Large diameter flange is a kind of flange, widely used and carried out in the machinery industry, get the user’s praise and love. Large diameter flange is widely used, and its application scope is based on different characteristics. It is mostly used in medium conditions compared with moderate conditions, such as low pressure unpurified compressed air and low pressure circulating water. Its advantage is that the price is cheaper
Large diameter flange is a relatively large stiffness and strength, used in high pressure places, cutting production and processing key according to special machine tools or general machine tools; For pipes of too large size, when the current machine tool capacity cannot meet the production and processing standards, other ways can be used for production and processing, such as the way of gas cutting after grinding for large caliber elbows.
For large caliber flange, the quality of the product itself is very important, if there is no special processing equipment and production technology in line with the regulations, it can not guarantee the quality, it can not produce high quality products, large caliber flange is not excluded.
Check the internal quality of the large diameter flange itself, which is not detected by visual quality inspection. This includes checking the internal properties of large diameter flanges and the mechanical properties of flanges. Major components and flanges also require in-depth chemical composition analysis.
Matters needing attention when using large diameter flange: The welding rod should be dry when using. In order to prevent the temperature rise of the flange cover caused by eye erosion, welding process current can not be too large, less than carbon steel electrode up and down 20%, arc can not be too long, fast cooling between layers, to narrow weld passage is appropriate.
The process of large diameter flange is good or bad
In the welding process of non-standard flange fittings, the corrosion resistance and mechanical properties are reduced because of the carbide precipitated by overlapping heating. The hardening of the flange after welding is larger than that of the standard flange in the United States, which is easy to cause cracks. The large diameter flange tube and butt welding flange electrode have good corrosion resistance and oxidation resistance, and are widely used in chemical industry, chemical fertilizer, petroleum and medical machinery manufacturing
Large diameter flanges made with different processes have advantages and disadvantages, but this is not the case. The manufacture of flange of various specifications and the treatment of joint position is the key
If the welding is not good at this position, leakage will occur. As for the large diameter large flange forged, there will be a layer of skin after the waste of the flange comes out. If the bolt hole is just hit on the position of the skin, there will be water leakage when the pressure is exerted.
