Chapter 102 Aluminum and Steel: How can we fall in love with different personalities?

 Compared with steel, aluminum alloys have higher strength at the same weight. Therefore, in order to reduce weight, many equipment will choose to use aluminum alloys. The earliest one was in the aviation industry, and then expanded to the automotive and other industries.

In the field of shipbuilding, aluminum alloys have also begun to be used in large quantities internationally. However, there is a big problem in welding aluminum alloys to steel.

The melting point of aluminum alloy is only six to seven hundred degrees, while the melting point of steel is more than a thousand degrees. Therefore, if ordinary welding methods are used, the aluminum alloy will melt first, but the steel will still be in solid form. In this way, the melted aluminum alloy will Floating on top of the steel, even if part of it fuses together, the weld will be uneven.

How can people with different personalities fall in love? How can people with different personalities be fused together?

 At this time, Meng Fansheng raised a very serious question.

 Qin Tao looked at Meng Fansheng happily. This man looked ordinary, but his mouth was relatively big. When he spoke, his mouth shape would constantly change, and his big mouth would dance on his face.

“Yes, it seems that aluminum alloy and steel are not easy to weld together.” Zhao Ling was also a little worried at this time.

"Everyone, think about it, if aluminum alloy and steel are not easy to weld, how can ships from other countries realize that the lower hull is made of steel and the upper building is made of aluminum alloy? Are they riveted together?" Qin Thao asked rhetorically.

 Hearing this, everyone was stunned.

 Yes, it has become a popular trend abroad, which means that this problem has been solved long ago!

“Gong Qin, can you tell us how to weld?” Zhao Ling asked.

 Qin Tao rolled his eyes at him. Aren't you used to calling him Brother Tao before? Why did you change your tune again? However, now that Zhao Ling is a representative of the military stationed in the factory, it is appropriate to keep some distance from herself.

In front of the other two people, Qin Tao couldn't care about this. Facing the expectant eyes, Qin Tao said: "Currently, there are several main ways to weld aluminum and steel. Friction welding uses friction to join two metals. To be suitable for this kind of welding, one of the workpieces should be shaft-shaped."

This is easy to understand. If a column is welded to a steel plate, then the column is rotated. The bottom end of the column rubs against the steel plate to generate heat and is eventually combined together.

“Explosion welding, this is suitable for welding aluminum plates and steel plates.”

“Explosion welding?” Several people almost said it in unison. They did not expect that such a violent method existed in the field of welding.

"Yes." Qin Tao looked at Meng Fansheng's big mouth with a smile: "Explosive welding refers to using the shock wave generated during the detonation of explosives to drive metal movement at high pressure, colliding on the surfaces of the two metals, forming a jet, and removing the surface film , a welding method that forms a metallurgical connection under the action of high pressure shock waves. Because it is instantaneous welding, the entire workpiece will not be affected by high temperature and will only melt at the welding joint. This weld often forms a wavy interface and has high bonding strength. The interface resistance is small. The explosive welding equipment is simple and the production cost is low, making it suitable for industrial production."

“The third method is brazing, which uses a gas welding flame as the heat source to melt the lead solder for welding. If the requirements for the weld are not high, you can also use aluminum electrodes for welding.”

Who says aluminum and steel can't be welded together? Qin Tao provided three methods.

Hearing Qin Tao's words, everyone present nodded. Meng Fansheng's big mouth continued: "So, what welding technology does your shipyard have?"

 “Not yet.” Qin Tao was sincere.

The news came so fast. Qin Tao originally thought that it would be a few months before the Navy would urge the construction of missile boats. Who would have thought that now they have agreed to build the catamaran? The master welder at the shipyard We are all busy welding the dredger. Even if we occasionally practice welding technology, it is still aluminum alloy welding, and it does not involve the welding technology of aluminum and steel.

I had to eat the rice in one mouthful, but before I could finish the chicken legs, a large pot of braised pork was served.

 You have to eat even if you can’t eat it!

 Have you been talking for a long time, isn’t it in vain?

“Qin Gong, you mean, there is not yet, but there will be in the future?” Zhao Ling asked.

Sure enough, Zhao Ling is still considerate. Qin Tao nodded. It would be much more convenient to have someone to praise him.

“Yes, if the Navy decides to use aluminum alloy for the superstructure, then we can immediately hire a specialized welder master to train our welders, or personally help complete the welding of aluminum alloy and steel hull.” Qin Tao said.

If you want to use it, we will find a way. If you don't use it, then we won't bother. This is what Qin Tao means now. After all, the construction period of the dredger is also very tight.

"Well, we have to try it before we know. First, let's see if your welding results can meet the needs of the navy." Meng Fansheng said.

Qin Tao was helpless: "So, you don't require aluminum alloy for the hull, right?"

Meng Fansheng shook his head: "The navy is not that luxurious yet."

 In fact, hull steel and superstructure aluminum alloy are a more suitable matching solution. If the entire hull is made of aluminum alloy, the hull can be made lighter, but there is also a big problem that cannot be solved.

 In addition to the high cost and the fact that it can be burned, the bigger problem is the corrosion of sea water. There is salt in sea water. For ordinary steel, just a few more layers of paint can still protect the steel from corrosion, but aluminum alloy cannot. No matter what paint or formula is used, it cannot solve the problem below the water line of aluminum alloy. corrosion problem.

Therefore, when the majestic and domineering catamaran missile boat was launched in the time and space before Qin Tao was reborn, after discovering this problem, after several studies, he finally used the simplest method: as long as he comes back from the sea, he can directly use a crane to handle it. This kind of catamaran guided missile boat is hoisted to the launching ramp on land to bask in the sun, leaving only three or four duty boats floating on the water at the dock.

 Once assigned a mission, these missile boats can quickly slide into the seawater and attack collectively. This big problem is solved simply and directly, and the wisdom of the East shines through.

Now, Qin Tao and the others have used high-strength steel. They have even begun to run rampant at the customs and are invincible, demonstrating the strength of this catamaran. Therefore, the army does not need to require aluminum alloy hulls.

Qin Tao nodded: "Okay, then I will ask the welder master to come over tomorrow and show you. Our shipyard has already built two catamarans and has rich experience. Even if I am not here, they can start tomorrow. Welding the hull, by the way, it would be better if you could send one person to go with me."

Zhao Ling nodded: "The part I am responsible for requires the hull to be welded before the outfitting can begin. I can go with you."

 (End of this chapter)