WL FITTINGS INC.

Detailed Principle of Necked Flat-Welded Flange Sealing

The two sealing surfaces of the bolt compress against the flange gasket, creating a seal—but this also leads to seal failure. To maintain the seal, immense bolt clamping force must be sustained, which in turn requires the bolts to be made larger. And larger bolts naturally demand correspondingly bigger nuts, meaning that even greater-diameter bolts are needed to provide adequate space for tightening the nuts.

2023/03/30

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How to determine the quality of steel pipes

Folding refers to various zigzag lines that form on the surface of steel pipes; this defect often runs along the entire length of the product. The cause of folding is typically due to substandard manufacturers pursuing high efficiency, resulting in excessive reduction during rolling, which creates "ears." When the material undergoes the next rolling pass, these "ears" transform into folds. Products with such defects are prone to cracking after bending, significantly reducing the steel's strength.

2023/03/30

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Introduction to Professional Fasteners for Butt-Weld Flanges

Mechanical property specimens should be taken from the as-rolled stock after heat treatment, following the rolling direction. The sampling location is determined as follows: If the stock diameter is no more than 40 mm, the sample should be taken from the center; if the stock diameter exceeds 40 mm, the sample should be collected from a point located at one-quarter of the diameter from the center.

2023/03/30

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When casting carbon steel flanges, it's important to understand their internal microstructure.

Casting carbon steel flanges results in a loose and uneven internal structure, making it difficult to ensure their strength and quality. Forging, on the other hand, consumes more materials, requires significant energy, and incurs higher costs—and the junction between the flange and its neck is prone to stress concentration, compromising strength. In contrast, rolling forming effectively avoids these issues.

2023/03/30

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How can the issue of stainless steel flange machining be resolved?

1. After selecting the blanking process and completing it, proceed to the next step. For different stainless steel workpieces, follow the appropriate procedure based on the specific processing requirements.

2023/03/30

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Enhancing the hardness of hot-pressed elbows and stamped elbows

Quenching is a heat treatment process in which a hot-pressed bend is heated above its critical temperature, held at that temperature for a specific period, and then rapidly immersed in a quenching medium, causing an abrupt drop in temperature. This rapid cooling occurs at a rate faster than the critical cooling speed, resulting in the formation of a metastable microstructure dominated by martensite. Quenching enhances the strength and hardness of steel but simultaneously reduces its ductility. Commonly used quenching media include water, oil, alkaline solutions, and salt-based solutions.

2023/03/30

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Global Stainless Steel Production Statistics and Market Development Trend Analysis

Due to the differences in their chemical compositions, their corrosion resistance varies—ordinary stainless steel generally lacks resistance to chemical media, whereas acid-resistant steel typically exhibits excellent rust-free properties. The term "stainless steel" doesn't refer to just one specific type of steel; instead, it encompasses over a hundred industrial-grade stainless steels, each meticulously developed to deliver superior performance in its particular application area. The key to success lies first in clearly understanding the intended use, and only then can the right steel grade be selected. Among these, only about six steel grades are commonly used in architectural and construction applications. All of them contain 17% to 22% chromium, with higher-quality varieties also incorporating nickel. Adding molybdenum can further enhance resistance to atmospheric corrosion.

2019/12/03

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Manufacturing Process of Threaded Pipe Fittings

Threaded pipe fittings are pipe components equipped with threads. We supply pipelines and pipe fittings wholesale—handling both procurement and distribution of chromatography accessories and consumables, as well as chromatography instruments, all available in bulk for wholesale purchase and supply. These fittings are commonly used in applications such as water-gas piping, small-diameter water pipes, compressed air lines, and low-pressure steam systems, where they connect directly to threaded pipe ends to form a complete pipeline system. To ensure a secure seal, appropriate sealing compounds—such as thick white paint or lead oxide-glycerin adhesive—are often applied to the threads. The manufacturing processes for threaded pipe fittings primarily include hot-rolled straight-seam welding, spiral double-sided submerged arc welding, forging, forging and pressing, medium-frequency push-bending, cold forming, and hot extrusion, with the largest pipe diameter that can be processed reaching up to 2020 millimeters. We also offer pipelines and pipe fittings for wholesale distribution.

2019/12/03

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High-Pressure Pipe Fitting Analysis: High-Pressure Elbow Manufacturing Process

The manufacturing process for bent pipes begins by welding a multi-faceted ring shell with a polygonal cross-section—or a closed, multi-faceted sector shell at both ends. Once the inside of the bend is filled with a pressurized medium, internal pressure is applied. Under this pressure, the polygonal cross-section gradually transforms into a circular shape, ultimately forming a fully round ring shell. This technique is ideal for producing large-sized, high-pressure bends where the ratio of the centerline diameter to the inner diameter of stamped bends exceeds 1.5—and it’s the perfect method for crafting sizable, standard-compliant bends. High-pressure bends are widely used in piping systems across industries such as petroleum, natural gas, chemical processing, hydroelectric power, construction, and boiler applications. Importantly, this process eliminates the need for pipe billets as raw material, significantly reducing costs associated with pipe-making equipment and molds, while also enabling the production of bends with virtually any desired length.

2019/12/03

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