We Super Steel Manufacturing Co.,Ltd(SMC) are amongst the top manufacturers and suppliers for the seamless steel pipe, welded steel pipe, OCTG products and fittings from China. We have been manufacturing and supplying these products to the industry since 1993, and received repeat orders and appreciation from our valued customers.
High quality piping products from approved manufacturers.
In order to continuously improve our offerings to our clients, we have consistently improved and upgraded our manufacturing facility and can hence offer material with stringent requirements.
Over the years, Super Steel Manufacturing Co.,Ltd(SMC) has developed an enviable reputation for project management for the Oil & Gas, Construction, Power Energy, Marine & Offshore, Water Treatment, Exploration & Drilling Services, Pipeline & Petrochemical and other heavy industries.
The many years of experience that we have means that there is always someone who has the ability to carry a project forward.
Always up to date. In this column you can find the steel pipe related articles, including industry trends, product standards and materials, and some technical guidelines.
The cross-sectional shape of a butt weld joint in longitudinal straight seam welded(LSAW) pipes depends on the thickness of the pipe body. Before welding, the groove is prepared, and both sides of the weld are shaped accordingly. For thicker steel plates, grooves are designed to allow better penetration at the edges, facilitating easier insertion of welding rods or wires. The groove types can be classified as one-sided welding or both-sided welding, based on the specific requirements.
When selecting the groove type, factors such as ensuring adequate penetration, minimizing filler metal usage, reducing welding deformation, and lowering the beveling cost should be taken into account.
The junction formed by welding the longitudinal seam is referred to as the weld. The welding process affects both sides of the joint, creating a heat-affected zone (HAZ), where the structure and properties may differ from the base material. This area is subjected to varying effects due to the different welding currents and materials used. Overheating, embrittlement, hardening, or softening may occur in the weld and heat-affected zone, leading to a degradation of the weld's properties and weldability. To improve the quality of the weld, adjustments to the welding conditions, such as preheating the interface before welding and post-weld heat treatment, are necessary.
Longitudinal welding involves the bonding of two or more materials, either homogeneous or heterogeneous, through a combination of diffusion and atomic or molecular bonding. This process can be achieved by heat, pressure, or a combination of both.
Additionally, the rapid heating and cooling of the weld foot during the welding process leads to expansion and contraction constraints. As a result, welding stresses and deformations are generated in the weldment. To ensure the final product's quality, it is essential to eliminate welding stresses and correct any distortions post-welding.
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