Military Heavy

Chapter 158 The Insurmountable Welding Crack ([-]rd update)
The technical system of Donghai Shipyard moved quickly.

Welding site.

Not only did a number of backbone technicians in charge of welding come, but also Zheng Xianxue, the director of the Engineering Technology Department of Donghai Shipyard, and Li Chaolin, the deputy director, also came.

There are many people around Wu Mingze.

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

The atmosphere at the scene was very dignified.

At the request of Zheng Xianxue, Wu Mingze finished welding another test piece. Under the light, many pairs of eyes were fixed on this time, and no one spoke for the time being.

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

Li Chaolin also sighed.

Although the others couldn't come over to see the condition of the test piece, they knew from the eyes of Minister Zheng that the welding was definitely not ideal, and most likely there were microcracks.

After thinking about it, Zheng Xianxue was going 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.

After a while, under everyone's gaze, the welding started again.

But when the welding was completed and the welds were inspected, Zheng Xianxue and others felt a chill in their hearts, as there were still welding cracks.

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

Zheng Xianxue looked serious and began to think.

Are the welding parameters wrong?

Or is there a problem with the welding material itself?
He thought a lot, and decided not to weld for the time being, but ordered the technicians below to send some samples to the metallographic analysis room to conduct metallographic analysis on the welding materials, welding test pieces, etc., to see if there were any problems with the materials.

For many days.

Nothing can be done.

According to the metallographic analysis, there is no material problem in the welding materials and welding test pieces, which are completely within the qualified range.

Then why do welding cracks always appear?
The technical system of the entire East China Sea Shipyard does not understand what is going on for the time being, and is at a loss, and the welding crack cannot be overcome for a while.

Chen Shaohua was a little impatient and angry.

The progress of the material preparation workshop is good, the hull lofting is going smoothly, and the steel plate cutting is also progressing well. Some steel plates that have been cut and welded beveled have been sent to the sub-manufacturing workshop.

If there is no such thing as welding cracks, the segment fabrication shop can even start preparing the welding work of each segment.

But they couldn't move because of weld cracks.

Donghai Shipyard held a special meeting, attended by not only Chen Shaohua and Xie Xinjian, but also some senior management personnel, and most of them were people from the technical system.

When such a question came up, everyone looked dignified.

Chen Shaohua said: "Comrades, it has been so many days since the problem occurred. This problem has affected our segmental manufacturing. If this continues, it will definitely 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 last-minute resolution to the technical system.

Immediately, the entire technical system of Donghai Factory was under tremendous pressure, especially Zheng Xianxue, who was the head of engineering technology, suddenly became serious.

Three days.

Just three days!

Zheng Xianxue didn't have a clue, he didn't have the slightest confidence to solve the problem of welding cracks, but if he was not sure, he could only bite the bullet.

Therefore, in the next three days, the segmented manufacturing workshops of Donghai Shipyard will be brightly lit, even at night, from day to night, and from night to day
There are not a hundred of the test pieces welded, at least dozens of them. Various parameters and welding methods have been tried, but the welding cracks still cannot be resolved.

After staying up all night again, Wu Mingze, whose eyes were bloodshot, said: "Minister Zheng, it's not an option to go on like this. Even if we give us another three days, or even 30 days, it may not necessarily solve this problem."

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

Why do welding cracks occur?
They figured out half of this problem, the weldability of the material is too poor.

The alloy steel of the 052 ship is more than twice the strength of other ship steels. The higher the strength, the more alloying elements are added in it. The more alloys, the more difficult the welding and the poorer the weldability. .

For three days, the problem of welding cracks was still not resolved.

Zheng Xianxue found Chen Shaohua with bloodshot eyes, lowered his head and reported the situation, looking at Zheng Xianxue who had stayed up all night for three consecutive 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 the design unit for help.

Donghai Ship Design Institute.

Just now, Yang Fan went to his new house again, and satisfactorily looked at all the finished furniture there, which fully met his inner requirements.

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

Everything is done, the next thing is just paint.

After the paint is painted, the decoration of the new house enters the finishing work. It is enough to paint the walls, do some cleaning, install curtains, move some or buy some daily necessities.

