The viscosity of the slag in the seamless steel pipe factory is too large
The viscosity of the slag in the seamless steel pipe factory is too large. The gas dissolved in the high-temperature liquid metal during welding will overflow in the form of bubbles during the cooling process. If the viscosity of the slag is too large, the bubbles cannot pass through the slag, and are prevented from being adjacent to the surface of the weld metal to form pores. The seam steel pipe factory can be processed by adjusting the chemical composition of the flux and changing the viscosity of the slag. The reason why carbon monoxide pores produce CO pores is that the FeO and C in the molten pool have the following recovery reactions:
FeO+C==Fe+CO The reaction is more intense when the molten pool is at the crystallization temperature, because the molten pool has begun to condense at this time, and CO gas is not easy to escape, so CO pores are formed in the weld. If the welding wire contains sufficient deoxidizing elements Si and Mn, and the carbon content in the welding wire is limited, the seamless steel pipe factory can suppress the above recovery reaction and effectively avoid the occurrence of CO pores. Therefore, in CO2 arc welding, as long as the welding wire is selected properly, the possibility of CO porosity is very small.