Cracks in the teeth of the autoclave
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During the recent magnetic particle inspection of the evaporation kettle, many cracks were found at the roots of the kettle teeth. See the attached picture for details. Please give some guidance from experts as to the causes of the cracks. Thanks!
We have done a stress analysis on the root of the cauldron teeth, and it is obvious that the stress here is very high. If no special treatment is done, fatigue cracks will soon occur.
Should I polish the cracks clean and then make a R5mm chamfer? The autoclave specification requires a R5mm chamfer! I would like to ask, can I repair the welding after polishing it? What kind of welding rod should be used for repair welding? ?
1. Affected by force； 2. The surface finish of processing and manufacturing is not high!
It is recommended that you first determine whether you need to conduct fatigue analysis and design in accordance with JB/T4732 based on the actual working conditions of the equipment. If so, and your equipment is not manufactured according to fatigue analysis design, then you will still have problems even if you repair it, and the cracks at this location pose a very high safety hazard. Once an accident occurs, the door panel will fly out, and the consequences will be disastrous.
Theoretically, grinding the cracks clean and then making a R5mm chamfer can be used temporarily. However, the welding material is different from the original material after all, and the high stress there is not effectively released (the effect of the R5 chamfer will only be known after analysis). Therefore, continued use after repair welding is very risky, and it is recommended not to do this.
Use bao li! This generally does not happen.
Fatigue cracks, stress concentration at changes in the machined cross section, and the autoclave bears fatigue loads during use. Polish it away, we don't recommend repair welding.