What is the welding performance of steel related to

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The welding performance of steel is related to the chemical composition of steel, followed by the melting point, expansion rate, thermal conductivity and other physical properties, as well as the welding process used. There are many factors affecting the welding performance of steel.

The welding performance of steel mainly depends on its chemical composition. The most influential element is carbon, that is, the amount of carbon in the metal stem determines its weldability. Most of other alloy elements in steel are also not conducive to welding, but their influence is generally much smaller than that of carbon.

With the increase of carbon content in steel, the hardening tendency will increase, and the plasticity will decrease, which is easy to produce welding cracks. In general, the sensitivity of metal materials to crack during welding and the change of mechanical properties of welded joint zone are taken as the main indicators to evaluate the weldability of materials. Therefore, the higher the carbon content, the worse the weldability. Therefore, the amount of carbon in steel is often taken as the main sign to judge the weldability of steel. With the increase of carbon content, the cracking tendency of welding is greatly increased. Therefore, steel with carbon content greater than 0.25% shall not be used to manufacture pressure components of boilers and pressure vessels.

Off key Uncle 2024-06-23 14:21:53

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Top ranking generally refers to the top

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Ranking top does not always refer to the top. Ranking top is an idiom in Chinese. It originally meant that when the troops of the ancient Chu State marched, if the outpost met the enemy's situation, they would give a warning. Later, "Ranking top" literally meant ranking first, describing excellent performance. Its own structure is subject predicate, which can be used as predicate, attribute and commendatory in sentences. From the Twelve Years of Zuo Zhuan Xuangong written by Zuo Qiuming in the Spring and Autumn Period: "As the ruler of the State of Chu, he chose the order and code of the State of Chu for military conduct, right shaft, and left pursuit of production. He had no foresight, power, and stamina. All officials moved like objects, and military and political affairs were not disciplined, so he could use the code."
At first sight, the idiom "Top Rank" means that Chu's army is well-trained and orderly. In fact, it reflects that Chu's morality, punishment, politics, affairs, code and etiquette are not against the rules. Such a country and army are invincible.

Emphasize sentence structure and usage

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Emphasize the structure and usage of sentence patterns. For example, emphasize that sentence patterns refer to present or future situations. Use It is to refer to the past. Use It was
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It is I who, that am wrong
Basic definition: The Emphatic Pattern is a kind of rhetoric, which is a form used by people to express their will or emotion. Emphasize a certain part of the sentence in various ways to play a rhetorical role. The commonly used emphasis structure in English is It is (was)+the stressed part (subject, object or adverbial)+who (that).... Generally speaking, when the stressed part refers to people, when the who refers to things, it uses that, but that can also refer to people. In American English, which is often used instead of that
Common sentence patterns:
1. The emphatic sentence pattern of declarative sentences:
It is, was+emphasized part (usually subject, object or adverbial)+that/who (when emphasizing subject and subject refers to person)+other parts.
It was yesterday that he met Li Ping
2. The emphatic sentence pattern of general questions:
Same as above, just mention is and was before it.
Example: Was it yesterday that he met Li Ping
3. The emphatic sentence pattern of special questions:
The emphasized part (usually interrogative pronoun or interrogative adverb)+is, was+it+that, who+other parts.
Example: When and where was it that you were born

Is Sun Jing a historical figure

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Sun Jing is a historical figure, a famous statesman and strategist of the Han Dynasty, and the hero of the "hanging beam" in the idiom "hanging beam and stabbing shares".
Sun Jing was a native of Xindu (today's Jizhou District, Hengshui City) in the Han Dynasty. He was eager to learn at a young age, learned extensively and memorized well, and regarded books as his life. Reading and studying at night often stay up all night. The neighbors called him "Mr. Closer".
When Sun Jing was reading, he kept taking notes at any time. He often saw it in the second half of the night. As time went by, he sometimes fell asleep. When I woke up, I felt regretful again. One day, when he looked up and pondered, his eyes stopped on the beam of the room, and suddenly his eyes lit up. Then he found a rope, one end of which was tied to the beam, and the lower end was tied to his hair. In this way, whenever he is tired and sleepy and wants to doze off, as long as his head is lowered, the rope will suddenly pull his hair, and a pain will wake him up and drive away the drowsiness. From then on, he used this method to study hard every night. Years of hard work enabled Sun Jing to read poetry and become a knowledgeable scholar. At that time, he was quite famous north of the Yangtze River and Huaihe River, and students from thousands of miles often came to him to learn and discuss knowledge.

Does the temperature rise with the increase of internal energy

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When the internal energy of the object increases, the temperature does not necessarily increase. The size of internal energy is related to the mass, volume, temperature of the object and the kind of substances that make up the object. For example, when the crystal melts or the liquid boils, the temperature remains the same, but it needs to absorb heat and the internal energy increases.
In general physical problems (not involving the excited ionization of electrons, chemical reaction and nuclear reaction), only the molecular kinetic energy and potential energy will change in the internal energy. At this time, we only care about these two parts, and define the sum of these two parts as internal energy. This is a simplified definition, namely internal energy in a narrow sense. When it comes to excited ionization of electrons, chemical reaction and nuclear reaction, in order not to cause misunderstanding, internal energy in the narrow sense should be strictly called thermodynamic energy (formerly called heat energy, which is still widely used in some engineering fields).

What is the welding performance of steel related to

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