The five test process of expansion.
Expansion pipe product quality inspection process is one of the important measures to prevent waste inspection process are:
1. All rough machining after finishing before
2. To outside the shop before and after processing of expansion pipe products, especially before and after heat treatment
3. The final processing after the expansion pipe products
4. The blank, important or complicated structure before four-column hydraulic press machinery processing expansion pipe products
5. Important and work before and after the expansion of product process