A nation's industrial development begins with junior engineers.

Chapter 925 Interacting based on morality and exchanging knowledge

A loud voice, tinged with a hint of mockery, came from behind the crowd. The crowd parted, and there walked Master Shi Lu, dressed in work clothes stained with oil, swaggering over.

Upon seeing his "enemy" arrive, the silly boy couldn't help but shrink back.

The main problem is that Teacher Peng's background is too strong; even two clueless kids tied together don't have half the toughness of him.

If you think that only those with a shaggy face can be seen in photos, then others can just walk right in and ask for a cup of tea.

But Teacher Peng is indeed quite interesting. His early experiences in the underworld have given him a more human touch, unlike some big shots who can leave you terrified and speechless for a long time with just a glare.

Teacher Shi Lu walked straight to Jiang Xia's side. Instead of being a serious elder, he reached out his rough fingers and jokingly tugged at the stubborn tuft of hair on Jiang Xia's forehead. "What's wrong, Xia Xia? You've read a few foreign books and you dare to give your Uncle Shi Lu pointers?"

Jiang Xia was jolted by his tug and helplessly slapped his hand away: "Uncle Shi Lu, it's not about giving advice, it's just that this steel really can't be welded like that."

"Oh? Then tell me, how do you weld it?" Teacher Shi Lu crossed his arms, adopting a "let's see what kind of nonsense you can come up with" attitude, intending to test this son of his old friend.

“You are using high current for rapid welding, which is efficient, but the heat input is too large, the heat-affected zone exceeds 10mm, and with no preheating, the cooling rate is too fast. Once the martensite structure is formed, it will definitely crack.”

"Nonsense!" Teacher Shi Lu glared. "High-current welding ensures sufficient penetration for a strong weld! Low-current welding takes forever, resulting in a mountain of weld beads, and it's prone to slag inclusions and incomplete penetration. When you dive down, the water pressure will cause problems!"

"Look at this carbon equivalent analysis report." Jiang Xia took a piece of paper out of his pocket. "The carbon equivalent of this steel exceeds 0.5%, making it extremely sensitive to cold cracking. A large current will only exacerbate stress concentration."

He picked up the welding torch and gestured, "You have to use a low current for multi-layer, multi-pass welding. After each pass, you have to clean the slag, maintain the interpass temperature at 200°C, preheat to 300°C before welding, and immediately postheat after welding to remove hydrogen. This is how you reduce martensitic structure and lower internal stress."

"Hmm? A metallographic analysis report?"

Teacher Shi Lu held up the paper and exclaimed, "Wow!" He asked, "Where did you get this, kid?"

"Analysis Laboratory of the First Ministry of Machine Building!"

"How could it be so fast?"

As soon as Teacher Shi Lu said those words, he realized he had asked too many questions.

What else could it be? It must be because of "Big Yellow" and the special information network behind it.

As this brat's family member, the Ministry of Machine Building, upon receiving the letter, could easily expedite a materials test.

Hey, you're showing off now, aren't you?

"What if it's not fully penetrated?" Professor Shi Lu asked. "With low current, the penetration depth is shallow, and gaps are easily left in the butt weld."

“We can make an X-shaped bevel, leaving a 2mm blunt edge, first weld the root, then use argon arc welding to clean the root on the back, and then fill and cover it.” Jiang Xia immediately responded, “Professor Ji Luan has calculated that this way the penetration depth can reach 8mm, which fully meets the pressure resistance requirements and can also avoid slag inclusions.”

"Professor Ji Luan? Is he the one surnamed Pan? The one who started at Harbin Institute of Technology and recently went back to Beijing?"

"Oh! You know him?"

“I know him! He’s an old acquaintance. I was planning to go find him after I finished my inspection here!”

"Hey, I couldn't get through to him on the phone, how did you find him?" Teacher Shi Lu looked at the dazed boy with suspicion.

Why is this kid becoming less and less understandable?

Since I took over that project, I finally achieved some results and wanted to share them with my old friends, but either their phone lines were busy or they couldn't be reached.

How is this kid able to contact these old guys anytime?

Is it...

Hey, Brother Jiang, you're amazing! Your son is no slouch either!

I had originally hoped to find someone I could take care of...

Thinking of this, Teacher Shi Lu couldn't help but look at Jiang Xia with a maternal smile.

However, he had a very good attitude; if he couldn't figure something out, he shouldn't dwell on it. He had already understood this principle when he was homeless on the streets.

