The technical system of Donghai Shipyard is taking action quickly.

Welding site.

Not only were there many backbone technicians in charge of welding, but even Zheng Xianxue, director of the Engineering and Technology Department of Donghai Shipyard and Li Chaolin, deputy director, came.

There were many people around Wu Mingze.

In addition to technicians, there are also production managers and some workers. The focus of this moment is Wu Mingze.

The atmosphere at the scene was very solemn.

At the request of Zheng Xianxue, Wu Mingze welded another test piece. Under the light, multiple pairs of eyes were staring at this time, and no one spoke for the time.

After a while, Zheng Xianxue looked bitter and shook his head gently.

Li Chaolin also sighed.

Although the others failed to come over to see the test piece, they knew that the welding was definitely not ideal, and there were mostly microcracks.

After thinking about it, Zheng Xianxue prepared to ask for another test piece to be welded.

Before welding, he personally communicated with Wu Mingze for a long time and changed some welding parameters, such as the welding current magnitude, and then changed.

After a while, in everyone's eyes, the welding began again.

However, when the welding was completed and the weld was checked, including Zheng Xianxue, his heart was still cold, and there were still welding cracks.

This seems to be a stubborn disease, no matter how it changes, it always exists.

Zheng Xianxue looked serious and began to think.

Is the welding parameters wrong?

Or is there any problem with the welding material itself?

He thought a lot and temporarily decided not to welding anymore. Instead, he instructed the technicians below to send some samples to the metallographic analysis room to conduct metallographic analysis of welding materials, welding specimens, etc. to see if there is any problem with the material.

Many days in a row.

At a loss.

Metallographic analysis believes that there is no material problem with welding materials and welding specimens and is completely within the qualified range.

Then why do weld cracks always occur?

The entire Donghai Shipyard technical system does not understand what this is going on for the time being. It is helpless and the welding cracks cannot be overcome for the time being.

Chen Shaohua was a little anxious and angry.

The material preparation workshop is progressing well, the hull stake is going smoothly, and the steel plate cutting is also progressing well. Some steel plates that have been cut and the welding bevels are opened are sent to the sectional manufacturing workshop.

If there are no welding cracks, the sectional manufacturing workshop can even begin preparing the welding work of each section.

But because of the welding cracks, they could not move.

The Donghai Shipyard held a special meeting, not only Chen Shaohua and Xie Xinjian, but also some senior management personnel, and the most were technical systems.

When such a problem arose, everyone looked solemn.

Chen Shaohua said: "Comrades, it has been so many days since the problem occurred. This problem has affected our segmented manufacturing. If this continues, it will inevitably affect the construction of our first ship."

"At this time, our technical system needs to come up with a solution. I will give you another three days. Within three days, we must solve this problem."

He issued a final time to the technical system to solve the problem.

Suddenly, the entire technical system of Donghai Factory was under great pressure, especially Zheng Xianxue, who was the Minister of Engineering and Technology, his face suddenly became serious.

Three days.

In just three days!

Zheng Xianxue has no idea of ​​solving the problem of welding cracks, but he has no confidence that he can only bite the bullet.

Therefore, within the next three days, the segmented manufacturing workshop of the Donghai Shipyard will be brightly lit, even at night, from day to night, and from night to day...

There were not a hundred test pieces welded, at least dozens of them. Various parameters and welding methods were tried, but the welding cracks were still unable to be solved.

Wu Mingze, who had been in for another night and had bloodshot eyes, said: "Minister Zheng, it is not a solution to this. Even if we give us three days, or even thirty days, we may not be able to solve this problem."

Zheng Xianxue also stayed up all night, his eyes were covered with blood. He sighed softly, fully agreeing with Wu Mingze's point of view.

Why do welding cracks occur?

They figured out half of this problem, and the material's solderability is too poor.

The strength of this alloy steel from 052 is more than twice the strength of other steels. The higher the strength, the more alloy elements it adds. The more alloys it has, the more difficult it is to welding and the worse weldability.

In three days, the problem of welding cracks was still not solved.

Zheng Xianxue found Chen Shaohua with bloodshot eyes and lowered his head to report the situation. Looking at Zheng Xianxue who had been in a row for three nights, Chen Shaohua did not blame him, but just sighed.

