A problem during the tank construction process
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The specific issue is as follows: our company is currently constructing a batch of atmospheric pressure gasoline tanks with capacities of 5,000 cubic meters and 10,000 cubic meters each. A fairly obvious problem has emerged during the construction process: the circumferential welds between the panels are all sunken. I hope everyone can analyze the specific situation. In my personal analysis: 1. The strength of the expansion ring may be insufficient, or the fitting of the expansion ring may not be tight enough. 2. The cooling time of the weld is insufficient; by that time the expansion ring has already been lowered, and it contracts once it cools down. 3. It is possible that, after manufacturing, before the weld has cooled, a sudden drop in temperature may cause excessive contraction. I really hope fellow sailors can help analyze this. Thank you all
There is stress concentration; please check the construction and acceptance specifications for vertical cylindrical welded oil tanks to see whether the work was carried out in accordance with those specifications!
Pay attention and see what everyone has to say.
This is related to the coordination between the riveter and the welder. The riveter joins the two steel plates together, and after they are properly aligned, the welder carries out electric welding first. Once the stress is even, a full weld is applied. During welding, the welder applies force evenly in one direction; if any deformation occurs, it should be corrected promptly using a sledgehammer to prevent distortion in the subsequent layers of metal
Reply to 4# Little Monarch: Thank you. I have also analyzed the points you mentioned; indeed, the suitability of the riveting workers is a very important issue, and proper welding techniques are another important factor as well. Personally, I think that after welding, the expansion ring is inserted too quickly, and possibly too suddenly, which leads to stress concentration at the welded area.