There is no rush for these tasks, you can take your time.

According to Yang Fan's plan, after the decoration of the new house is completed, it will be vacant for at least two to three months, and the smell of paint will dissipate before considering marriage and moving into a new home.

Satisfied, he returned to his office and took a sip of tea from his teacup.

I thought to myself, I haven't been to Donghai Shipyard for a long time, I don't know how their construction is progressing, will they encounter some problems?

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

If there are any problems in the construction process, they need to be collected and recorded, whether to improve and perfect the design, etc.

Yang Fan decided that tomorrow, or the day after tomorrow at the latest, he must go to Donghai Shipyard to take a look and learn about the construction of the first ship.

While thinking about this, there was a knock on the door.

I saw Chen Shaohua pushing the door and coming in.

Seeing that it was Chen Shaohua, Yang Fan was taken aback, and said in his heart, what a coincidence!
I was still thinking about the construction of the first ship just now, and I planned to go to Donghai Shipyard to take a look. Our chief builder Chen came over in person.

bother you for something.

He hasn't been here for almost ten days, so there should be something to do when he comes to Donghai Institute this time.

Yang Fan guessed in his heart, and soon noticed Chen Shaohua's expression, and immediately saw that the expression of the chief builder Chen was not right.

Guess what happened.

Although he was thinking so in his heart, Yang Fan did not hesitate in his actions, and immediately showed a warm smile, got up and greeted: "Mr. Chen, you are here today."

Chen Shaohua's complexion was not good.

It showed a gray color, and his brows were also slightly wrinkled.

These all show 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 seem to be in a bad mood. What's the matter? You have encountered some problems."

Chen Shaohua smiled bitterly, "I have indeed encountered a problem, and it is still a big problem. I came here specially to find General Master Pan, but he doesn't seem to be here."

Yang Fan said: "He went out for a meeting and will come back tomorrow."

Hearing that Pan Jinfu was not at home, Chen Shaohua sighed.

I thought to myself, what should I do?

Our Donghai shipyard cannot afford to delay. If the welding problem is not solved, the sub-section manufacturing workshop will not be able to start, which will inevitably affect the construction process of the first ship.

Yang Fan observed words and expressions.

"What do you want to ask Master Pan for? Can you tell me about it?"

Chen Shaohua really wanted to have a good chat with Yang Fan, so he briefly explained the situation, and after finishing speaking, he sighed helplessly.

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

After speaking, 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 it carefully.

There are indeed micro-cracks, not obvious, and you can't see it without looking closely.

After reading it, Yang Fan said: "Subversive problems such as weld cracks are definitely not allowed in the design. Once cracks appear on the hull due to weld cracks, this is a fatal problem. Master Pan will definitely not Take this board."

Hearing this, Chen Shaohua's expression darkened.

He came here this time with a sliver of hope, whether there is such a possibility, the design allows a small amount of micro-cracks in the weld.

In fact, he also knew that this was probably not allowed, but he didn't give up if he came to ask.If it is allowed, they can start welding the sections of the 052 ship.

Sure enough, it is not allowed!

If Yang Fan said it was not allowed, it must be not allowed.

Chen Shaohua knows Yang Fan's level.

Seeing Chen Shaohua's expression, Yang Fan couldn't bear it, and after some comfort, his face looked better.

After drinking tea for a while, Chen Shaohua was about to leave.

When he got up, he looked at the time and invited: "Director Yang, I will come to pick you up tomorrow, come to our place to have a look, and help us think of a way."

Yang Fan really wanted to go to Donghai Shipyard to have a look, but now that there is a welding crack, he wants to see the situation even more, and replied loudly: "Yes, no problem."

Chen Shaohua invited Yang Fan to take a look, but he didn't dare to hold out too much hope. As for the problem of welding cracks, there are so many welding technicians in Donghai Shipyard, they have nothing to do, and Yang Fan probably won't have anything to do.

Invite Yang Fan to come over, just because Yang Fan represents the design unit, if something goes wrong, the design unit will definitely send someone to take a look.

After Chen Shaohua left, Yang Fan sat down and quietly thought about the welding crack.

(End of this chapter)