Seamless steel pipe welding presents the reason of porosity

Seamless steel pipe welding process dissolved in the high temperature liquid metal gas in the cooling process will be in the form of bubbles overflow. If the slag viscosity of the seamless steel pipe is too large, the bubbles can not pass through the slag and are blocked near the surface of the weld metal to form pores. Steel pipes can be processed by adjusting the chemical composition of the flux and changing the viscosity of the slag.

Hole produces CO holes, seamless steel pipe is mainly FeO, C in the molten pool has the following recovery response: FeO + C == Fe + CO when the molten pool is at the crystallization temperature, the response is more intense. At this point, the molten pool begins to condense, CO gas is not easy to escape, so the formation of CO pores in the weld.

If the welding wire contains satisfying deoxidizing elements Si and Mn, and the carbon content in the wire is limited, the seamless steel pipe can make the above recovery response and effectively avoid the appearance of CO porosity. Thus, in CO2 arc welding, only proper selection of the welding wire is required and the possibility of CO porosity in seamless steel tubes is minimal.

Although seamless steel pipe is a versatile material steel, this does not mean that it can be placed with most materials. Here, as an example, we briefly explain to you the consequences of placing carbon steel and seamless steel pipe together, Seamless Steel Pipe Factory, Seamless Steel Pipe Manufacturer.

If they are stacked together with carbon steel products, such as carbon steel pipe, some undesirable chemical reactions can occur. Because carbon steel pipes are different from seamless stainless steel pipes, they will rust when put together. Also, if different steels are placed together and in contact with each other, an electrical potential difference will occur and then galvanic coupling corrosion will occur, especially if they are wet or waterlogged. Galvanic coupling corrosion will primarily cause an oxidative recovery reaction of the steel. In order to avoid this reaction of seamless pipe, do not put different materials of steel together.