After thinking about it, he thought in his heart that he might need to ask for help from the design unit.

.........

East China Sea Ship Design Institute.

Just now, Yang Fan went to his new house and looked at all the furniture there with satisfaction, which completely met his request.

The quality of Master Pan and his son is really good, and he gave Yang Fan a surprise. Every cabinet and every piece of furniture are made very beautifully and beautifully, and the quality is also very good.

All the things are done, and the next thing is paint.

After painting, the decoration of the new house has entered the final work. Just brush the walls, clean them, install curtains, and move some or buy some daily necessities.

These jobs are not urgent, you can take it slowly.

According to Yang Fan's plan, after the renovation of the new house is completed, it will be vacant for at least two or three months. After the smell of paint has completely dissipated, then we will consider getting married and moving into the new home.

I returned to my office with satisfaction and took a sip of tea with a tea cup.

I thought to myself, I haven't been to the Donghai Shipyard for a long time, and I don't know how their construction is going. Will I encounter some problems?

As a design unit, everything is not going to be fine after drawing the design drawings, but it is necessary to pay close attention to and track the construction situation.

What problems are needed during the construction process? They need to be collected and recorded, whether design improvements and improvements are required, etc.

Yang Fan decided that tomorrow, the day after tomorrow, we must go to the Donghai Shipyard to check out the construction of the first ship.

Just as I was thinking about this, there was a knock on the door outside.

I saw Chen Shaohua pushing the door and coming in.

When Yang Fan saw that it was Chen Shaohua, he was stunned and said in his heart, this is such a coincidence!

I was thinking about the construction of the first ship just now and planned to go to the Donghai Shipyard to take a look. Our Chief Construction Engineer Chen came here in person.

You won’t go to the Three Treasures Hall without any trouble.

He hasn't been here for almost ten days, and this time he came to Donghai Institute, what should be happening?

Yang Fan guessed this in his heart, and soon noticed Chen Shaohua's expression. He immediately realized that the expression of Chief Construction Engineer Chen was wrong.

I guess something happened.

Although she was thinking this in her heart, Yang Fan did not hesitate at all in his movements, and immediately showed a warm smile, stood up and greeted: "Mr. Chen, I'm here today."

Chen Shaohua's face was not good.

It appears in a dark color, and its brows are slightly frowning.

All of this shows that he is not in a good mood and may have encountered something.

Yang Fan enthusiastically poured him a cup of tea, and then asked with concern: "Mr. Chen, you look like you are in a bad mood. What's wrong? You have encountered some problems."

Chen Shaohua smiled bitterly, "I did encounter a problem, and it was a big problem. I came here to find Chief Secretary Pan, but he seemed to be not here."

Yang Fan said: "He went out for a meeting and would not be back tomorrow."

When Chen Shaohua heard that Pan Jinfu was not at home, he sighed.

He thought to himself, what should I do?

Our Donghai Shipyard cannot afford to delay. If the welding problem is not solved, the sectional manufacturing workshop will not be started, which will inevitably affect the construction process of the first ship.

Yang Fan observed his expression and expression.

"What's the matter with Chief Secretary Pan? Can you tell me?"

Chen Shaohua did have the idea of ​​having a good chat with Yang Fan, so he briefly said the situation, and after that, he sighed helplessly.

"We are afraid that the problem of welding cracks will not be solved in a short period of time. We just want to ask whether this microcrack can be allowed in design."

After saying that, he took out two test pieces from the briefcase he was carrying, wrapped them in newspaper, opened the newspaper, and gave the test pieces to Yang Fan.

Picking up one of the test pieces, Yang Fan looked at them carefully.

There are indeed microcracks, not obvious, and there is still something that cannot be seen if you don’t look closely.

After reading it, Yang Fan said: "The subversive problem of weld cracks is definitely not allowed in design. Once the hull also cracks due to weld cracks, this is a fatal problem. Chief Engineer Pan will definitely not shoot this board."

Upon hearing this, Chen Shaohua's expression dimmed.

This time he came here with a slight hope. Whether this is possible is the design to allow a small number of microcracks in the weld.
To be continued...