The anti-corrosion protection of pipelines is a key link to ensure the long-term safe operation of the entire system. At the joints of pipelines, due to welding or connection operations, the original anti-corrosion coating may be damaged. Therefore, re-coating or re-coating must be carried out. This process is called field joint coating. The function of field joint coating is to provide continuous and reliable anti-corrosion protection for the weld seam and the exposed steel...