Flange welding quality and welding preparation

by:NJPE     2020-07-13
Flange connection at the two pipes, fittings or equipment, fixed on a flange, a first between the two flange, and flange pad, bolt fastening together, complete the connection. Some pipe fittings and equipment have been bringing flange, is also belongs to the flange connection. Flange connection is an important connection mode of pipeline construction. Flange connection is convenient to use, can withstand greater pressure. In industrial piping, within families, pipe diameter is small, and it is low voltage, invisible flange connection. If in a boiler room or production site, the flange connection of pipes and equipment are everywhere. According to the connection flange connection types can be divided into: plate flat welding flange, with flat welding neck flange, butt welding neck flange, socket welding flange, threaded flange, flange cover, with neck butt welding ring flange, ring flat welding flange come loose, ring groove surface flange, flange cover, large diameter plate flange, large diameter high blind flange, butt welding neck flange, eight words ring flange, etc. Flange welding quality as iron plate welding flange, many customers have doubt that whether the quality of the iron plate welding flange is better than the forging welding flange. Actually iron plate welding quality and the quality of the welding flange forging flange is the same, but the iron plate welding flange exactly what place can not be guaranteed, and the material of iron plate welding flange have no security, because the process of general, the density of iron plate welding flange is no problem, but in the process of producing, iron plate welding flange blank rarely tested, so, the production come out later, not tested the material of iron plate welding flange can't guarantee anything. Flange welding preparation of 1. Check the debugging equipment, ensure the equipment running normally. 2. Ready to phi. 4. 0 j402 electrode to 300 ℃ 350 ℃ drying for one hour. Assemble the vertebral bodies and large flange together according to the requirements of drawings, then average the large flange is divided into eight equal parts. Because welding flange thicker, groove is larger, so the piecewise symmetric, multi-layer welding.
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