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.
LSAW pipes, known for their thick walls, high-quality materials, and stable manufacturing processes, have become the top choice for large-scale domestic and international oil and gas pipeline projects. However, in the welding joints of these pipes, particularly in the weld and heat-affected zones, various defects such as undercut, porosity, slag inclusion, lack of fusion, incomplete penetration, burn-through, and welding cracks are common, and these imperfections are often the source of quality issues in straight seam submerged arc welded pipes.
Quality Control Measures for LSAW Pipe:
1. Pre-Welding Quality Control:
Ensure the raw materials meet the required standards. Only materials that pass inspection should enter the construction site, strictly prohibiting the use of substandard steel.
Manage welding materials properly by checking their quality, ensuring proper storage and baking procedures, and verifying that the welding surfaces are clean and free from rust. Ensure electrode coatings are intact and free from mold.
Maintain cleanliness in the welding zone. The weld area must be free from water, oil, rust, dirt, and oxide film, as these can cause external weld defects.
Select an appropriate welding method and conduct test welds before beginning actual welding to ensure optimal procedures.
2. Welding Quality Control:
Verify that the welding procedure specification, including the selection of wire and flux, is correct to avoid quality accidents caused by material mismatches.
Monitor the welding environment closely. If the temperature is below 0°C or the relative humidity exceeds 90%, appropriate measures must be taken before welding can proceed.
Inspect groove dimensions, such as spacing, blunt edges, angles, and offsets, before welding to ensure they meet technical specifications.
During submerged arc welding, ensure the correct parameters for welding current, voltage, and speed are applied both inside and outside the pipe.
Supervise the end plate arc length during the inner and outer welding processes, enhancing the efficiency of arc welding, particularly at the pipe ends, to improve overall weld quality.
Ensure all slag and contaminants such as oil, rust, water, paint, and other impurities are removed from the welding area and the joint grooves before welding begins.
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