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Welding Distortion Control and Prevention of Diaphragm Filter Press Frame
- 2021-11-26-

Diaphragm filter press has the advantages of high pressing pressure, good corrosion resistance, convenient maintenance, safety and reliability, etc. It is the first choice for customers in metallurgy, gas, papermaking, coking, pharmaceutical, food, brewing, fine chemical and other industries. Among all manufacturing components, the function of the filter press frame is to support and constrain the filter organization, so that the filter organization can meet the functional requirements of filtering, pressing, washing the filter cake, etc. The frame is the basic part of the filter press, and the 2 heads are The head equipment, the tail equipment and the moving plate are connected by the beams on the two sides, and the beams are also used to support the filter plate equipment and the moving plate equipment.

The quality of the welded seam plays a decisive role in the whole welded structure. For welded structures and components, the residual stress will not only reduce the stiffness and stability of the structure, but also seriously affect the structure under the combined action of temperature and medium. Fatigue strength, resistance to brittle fracture, resistance to stress corrosion cracking and high temperature creep cracking. Because of the existence of residual welding stress, the stress concentration sensitivity of the structure at the welded joint is increased, and the sensitivity of hydrogen embrittlement and cracking is increased, resulting in structural Decreased security and longevity of service.

During the manufacturing process of the frame, when the low alloy plate is CNC or semi-automatic blanking, segmented cutting and slow cooling are selected to ensure that the welding deformation of the material is controlled within a small range. During the assembly welding, the groove can be processed and manufactured. Tooling fixtures, using methods such as anti-deformation and appropriate welding sequence, and comprehensively controlling process parameters such as pre-welding preheating, interpass temperature, welding heat input, post-welding, and post-weld heat treatment to reduce welding deformation of components. Deformation can choose mechanical correction method or heating correction method.