In the absence of a large ton of hydraulic press, Guo Dalu can only put together a small piece of steel, and the method of splicing is hot welding - that is, the edges of the two steel plates are put together, and then the molten steel is poured in the gap, and after the molten steel cools, the two steel plates are put together.

To be honest, this kind of hot splicing is not a good way, Guo Dalu has thought about riveting or electric welding, but the process is temporarily unsolved, so can only use this simplest thermal welding.

However, the welding strength of the molten steel is obviously not enough, and the steel parts of the furnace body have undergone secondary thermal welding when they are assembled, and now, these welding parts are torn apart by the gravity of the steel parts themselves, which caused the accident.

Guo Dalu and Li Dayan found several cracks on the half-finished furnace body, the two glanced at each other, shook their heads together, Guo Dalu sighed: "It seems that hot welding with molten steel is not possible, such a furnace will fall apart at a little fire, where is this blast furnace, it is simply a super bomb, stop working, let me think of another splicing method." ”

Guo Dalu returned home, thought hard for a day, but still no good way, such a blast furnace, electric welding is the best, but he has to get the generator out first - the power of the solar charging panel is too small, to charge the mobile phone, used to supply power to welding, even if Guo Dalu to get the AC and DC transformer out, it is not possible. Of course, it is also an idea to let the cloud whites supply the power, but the voltage cannot be precisely controlled.

At night, Guo Dalu couldn't sleep for a while while lying on the bed, so he simply turned over and got up, and went to the grove in the back mountain.

Guo Dalu cautiously walked into the grove to confirm that he was not being followed, but saw that there was a person in the grove, it was Huang Manyuan, but it turned out that he was routinely cleaning up the garbage, and when he saw Guo Dalu coming, Huang Manyuan did not say hello, but curiously fiddled with a thing in his hand and knocked it with his fingers: "What is this? Is it made of steel? or is it made of silver?"

Guo Dalu saw at a glance that what Huang Manyuan had in his hand was a pressure cooker, that's right, an aluminum pressure cooker. Huang Manyuan had never seen aluminum, and mistook the metal for steel or silver.

Guo Dalu wondered in his heart, what kind of loser was this, who actually threw a pressure cooker into the trash? He took the pressure cooker, and after a careful inspection, he found that the pressure cooker had actually been blown up.

It turned out that for some reason, the pressure cooker had its vents and pressure valve blocked by dirt, and as a result, the huge steam pressure in the pot had nowhere to go when it was boiling, and the pressure cooker turned into a large bomb and exploded in the kitchen.

Guo Dalu looked through other garbage and found the fragments of the tempered glass stove that was blown up, which further confirmed his conjecture, thinking that the original owner was fatal, and the pressure cooker was not in the kitchen when it exploded.

Guo Dalu knocked on the pressure cooker that was thrown away by the owner who had palpitations as a bad thing, and said to Huang Manyuan: "This pot is not steel or silver, but made of aluminum." This aluminum, but it's a good thing, this thing can't be refined by ordinary smelting methods, it has to be electrolyzed--"

Guo Dalu was suddenly stunned, he jumped high, if he hadn't thought of himself in the grove in time, he almost cheered: "Thermite! Aluminum powder is the best raw material for welding! The blast furnace is saved now!"

Aluminum, aluminum powder, this thing is an excellent raw material for making incendiary bombs, and it can even be used to burn through the armor of a tank! Guo Dalu has watched "Breaking Bad", and that superb chemistry teacher used a bag of aluminum powder to burn the heavy iron lock of the chemical warehouse door.

Using aluminum powder as flux instead of molten steel can greatly enhance the strength of the blast furnace steel plate!

Guo Dalu said to Huang Manyuan: "Quick, look for it, there are still things that are not used for aluminum in the garbage that were buried before." ”

The two of them pouted their butts and dug for a while, and really found some aluminum products, including woks, shovels, lunch boxes, kettles, etc., and the most exaggerated thing is that they actually found half an aluminum alloy fan, I really don't know how this thing was thrown into the trash.

Guo Dalu rubbed his hands excitedly, turning these aluminum products into aluminum powder, which is enough to weld the furnace body.

The next day, Guo Dalu called Li Dayan and others to the workshop, instructed everyone to put the two steel plates in the casting mold, the edges were aligned, and beckoned Brother Hao'er: "Go, get some iron powder." ”

Guo Dalu took out the aluminum powder he had made last night from his pocket and mixed it with iron oxide powder, which was thermite.

He then heated the powder in a crucible, and soon the mixed aluminum and iron powder underwent a reductive exothermic reaction and became a liquid state. Guo Dalu carefully picked up the crucible and injected molten metal into the mold. Suddenly, sparks splashed around, and liquid metal flowed into the joint void, forming weld metal.

The two steel plates were welded into one.

After the welding liquid cooled, Li Dayan knocked on the hammer and said in surprise: "This is much stronger than hot pouring of molten steel!"

Guo Dalu also used the power of merit in his body, carefully inspected the welding part, and sure enough, he "saw" that there were almost no bubbles and impurities inside.

Brother Hao looked at the aluminum powder curiously: "What kind of powder is this? shiny, non-steel and non-silver." ”

Guo Dalu said: "This is aluminum powder, which is the best for welding." It's just that it's not easy to get this thing, and for the time being, I can't refine it from the ore by myself, so we should be careful with aluminum powder, otherwise it will delay the manufacture of the furnace. ”

Under the guidance of Guo Dalu, everyone quickly learned to weld with thermite, this welding method does not require additional power supply, heat source, as early as the nineteenth century, has been widely used in welding rails, there is no difficulty in construction, so that the splicing speed of the furnace body has been accelerated a lot.

Half a month later, the first blast furnace of the Da Li Dynasty finally stood up in the mountain behind Houlong Village, it was like a silent iron giant, when it began to have life and spew fireworks, it was destined to shock the whole world!

In the furnace, coke, selected iron ore, and limestone have been stacked layer by layer, Guo Dalu held a torch in his hand, standing at the ignition port, he turned his head and nodded to Carpenter Zhou, Carpenter Zhou pulled out an iron pin head, and suddenly, the fan driven by the water wheel began to rotate, Guo Dalu shouted: "Ignition!" He threw the torch into the furnace, the red light flashed, and the coke burned brightly. (To be continued.) )