Flange Wuxi

Flange WuxiIntroduction:

The common raw materials for producing flange blanks are flat welding flanges and butt welding flanges for large-diameter flanges. Threaded flanges do not have large diameters. In actual production and sales, the proportion of flat welding products is still higher. The structure and scope of use of flat welding large-diameter flanges and butt welding large-diameter flanges are different, and the characteristics and advantages they can display will also be different. Therefore, when using them, it is necessary to use them according to different scopes to ensure that the flanges play an important role. Large diameter flat welding flanges have poor rigidity and are suitable for situations with pressure p ≤ 4MPa; Welding flange, also known as high neck flange, has relatively high rigidity:

The part that connects the flange blank and the pipe to each other, connected to the pipe end. There are holes on the flange, and bolts tightly connect the two flanges. Seal the flanges with gaskets. Flanges are a type of disc-shaped component, most commonly used in pipeline engineering, and are typically paired together. In pipeline engineering, flanges are mainly used for connecting pipelines. At the end where two pipelines need to be connected, install a flange on each end. For low-pressure pipelines, threaded flanges can be used, and for pressures above 4 kilograms, welded flanges can be used. Add a sealing gasket between the two flanges and tighten them with bolts.

Liaocheng Tonghuang Machinery Parts Co., Ltd. is a large-scale material circulation enterprise that specializes in the production and operation of flange blanks, flange plate blanks, stamping parts processing plants, flange plate manufacturers, flange blanks, metal gaskets, flange blind plates, flange blank manufacturers, stamping special-shaped parts, special-shaped flange blanks, flange plate blanks, stamping discs, square flanges, gaskets, stamping parts, extruded parts, flange plate blank drawing production, printing plate making plugs, plate making roller plugs, and gravure printing plate making plugs Our company has 3 400T punching machines, 6 160T punching machines, 10 100T punching machines, 20 lathes, and 8 drilling machines. We have strong technical strength and can customize various flange blanks according to customer needs.

Flange WuxiThe product is widely used in petroleum, chemical, light industry, aviation, electricity, heating, shipbuilding, urban construction, oil and gas transportation, etc.

Since its establishment, our factory has been committed to the development and production of practical and cost-effective flange blanks, forged flange blanks, stamped flange blanks, flange plate blanks, flange plate blanks, and other products. We are a professional manufacturer of flange blanks and gear blanks, with a group of professional technical personnel, strict management systems, advanced production processes, and comprehensive quality assurance systems, providing sufficient guarantee for product quality. Stable product quality wins over consumers, and honest and trustworthy business style strengthens customers' confidence in long-term cooperation.

Liaocheng Tonghuang Machinery Parts Co., Ltd. welcomes new and old customers to negotiate and place orders.

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Service tenet: Strong strength, high-quality products, low prices, and excellent service.

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Flanges are commonly used pipeline components, and welding is often used to connect flanges to pipelines. But if the welding is not done properly, it can cause cracks between the flange and the stainless steel pipe. So why did the flange crack during welding? What if we avoid this situation? Let's take a look together, hoping that these contents can help everyone better understand the things to pay attention to when welding flanges, a type of pipe fitting.

Before knowing the cause of welding cracks in flanges, the first thing to know is the type of crack, whether it is a hot crack or a cold crack. Depending on the type of crack, the cause also varies. Flange welding cracks occur during the welding of flanges and stainless steel pipes. Welding is a manufacturing process and technology that involves heating, high temperature, or high pressure connections between metals and other thermoplastic materials such as plastics. Therefore, flange welding cracks resemble hot cracks.

Here, we mainly analyze the causes of flange hot cracks, as welding generally leads to hot cracks.

Hot cracks are cracks generated during the high-temperature stage of the welding cooling process, mainly existing in the welded metal. It also exists in small quantities near the crack, divided into crystallization (solidification) cracks, liquefaction cracks, and polygonal cracks. Among them, crystal cracks are common cracks, mainly occurring in the welding of carbon steel with high impurity elements. So, there are many reasons for flange welding cracks. It can be caused by the flange or stainless steel pipe itself. It can also be caused by welding tensile stress and the degree of overheating of the welding joint. Specifically, the situation is as follows:

When the carbon content exceeds 0.04%, carbides will be produced, and the more carbides there are, the lower the corrosion resistance and brittleness of the steel. Welding the flange with stainless steel pipes at this time may cause cracks.

2. The influence of heat treatment process: Austenitic stainless steel requires solution treatment to improve corrosion resistance. The temperature of solution treatment is related to the carbon content in the steel. High carbon content, requires high heating temperature, fast cooling speed, and uses cold water. The slow cooling rate of solution treatment not only reduces the corrosion resistance of steel. It can also damage the continuity of welding and cause cracks.

3. Welding stress.

Welding consists of two parts: heating and cooling. When the heat source moves along the welded object, the temperature at a certain point on the welded object increases from low to high over time, and when it reaches the limit value, it increases from high to low, forming a welding thermal cycle. During welding, due to the concentrated intensity of the heat source, the heating speed is much faster than the heat treatment conditions, and the locally heated area continues to move. Therefore, the welding area near the flange is subjected to complex welding stresses during welding, resulting in cracks.

The above is some knowledge about the occurrence of cracks in flange welding. We hope that everyone can avoid these situations during construction, so as to improve the quality of the project.