Professor Shi Lu casually put his arm around Jiang Xia's shoulder and pulled him closer: "Hey, did you know that Ji Luan failed physics when he was at Southwest Associated University?"

(?｀?Д?′)!!

Dude, you don't need to tell me about this senior's dark history!

If word gets out, I'm afraid Teacher Jiluan will charcoal me with an electric arc welder!

Fortunately, Professor Shi Lu didn't delve any further and immediately shifted the focus to a more specialized area.

The two of them started arguing back and forth about welding current, preheating temperature, beveling type, and post-heating process.

He rattled off a string of technical terms, leaving his fellow workers speechless and their initial complaints turning into admiration.

Professor Lu became increasingly alarmed as the debate progressed.

He originally thought Jiang Xia only knew a little about electronics and machine codes, but he didn't expect him to be so proficient in welding technology, and every word he said hit the nail on the head.

He knew in his heart that Jiang Xia was right; he had indeed acted according to old experience and had not taken into account the characteristics of special steel.

Jiang Xia, having successfully performed his miracle in front of others, wore a smile on his face...

Don't assume this kid is all-around good.

His ability to answer so fluently was entirely due to his in-depth discussion of this repair solution with Mr. Ji Luan, who was tinkering with electron beam welding machines in Beijing, on the "Hundred Schools Forum".

Teacher Shi Lu's questions are just a piece of cake!

what?

You don't know Teacher Jiluan?

Okay, remember that joke?

Relative: "What major are you going to study?"

Student: "Welding."

Relative: "Oh! That's great! My auto repair shop needs someone, the monthly salary is 8,000, room and board included! Do you want to consider it?"

Student: "...I'm not very good at welding cars."

Relative: "I knew it! You were slacking off at school! Tell me, what can you weld?"

The student calmly replied, "Nuclear submarines, aircraft carriers, and if we're lucky, we might even be able to weld the sealing rings for the space station in a couple of years."

This teacher is the founder of the "700 points on the college entrance exam, disappearing after entering the school" major!

The surface is welded with iron, but in reality, it's welded with the fate of the nation.

……

Teacher Shi Lu had already agreed with Jiang Xia's plan, but he felt a little embarrassed. He was speechless in front of so many people because of a junior. Where would he put his face?

In the world of martial arts, reputation is of utmost importance!

With his unique background, Mr. Lu's eyes lit up and a plan came to mind.

The specific welding process was a minor matter; what truly troubled him was another major problem. He didn't mention that it concerned the large black fish feasibility study project he was secretly involved in, but instead casually brought up a thorny issue concerning the project's overall structure:

"Suppose, I mean suppose, we want to build a new large ship that can sail underwater. In order to achieve faster underwater speed and more flexible maneuverability, we need to adopt a teardrop-shaped hull, but this brings a contradiction: the stress will be abnormally concentrated at the connection between the conning tower (sail cover) and the hull."

Especially during high-speed turns or when encountering uneven water flow impacts, this joint is prone to fatigue cracks. According to our current calculations and experiments, to ensure structural safety, the structure at this point must be significantly thickened, sacrificing weight and internal space.

Alternatively, one could strictly limit the speed and angle of maneuvering, but that goes against the original design intent. Do you think there's a fundamental solution?

Seeing Jiang Xia's open mouth, Teacher Lu, who felt he had outdone Jiang Xia, smiled happily.

But that wasn't what surprised the little guy.

He just felt that Teacher Shi Lu was too much of a江湖 (jianghu, a term referring to the world of martial arts and chivalry) type. As for face and such, why ask such a question?

You think I can't tell you're talking about a big black fish?

As for solutions, of course there are!

He pulled Teacher Shilu behind Lao Wang and the long-statured Zhao Gang, and whispered in Teacher Shilu's ear:

"Have!"

"What?"

"Wing-body fusion!"

"What?"

“Refer to the technology of integrating aircraft wings and fuselage!” Jiang Xia added, a slightly malicious smile on his face, “Design the conning tower and hull as a whole, with a smooth transition and eliminating right angles!”

"Is it feasible?" Teacher Shi Lu's voice trembled slightly.

"Yeah, right!"

The silly boy's smile was malicious.

Hehehe, Teacher Shunshou, you gave me the three-component strain balance back then, and today I'm giving you the wing-body fusion again!

This is what they call the cycle of karma!