According to the news on the website of the national development and Reform Commission on August 3,the national development and Reform Commission and the Ministry of transport recently jointly issued the,"Opinions on accelerating the construction of Tianjin north international shipping hub" points out that by 2035

The welding method of thick-walled steel pipe should be selected according to the material and wall thickness of the thick-walled steel pipe,Because different welding methods have different arc heat and arc force,they also have different characteristics,