With the development of oil and natural gas long-distance pipeline towards high steel and large diameter

automatic welding has become the main welding operation method in long-distance pipeline construction.However

the selection

control and optimization of automatic welding process parameters are essential

especially for different steel grades

pipe diameters

welding material manufacturers and automatic welding equipment manufacturers. This paper relies on the Sino-Russian East Line Natural Gas Pipeline Project to carry out a large number of automatic welding process welding tests. The causes of the crater cracks in the automatic welding with solid wire of the long distance pipeline are analyzed. The process parameters were optimized for Prevention of crater crack occurred during welding.Through the parameters of the automatic welding power source TPS3200 Setting and testing

the crater crack for the site has been effectively solved

which provides a quality assurance for site welding.