Is there a remedy for a large marine propeller if something goes wrong?

The answer is naturally yes, take the basic process of casting as an example, if there are bubbles, cracks and other defects, you can use the repair welding process to solve.

However, this process is extremely demanding, after all, the material of the marine propeller, its own structure and the unique working environment have created such large marine components to be extraordinary, which is why the processing technology is very demanding.

Take the most common material as an example, most of the large marine propellers use brass or bronze alloys, and copper and its alloys due to low melting point, high thermal conductivity, large coefficient of thermal expansion, large solidification rate shrinkage, strong affinity with oxygen in the liquid state, large solubility of hydrogen in it, etc., so that it produces great stress and deformation in the welding process, and the tendency of the weld to form pores and cracks is large.

In addition, due to the metallic properties of copper, the process of cooling and crystallization of the metal during welding is accelerated, preventing the entrapped or dissolved gases in the arc column from escaping from the weld metal or near the seam. Gases remaining in the metal can easily cause supersaturation of gases, and the formation of supersaturated solutions can lead to cracks or create pores.

As for the high thermal conductivity, it is necessary to concentrate a strong heat source when welding copper alloys, and at the same time, it needs to be preheated, which can lead to the expansion of the heat-affected zone and the embrittlement of the structure.

It is for the above reasons that the copper alloy propeller is not that it cannot be welded, but it is very difficult to weld, and the equipment and materials are secondary, and the key is the experience of the operator.

It's like a good Manchu and Han banquet on a table, the same ingredients and seasonings, the experienced master, and the taste made by the rookie who has just come out of the apprentice are absolutely different, and the reason is experience, even if you can't see or touch, but it exists.

Endeavor Factory can know the problem of the propeller from the Han'e Shipyard, and naturally knows the remedy, but why is it that it is not successful, without him, and without experience, so that the welder who got started either used too much force to weld the propeller waste, or a few taps are better than nothing.

The same is true in the casting process, without the accumulation of experience, the control of the heat, and the grasp of the timing, we don't know at all, and we can only achieve accumulation through making mistakes again and again, and then summarizing again and again.

The key is that Endeavor Factory has the intention to do this, but how can foreign businessmen have this time to play with you?

So when they found that Endeavour was close to the key core components, they chose to leave without hesitation.

Similarly, when they heard Liang Mingqiu's bland word "repair welding", they were surprised, but also stopped, because for such a long time, they had never heard of Endeavor Factory having this ability, whether it was surprised or curious, it was always right to stay and see what was going on.

In particular, Rutherford, a person who understands the shipbuilding process very well, is very aware of the difficulty of propeller repair welding, and the shipyards with this ability are all large factories with top technology, and this kind of people are all baby bumps in the factory.

Rutherford has been in the Endeavor factory for almost half a year, and he has never heard of such a cattle person in the Endeavor factory, but just now he suddenly heard that someone wanted to repair the propeller, so he couldn't believe it, so with a little doubt, to see what tricks the Chinese played.

Ekta didn't know the advanced technical knowledge, but he also knew that the technology of the remedial propeller was not ordinary, so he simply stayed.

As for Master Tian, he was confused, he knew that he had tried to repair welding, but he had never succeeded, and he didn't know if the newcomer Liang Mingqiu had this ability, of course, this is not a matter, the question is whether you can discuss with me, an old comrade, before you kid makes a decision, don't think about it as a play, what if you don't hold it?

"Tian, why don't you speak? Could it be that you're playing tricks on us again?"

Seeing that Master Tian was stunned, Rutherford subconsciously thought that it was another delaying trick of the Endeavor Factory, which was used by their factory director Meng once three days ago, so it is difficult for the workers under the leadership of the factory director to say that they will not learn from it.

"This ......" Master Tian didn't know how to answer, so he could only pretend to pick up the walkie-talkie and ask, "Xiaoliang, are you sure?"

"Yes!"

Liang Mingqiu's answer was concise and powerful, but it was that Master Tian almost didn't hold back his internal injuries, and he could die if he could say two more words, but he couldn't help it, so he could only be a dead horse as a live horse doctor, which was better than just letting two foreign businessmen go to the factory to make trouble, at least delay a little time, and also give Director Meng and them a way to deal with it.

So the honest Master Tian also let go at this moment, turned on the drama mode, put down the walkie-talkie and said with a look of hope: "Mr. Rutherford, you also heard it, our Comrade Liang Mingqiu is very sure." ”

"Liang Mingqiu, why haven't I heard of it?" Rutherford asked with a frown.

"Because he used to work and study in a large shipyard in Jiangnan, during which he also worked as a trainee worker in the marine engineering workshop of the Yokohama shipyard in Japan for half a year, and served as the chief technician of the marine machining workshop of a shipyard in Jiangnan for more than a year after returning to China, so don't look at him young, he is very experienced in marine propellers.

Take our castings that have failed several times, it took more than half a month for the experts of the Han'e Shipyard we hired to figure out the problem, Xiaoliang took less than a day to figure it out, it was because of his ability in this area, we were transferred by the director of the factory to improve the technical ability of our propeller parts processing, but he is more introverted, so he is not very gregarious, you two forgive me......

Master Tian's attitude is very sincere, and his tone is also very kind, a style of painting of high-ranking party officials in the headquarters, but he is about to vomit in his heart, he has never opened his eyes and said nonsense for most of his life.

I'm a drop-out student who was kicked out by a shipyard in Jiangnan, and the reputation of Lao Tzu's duty was all abolished by your kid, waiting for this gust of wind, I have to ask your kid to eat.

Rutherford and Acta didn't know Master Tian's mental journey, and they both felt that the honest and honest Master Tian was very reliable, even if there was an unreliable factory director, it couldn't change the essence of Master Tian, so the two of them nodded without doubt, and at the same time they were more curious about Liang Mingqiu, so they turned around and went back, wanting to see how this big cow in Master Tian's mouth repaired the propeller.

At this moment, Liang Mingqiu had already adjusted the argon arc welding machine, and then took the grinding wheel and began to grind around the cracks, and then used acetone and sandpaper to remove the oxides on the specially processed high-tech aluminum welding wire.

When everything is taken care of, Fang turns on the argon arc welding machine, buckles it, lies on the temporary working face, and begins to carry out the welding operation without distraction.

When Rutherford and Antak returned, they saw the scene of Liang Mingqiu starting to weld, and they couldn't help but look at each other, and they both saw a sense of amazement in each other's eyes.

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