Reasons for the Pores in Welding Seamless Steel Pipe
The slag viscosity of the seamless steel pipe plant is too high. 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 blocked near the surface of the weld metal to form pores. The seamless steel pipe manufacture can solve this problem by adjust the chemical composition of the flux and change the viscosity of the slag.
The reason why carbon monoxide turns into pores is that the FeO and C in the molten pool of the seamless steel pipe plant have the following recovery response:
FeO+C==Fe+CO This reaction is more violent when the molten pool is at the crystallization temperature, because at this time the molten pool has begun to condense 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 restricted, the seamless steel pipe factory can suppress the above-mentioned recovery response and effectively avoid the occurrence of CO pores. Therefore, in CO2 arc welding, only the proper selection of welding wire is required, and the possibility of CO porosity in the seamless steel pipe factory is very small.
Changsha Xiangjia Metal Materical Co., Ltd. the Steel Pipe Division of ADTO GROUP, is one of the leading manufacturers of steel products in China. We specializes in manufacturing all kinds of steel pipe in various grades and sizes. Years of production experience and manufacturing facilities who have a capacity of 200,000 tons per annual will ensure the good quality and competitive duration of our products.