compromised.
As the toothed sleeve was already fully machined, a detailed inspection was conducted using the workshop’s machine tools. Each component was measured, and non-conforming areas were marked with a marker. The depth of the missing material was also noted. After the inspection, it was confirmed that, aside from the lack of machining on one side of the internal spline groove (as shown in the drawing), all other dimensions fell within the acceptable tolerance range. The affected area measured 60mm by 400mm, with a machining loss ranging between 1 to 2mm.
**Weldability Analysis**
The material used for the toothed sleeve is 40CrNiMoA, a high-strength alloy steel commonly used in applications requiring excellent mechanical properties and wear resistance. Its chemical composition is outlined in Table 1 below:
| Element | Content (%) |
|---------|-------------|
| Carbon (C) | 0.35–0.42 |
| Chromium (Cr) | 0.80–1.10 |
| Nickel (Ni) | 1.20–1.60 |
| Molybdenum (Mo) | 0.15–0.25 |
| Manganese (Mn) | 0.30–0.60 |
| Silicon (Si) | 0.15–0.35 |
The internal spline structure is illustrated in the image below for reference:
Internal spline structure
For more detailed information, please refer to the attached document or consult the 18th issue of *Metalworking (Hot Processing)*.
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