I would like to ask everyone, is the welding of this pipe head qualified and can the equipment be used?
Thread Content
The equipment is a shell and tube heat exchanger, similar to the fixed tube sheet type. The pipe head welding issue raised by the quality control department in the picture is currently basically completed. The helium inspection, water pressure test, and air tightness have all passed. Next, pickling and passivation will be carried out. Please tell me whether these problems are serious and whether the equipment can be used. At this stage, it is already difficult to do rework. If these problems are unacceptable, can this equipment have to be scrapped?
The picture isn't very clear, but it doesn't seem like there's much of a problem. Some are welded to tube sheets. It is estimated that the current was too high and the protruding tube heads were melted, and then they were welded by hand. And helium leak detection has been done and there is no problem.
I feel like there's something wrong with it. Strictly speaking, I shouldn't be able to use it.； It depends on where you use it and the situation with your customers. ； For example, if you say it out loud, it is recommended not to use it, otherwise you will claim a large amount of money. It feels like your pipe head has melted and the welds are crisscrossed and covered. Even if the temporary leak detection and pressure test are OK, it is very likely to leak after a long time or due to medium corrosion. .
First, you need to know the system pressure
Sorry, I forgot to mention it. The design pressure is 0.25Mpa.； The material is 316, and both the tube and shell sides are ； The tube side medium is ozone and the shell side medium is water.
What is the pipe head welding problem raised by the quality control department? What is the basis?
It's just that it's not well formed. . . Just touch up and polish or whatever. . Judging from the picture, the tube plate surface was drilled incorrectly, and the tie rod holes were all patched up. . . .
It's obvious that the current is too high. How is the welding evaluation done? Is there any change in the weld composition? Has the corrosion resistance been reduced? Leak testing cannot guarantee these issues.
The welding parameters are too large, but the appearance is acceptable, and I personally don’t think it will affect the use.
The welding parameters are too large, the penetration is too large, and the pipes are burned out. Most of the appearance is acceptable. Personally, I don’t think it will affect the use. It is recommended that some individual pipe heads be repaired and repaired by welding. . . .