Stainless steel composite plate welding seam defect analyzing and repairing method

Abstract

The invention belongs to the technical field of defect, flaw or stain testing, and discloses a stainless steel composite plate welding seam defect analyzing and repairing method. The method includes the steps that the detection results plus technical analysis are adopted to replace complete relying on the detection results for judging, whether the defect position is located at a base layer, a composite layer or a transition layer can be accurately determined, a slop opening is formed reasonably according to the composite plate welding requirements during repairing, during welding of the transition layer, an arc groove slope opening with the depth of 1.5-2 mm and the width of 3-5 mm is formed from the composite layer to the base layer downwards, the arc groove slope opening design has manyadvantages, the transition layer repair defects are avoided advantageously, the repair quality of the transition layer is ensured, and a proper welding process is adopted to ensure welding defect reducing and repair quality. By means of the stainless steel composite plate welding seam defect analyzing and repairing method, the defect position can be more accurately and advantageously, the multiplerepair is avoided, the generation of welding cracks is avoided, the transition layer can be made to completely cover the base layer advantageously, and the height and welding quality of the transition layer welding seam metal are ensured.

Description

Technical field [0001] The invention belongs to the technical field of testing the existence of flaws, defects or stains, and in particular relates to a method for analyzing and repairing weld defects of stainless steel composite plates. Background technique [0002] At present, the existing technology commonly used in the industry is as follows: At present, the one-time pass rate of welding defects of stainless steel clad plates is often not very high, and sometimes there are even multiple repairs, mainly because the defect location in the welded joint is difficult to locate, the depth of the defect is difficult to judge, and it is easy to miss or insufficient repairs. The reason is that the repair of the same material often uses ultrasonic detector or radiographic inspection to determine the location of the defect. However, for stainless steel clad plates, X-ray inspection can only approximately determine whether the defect is located in the base layer or the composite layer or...

AI Technical Summary

Problems solved by technology

[0005] (1) In the past, only the flaw detection results were used to determine the defects of the stainless steel composite layer, and it was often impossible to accurately determine the exact location of the defects. It was only possible to roughly determine whether there were defects on the base layer side, and it was impossible to judge the defects of the transition layer and the cladding layer

[0006] (2) The position and depth of the defect cannot be accurately judged based on the flaw detection results, and it is prone to missed judgments or insufficient repairs, often resulting in multiple repairs

Multiple repairs not only seriously affect the performance of the composite steel plate, but also after multiple thermal cycles, due to the large difference in expansion coefficient between the base layer and the clad layer at the transition layer, a large internal stress will be generated, resulting in a micro Cracks propagate into cracks under repair stress

[0007] (3) The following problems are prone to occur in the repair of the conventional groove form of the stainless steel composite plate: it is not conducive to the side cleaning of the base layer, resulting in easy damage to the cladding layer when welding the transition layer; it is difficult to control the fusion ratio, resulting in the dilution of the base layer to the weld metal; It is difficult to ensure the height of the base weld; the transition layer is difficult to completely cover the base, etc.

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