Welding deformation of stainless steel weld neck flange includes two aspects: one is welding deformation of blank before machining; the other is welding deformation of stainless steel weld neck flange and container shell after machining. In addition to the two kinds of deformation described in the literature, the deformation of the former includes the distortion of the section of the stainless steel weld neck flange and the ellipticity of the flange ring; the deformation of the latter includes the angular deformation of the GOST-12821-80 Wn Stainless Steel Weld Neck Flange and the ellipticity of the stainless steel weld neck flange. Both the former and the latter affect the welding and processing of weld neck flange. Therefore, it is very important to prevent welding deformation of weld neck flange.
According to our long-term production experience, to prevent this deformation, we should mainly start from the following aspects. First of all, groove processing: stainless steel weld neck flange seam should be processed into groove shape, blank welding flange tailor-welded, in view of the manufacturing process can make full use of materials, the corresponding standards, clearly defined in the "allowable noon tailor-welded steel plate", and then the tailor-welded seam for 100% non-destructive milk can be. Tailor-welded stainless steel weld neck flange, the general processing procedures are: scratch shallow gas cutting and grooving, grinding groove and assemble weld neck flange one, according to the technical requirements of welding tailor-welded seam, calibrate flange one non-destructive testing, eliminate stress heat treatment one mechanical processing.
In addition, in the welding process of the blank stainless steel weld neck flange, the welding sequence is often incorrect or in order to take appropriate anti-deformation measures, resulting in excessive deformation of the stainless steel weld neck flange, which can be avoided in the usual manufacturing process.
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