I would appreciate it if experts could offer their guidance on the problems encountered during the actual construction of the chemical plant.

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I. Case Background: At the beginning of March 2017, a fertilizer factory carried out its annual major maintenance. One of them is a high-pressure steam pipeline that has been in use for 12 years, with a base material of 12Cr1MoVG and specifications of Φ480×42 mm. The fertilizer plant commissioned a third-party testing company to perform TOFD testing on the welds of that pipeline. The test results showed: \"Microcracks of varying degrees were present in the weld and heat-affected zone.\" ”Subsequently, the construction team and the relevant technical personnel from the fertilizer factory worked together to develop a repair plan, involving local repairs or complete cutting of the defective welds. After the pipeline was repaired, it passed all TOFD tests. The pipeline is now back to normal operation. The construction unit recovers and stores the welded joints of the overall pipe cuts. II. Questions for the experts and scholars: At present, it is planned to conduct physical and chemical property tests on the recovered and preserved weld joints. Before conducting further physical and chemical tests, I would like to hear the opinions and suggestions of experts and scholars regarding such tests. Thank you for this!