ps: If you want to hear more of your voices and receive more of your suggestions, search for the WeChat public account "qdread" now and pay attention to it to give more support! In Wu Qiang's eyes, the young leader who seemed to be just going through the motions seemed to have never left the conference room, and quietly put forward his great plan full of wisdom at the right time.

"This ...... Was it written by Director Zhang?" Wu Qiang was both surprised and evil, he would rather believe that it was written by the little-known Wen Tianming.

"Well, he left it before he left, tell me not to disturb your discussion, and take it out when you rest. Wen Tianming is a person who is used to seeing magic, and he has a hunch that what Zhang Yifu left behind will have some effect, but he didn't expect Wu Qiang to be so shocked, "Director Wu, is this practical?"

"Wait, I'll ask first. Before Wu Qiang answered this question, he had to find out who Zhang Yifu was, "What is Director Zhang's major?"

"Power system. ”

"Are you sure he hasn't touched industrial design?"

"As far as I know, no. ”

"Do you have any experience in that job?"

"I should have been in contact with some of the power plant compliance projects. Wen Tianming replied, "But Director Zhang's knowledge ...... We can't figure it out, we have already shown it in the national competition. ”

"Is there an industrial design project in the national competition?"

"How is that possible, it was a race for the power system. Chang Siping on the other side finally couldn't hold it back, "Director Wu, show me that piece of paper too......

"Please take a look...... Wu Qiang hurriedly pushed the paper back again, "God...... Obviously a person with no background in industrial design, but the things that come up are professional...... I don't know how to compare it to Professor Chang. All in all, it's definitely enough to guide me. ”

Everyone in the audience thought it was funny and didn't believe it.

Wu Qiang has been arguing with Chang Siping for a long time, obviously no one is convinced. But as soon as I saw what Zhang Yifu wrote, I was immediately convinced. Could it be that the meaning inside and outside the words is that Zhang Yifu is higher than Chang Siping's level?

They didn't think that Wu Qiang's words were from the bottom of their hearts, but they were just a little willful exaggeration.

Although Chang Siping could not understand Wu Qiang's emotion, he believed that Zhang Yifu was unfathomable, and he began to read this piece of paper when he was suspicious.

At the beginning, the first paper mainly talked about some key points and difficulties in the production and manufacturing of economizers, as well as recommended welding parameters and so on. e.g. welding current, nozzle diameter, argon flow. All of them put forward very accurate recommended parameters, which are slightly different from the parameters calculated by Chang Siping's own simulation, but they are all within the acceptable range of theory. In addition, there are also explanations in the welding details, such as when the arc swings laterally, which kind of operation should be done in one go without stopping, etc., the delicate process of these small details is far beyond what Chang Siping described, and the professor is only responsible for theoretical results, not empirical skills. That's the experience of a welding mechanic.

Mother's Zhang Yifu has ever worked as a welder?

Chang Si also showed a lot of surprise on the plane, and hurriedly turned to the second side.

As soon as he saw the key words of a few key points, Chang Siping shouted "Ah!"

Isn't that exactly what I've been arguing about for hours?

Symmetrical welding in horizontal position and symmetrical welding at 45° oblique!

Two scenarios. The process is similar, the only difference is the welding angle, and it is this small angle that the two sides are fighting for.

In the eyes of a layman like Wen Tianming, this is incomprehensible, the pipe is round anyway, not welded horizontally and vertically?

Visually, this welding process is not complicated and can be likened to inserting wings into a tube. The fins with excellent heat transfer performance are the fins, and the whole process is to make the rectangular strip fins. It is welded on the top of the pipe to achieve a miraculous heat transfer effect.

So the understanding in Wen Tianming's mind. It is to put a pipe on the ground, the nozzle is facing yourself, and then the left and right are symmetrical, put two rectangular flat pieces, and stick the flat side to the pipe wall, this process is called welding, to be precise, horizontal welding.

Therefore, he can't understand, just paste it like this, it's not over, how comfortable and simple it is to stick a horizontal bar, why should you be full of food and support, put two rectangular flat pieces at an oblique position of 45 degrees and then paste it, why bother to stick it obliquely?

It's like a man and a woman in that, and it doesn't feel exciting to do it on the bed, so you have to let the woman's upper body lean to the ground and get an angle to come out, which is incomprehensible and unreasonable.

In fact, Wen Tianming's understanding is mostly correct, but he ignores a small place.

That is, the tube is round.

Stick a flat piece horizontally and vertically onto a round tube, and there must be a gap at the mouth, no matter how small the gap is, there will definitely be. In fact, mathematically, the place where the flat sheet and the round tube can really be bonded is only an infinitely thin straight line, and the rest of the parts are "gaps", and such a paste is obviously impossible to be reliable.

Fortunately, we invented the magic of "electric welding", which can deform the metal under the burning of the high-temperature arc in a short time, and then the hard metal becomes plasticine, we can pinch two pieces of plasticine together, and then let it cool, so that it becomes one.

Therefore, during the welding process of the fins and the round pipe, the seams connecting the two things become plasticine for a short time, producing the deformation we need, thus making up for those gaps, and welding them together with the pipe seamlessly, thus forming a solid one.

Be warned, this is not the end!

Steel, after all, is not plasticine, but it becomes plasticine for a short time at high temperatures.

As the steel cools, the properties of plasticine disappear, and the rigidity and thermal expansion and contraction come into play, so in the process of changing from plasticine back to steel, something called "weld shrinkage" is formed. Because the weld becomes colder, the steel begins to shrink, which in turn affects the fins and the pipe, and when this force reaches a certain level, the fins with lower rigidity will be deformed and forcibly stretched and twisted by this force.

This deformation is called "wave deformation", or "distortion deformation".

This is the basic physical characteristic of all things, so this deformation is impossible to avoid, so the industry has produced a standard, which puts forward requirements for the deformation of the deformation, indicating that the deformation within a certain degree of dù is acceptable, and the quality is passable, and if it exceeds a certain degree, it does not meet our standards.

The difficulties in the structural design of this fin economizer have long been overcome by Zhang Yifu, so Chang Siping's main job is to make the product possible, and meet the national standards, and can be put into production.

Therefore, the scheme he proposed was to weld at an angle of 45°. (Mine will have more fresh content on the official WeChat platform, and there will be a 100% lottery gift for everyone!Open WeChat now, click on the "+" sign in the upper right corner "Add Friends", search for the official account "qdread" and follow, hurry up!) (To be continued)