Three days passed in a flash, and in the hall on the first floor of the refining tower, the nine furnace tripods were reduced to three.

Under the delicate operation of the swordsmiths, more than 600 kinds of sword-casting materials were synthesized into thirty-six iron ingots.

The high-intensity work made Elder Lu and the other elders of the Sword Hall a little unbearable, after all, when they were old, even if they could persevere, their concentration would inevitably decline.

Under Ye Changsheng's severe persuasion, the old people had no choice but to leave the hall and rest in the arranged residence.

It is not very difficult to synthesize thirty-six iron ingots, so the old people are not very worried.

The next few melts were the key, and they seized the time to rest, also for the rest of the battle.

Ye Changsheng couldn't rest, but sat in a wheelchair, pushed by a sledgehammer, and tossed and turned between the three furnaces.

Among all the sword forgers, Ye Changsheng's consumption was the largest, especially the consumption of mental energy, which was unimaginable.

Other swordsmiths only need to focus on the furnace ding they are responsible for, or the part of the matter they are responsible for, but Ye Changsheng has to command the overall situation.

Nine furnace tripods, hundreds of synthesizes, Ye Changsheng had to pay enough attention to ensure that they would not have any accidents.

Ye Changsheng actually trusted the swordsmiths of the Sword Hall very much, otherwise, he would not have used such a cumbersome and precise method as compound melting.

It's just that all the steps of synthesis and casting are contextual and a continuous whole.

As the designer of the program, Ye Changsheng naturally had to follow every step to ensure that the rhythm was normal.

If a step is broken, the overall rhythm will be disrupted, and under inertia, it will inevitably affect the subsequent synthesis and casting.

In the eyes of others, the busyness in the hall was well organized, like flowing water, but they didn't know what kind of calculations and deductions Ye Changsheng had experienced before, and what kind of effort he had spent to control all this in order to ensure such a rhythm.

Even with his strong mental strength, it was a bit unbearable to support it for three days.

With his spare time, Ye Changsheng swallowed two condensing pills and closed his eyes for a moment.

Thirty-six iron ingots were the size of tofu cubes, of different colors, and were neatly stacked in front of the three stoves.

Thanks to the use of composite casting, these ingots have been desulphurized and purified, and their texture is equivalent to that of a material that has been cast three times in the nine melting casting methods.

These thirty-six iron ingots will eventually be combined into one, which is equivalent to four castings.

And the final synthesis of fine iron is the real main material for sword casting.

At this stage, the requirements for heat are higher and more precise.

In addition to the swordsmiths in charge of the furnace, a large number of swordsmiths retreated, and it was time for the refiners to appear.

A large number of alchemist apprentices, controlling the mechanical golems, installed the temperature test equipment on the three furnace domes, and added several magic circle modules to control the fire.

After the nine refiners finished debugging, they each stayed in the position of operation, and at the same time said to Ye Changsheng: "Ye Gongzi, the debugging is complete, everything is normal." ”

Ye Changsheng slowly opened his eyes and said indifferently: "Let's start." ”

More than a dozen apprentices stepped forward at the same time and sent the best charcoal materials prepared by Jiang Xuenong into the three furnaces.

After the charcoal fire burned sufficiently, the refiners turned on the fire control array, and the three furnaces burst into flames.

Thirty-six iron ingots were fed into the three furnaces in order, and under the attack of high temperatures, they turned into colorful molten iron in a blink of an eye.

Ye Changsheng faced the three furnace tripods, constantly observing the color of the flames, as well as the spars above the furnace tripods, showing temperature changes, one after another, and calmly issued orders.

In the middle of the night, thirty-six iron ingots were combined into three larger iron ingots.

The two pots were removed, leaving only the largest one, still burning.

This tripod was specially transported from Wenjiantang, and it is the treasure of Wenjiantang.

Eight years ago, Changsheng's father Ye Tiexin cast this three-legged tripod, and after three years of commissioning, it was officially put into use.

At the beginning of this year, Ye Changsheng combined the casting experience of the Nine Turns Qiankun Ding to redesign and transform this Ding, not only strengthening the material of the Furnace Ding, but also adding twelve magic circle modules, so that the fire control system of this Furnace Ding is no less than that of the Nine Turns Qiankun Ding.

Transforming a tripod is far more time-consuming and laborious than rebuilding a tripod.

However, this tripod was left by his father, and it has extraordinary significance for Changsheng and Wenjiantang.

In the dark, my father's spirit in the sky will accompany this tripod to witness the release of a legendary-level long sword and the birth of a swordsmith.

Ye Changsheng's eyes were deep, looking at the flames that rolled out from time to time in the fire gate, and indifferently ordered: "Start a fire." ”

The three senior refiners of the Alchemist Guild and the three stewards of the Alchemy Tower activated the Spiritual Fire Circle at the same time.

After a few days of running-in, the three refiners had already mastered the fire control system of the furnace, and such an operation was naturally not a problem for them.

Three circles activated, purple flames, red flames, and blue flames, rising from the bottom of the furnace at the same time, drowning the flames of the charcoal fire in it.

Three iron ingots are fed into the furnace in turn.

For the first iron ingot, 32 kinds of auxiliary materials were added, and the temperature was adjusted 124 times.

For the second iron ingot, twenty-three auxiliary materials were added, and the temperature was adjusted seventy-six times.

The third iron ingot, thirteen kinds of auxiliary materials are added, and the temperature is adjusted, three hundred and seventy-eight times!

In front of the furnace, the four apprentices were sweating profusely, and their eyes were stung by sweat, but they still held charcoal pens and wrote hard, making clear notes in their notes.

At dawn, the three refiners withdrew from their positions exhausted, and Elder Lu and the elders of the Ye family also rushed to the hall.

On the shelf of the water-cooled circulation, a silver iron ingot has solidified, exquisite like a work of art, presented to everyone.

The weight of this iron ingot was enough to forge two long swords, and this was only due to Ye Changsheng's usual cautious style, not that he was not confident in a success.

Even the most perfect casting scheme may have some flaws, and even the greatest swordsmith will face failure.

Ye Changsheng is no exception, he is a human, not a god.

"Ye Changsheng, you are smart, prepare the materials for the two swords, I'm afraid that after the first one fails, you will have to be replaced!" A yin and yang strange voice came from the crowd.

At this time, the guests who were observing arrived one after another, and Ye Changsheng found a familiar face from the crowd.

Master Ouyun's disciple, Cai Zhenhua!

Isn't the Alchemist Guild closed, how did he get in?

Ye Changsheng looked surprised, and when he saw An Zhisu nodding to him imperceptibly, Ye Changsheng replied indifferently.

Cai Zhenhua stepped forward proudly, pointed to the iron ingots on the shelf, and mocked: "I thought your composite casting was amazing, but now it seems that it is just that!"

(End of chapter)