Number of product welding test pieces
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There is an S30408 pressure vessel whose working medium is ethylene oxide (highly hazardous). In accordance with the Regulations on Fixed Pressure Vessels and GB150 requirements, welding test pieces for Class A longitudinal weld joints must be prepared. The cylinder has a thickness of δ12, with three welds labeled A1, A2, and A3. The cylinder material is from the same batch and with the same furnace number as specified in the standards. The manhole is made from δ8 steel plate rolled into shape, and it has a weld labeled A4. The welding processes for A1 and A3 are submerged arc automatic welding, while the welds for A2 and A4 are shorter; the welding process for these is shielded metal arc welding. How many welding test plates are required for this product? ① One, representing the extended portion of weld A1 (or A3), submerged arc automatic welding ； ② Two: one is the extended portion of A1 (or A3), submerged arc automatic welding ； One is the extended portion of A2; there are three cases of shielded metal arc welding③. Another is the extended portion of A1 (or A3), in the case of submerged arc automatic welding ； One is the extended portion of A2, shielded metal arc welding ； One is the extended part of A4, shielded metal arc welding
This post was last edited by Linglingqi on 2016-6-9 at 16:24. Two are sufficient (as for the number of product welding specimens required per device: in my opinion, if the welding process evaluation is the same – i.e., the welding method, thickness range, and other important factors are identical – then only one set of welding specimens needs to be prepared)
If A1 and A3 use the same submerged arc welding assessment, and A2 and A4 welds use the same manual welding assessment, I believe it would be sufficient to prepare two specimens.
I agree with what was said on the 3rd floor; actually, what was mentioned on the 2nd and 3rd floors represents the same viewpoint!
The new fixed-content regulations further remove the provision stating that \"the number of welding specimens to be prepared from each pressure vessel product shall be determined by the manufacturing unit, based on the material, thickness, structure, and welding process of the pressure vessel, in accordance with the design drawings and the standards referenced in these regulations.\" ”This sentence. Only \"(2) The raw materials of the test specimen must be of qualified quality, and must meet the same standards, have the same grade, the same thickness, and be in the same heat treatment condition as those used for pressure vessels\" ； ”This sentence. . It’s easy for people to ask you for an explanation regarding the \"same thickness\". . So: the safe approach is to make 3 pieces. . The direct way is to ask the inspection team. How much to do.
In fact, from the perspective of controllable quality and efficiency, the same welding process should be used for A1 to A3, and the longitudinal seam of the manway sections could also adopt the same process as that used for A1. This way, just one set of test pieces is sufficient. If manual welding is required for the manhole section, I believe there is no need to prepare product welding specimens.
1. The number of welding test plates shall be determined by the manufacturer if not specified in the drawings. 2. For ordinary manholes, the end caps are not used as product welding test plates. It is mainly done by longitudinal seams on the cylinder. Save costs.