What is electroslag pressure welding?

Question 1: Electroslag pressure welding is a welding method in which two rod-shaped metals are placed at the vertical butt joint, and an electric current passes through the gap between the ends, forming an arc process and an electroslag process under the flux layer, generating arc heat and resistance heat, melting the metal ends and completing the connection through pressure.

Electroslag pressure welding is mainly used to weld vertical steel bars in reinforced concrete construction projects.

Question 2: What does electroslag pressure welding mean? Electroslag pressure welding (ESW): It is a pressure welding method that two steel bars are placed vertically or obliquely (the inclination is in the range of 4: 1), and the welding current passes through the gap between the two steel bars, forming arc process and electroslag process under the flux layer, generating arc heat and resistance heat, melting the steel bars and pressurizing them. Simply put, it is a fusion welding method that uses the resistance heat generated by current passing through liquid slag to weld. But compared with arc welding, it has high efficiency and low cost, and has achieved good results in the construction of some high-rise buildings in China. According to the shape of the electrode used, it can be divided into wire electrode electroslag welding, plate electrode electroslag welding and nozzle electroslag welding. Electroslag welding is suitable for welding thick plates. Widely used in boilers, heavy machinery and shipbuilding industries.

Question 3: Where are the longitudinal reinforcement connections of columns and walls for electroslag pressure welding?

Question 4: What certificate is needed to operate electroslag pressure welding? People's Republic of China (PRC) special operation certificate.

There are only three categories of welders.

1, general welding = manual covered electrode welding+gas welding+gas cutting.

2, argon arc welding

3. Double guarantee welding penetration

Review every two years.

Question 5: When electroslag pressure welding and binding lap are used for vertical reinforcement, which performance is better and which cost performance is higher? 5 points: It is suggested that 14 and below (including 14) adopt binding lap, and 14 and above adopt electroslag pressure welding. There is no problem with the performance of either of these two connection methods.

Question 6: When to use single-sided welding, when to use double-sided welding, when to use butt welding, when to use electroslag pressure welding and when to use hehe. You asked this question, which is difficult to answer. Actually, it's not difficult It seems that you are too studious.

1, lap binding, avoid hot work in the construction process, commonly used when the engineering level is not high (secondary project). Avoid welding operation, and the construction is fast. It should be noted that the specification generally requires lap joints below 20 or 22, which is also included in the general description of general drawings. It doesn't matter whether 20 is standard or 22, it depends on your own requirements for the construction team. Large diameter steel bars should avoid overlapping as much as possible. Designers have structural strength considerations, and overlapping binding of large-diameter steel bars is too wasteful.

Lapping and binding is the most primitive stage of engineering construction, but it is still not to be underestimated.

2. Ordinary arc welding: single-sided welding and double-sided welding. Pay attention to the welding length, the diameter of the first-grade steel bar is 8 times on one side and 4 times on both sides. The diameter of secondary reinforcement is 10 times on one side and 5 times on both sides. When welding, as long as you pay attention to slag inclusion, bubbles and meat biting, you should pay special attention to knocking off welding slag.

Selection: Single-sided welding is commonly used, accounting for more than 80% of the project. Many engineering parts are installed first and then welded, so there is no room for welding operation. Workers cannot be forced to weld on both sides, nor can they. Unfortunately, there are still some steel scrap missing, which has not been installed. Double-sided welding can be carried out first.

Pay attention to using covered electrode. J422 covered electrode can be used for 1 grade and grade 2 steel bars, and J502 or J506 covered electrode can be used for grade 3 steel bars. J506 is recommended for important parts.

3. Flash butt welding. When making semi-finished products, the method used when the reinforcement of beam span or pier exceeds the length of reinforcement. Take a girder with a span of15m or a span of 24m as an example. The height of the main reinforcement of the pier is13m or15m. You can also use it when you encounter scrap steel. To put it bluntly, there is little difference between flash butt welding and ordinary arc welding.

It should be noted that if you are the supervisor or technician of the construction unit, it is not recommended to use flash butt welding machine. Generally, this technology is not widely used. The migrant workers in several construction sites I have experienced, including China Railway, have not mastered it well and it is difficult to achieve satisfactory results. Why bother yourself. Then let the supervisor or quality supervision station make irresponsible remarks. Why bother about it?

4. Electroslag pressure welding. This is more commonly used. Must be used upright. You can't use water droplets on the beam.

Fire prevention in the construction site is troublesome, and several electroslag pressure welding machines work at the same time, which is also a test for the electricity consumption in the construction site. Generally, two or three questions are not big. This quality inspection is relatively high, and the requirements for workers are not too high. Quality is easy to guarantee.

5. I know that threaded sleeve connections can be divided into three categories: tapered threads, straight threads and upset threads. The difference between taper thread and straight thread is only on the machining blade. Upsetting straight thread is to upset the head of the steel bar to be turned before turning the thread to increase the stress of the steel bar.

It should be noted that there are three grades of steel bar straight thread sleeve joints: A, B and C, and the prices of sleeves are also different. Grade a is the best. Usually, the specification requirement of 35 times diameter and not less than 500mm can be ignored, which can not meet the requirement of 50% overlap. It is allowed to overlap any part, and each steel bar has a joint.

6. I have never seen gas pressure welding and casing connection. Sorry, I laughed.

7. You forgot to mention a kind of extrusion sleeve connection, which is forced by a special pressure machine. I saw it once. It's the sleeve of Liuzhou Ovem. This kind of construction is relatively fast and is mainly used for the construction of large-scale national infrastructure. It may be that upsetting threads or extrusion sleeves are not commonly used in small projects or real estate. Upsetting straight thread appeared in the Second Yangtze River Bridge in Chongqing (cable-stayed bridge with a main span of 460m), and extrusion sleeve appeared in Tianxingzhou Yangtze River Bridge in Wuhan. Real estate and migrant workers' projects mainly depend on cost. As long as it is a sleeve, it is more expensive, including straight thread and tapered thread sleeves.

The above is purely original. I have been typing for a long time. I hope I can help you.

Question 7: What is electroslag pressure welding? What is argon arc welding? Is the difference pole (positive or negative) between the workpiece and covered electrode power supply. The instantaneous contact between the covered electrode and the workpiece ionizes the air to generate an arc. The temperature of the arc is very high, about 5000-6000K, which melts the surface of the workpiece to form a molten pool. Covered electrode metal is melted and coated on the surface of the workpiece to form metallurgical bonding.

Question 8: What is the working principle of electroslag pressure welding? The method of welding by electric current through the resistance heat generated by liquid slag is called electroslag welding. The tinkling current melts the electrode and the base metal through the resistance heat generated by the slag.

Question 9: When should the straight thread sleeve be considered for steel bar joints and when should electroslag pressure welding be considered? One is the location where the steel bars are butted.

If it is a vertical rib. Electroslag pressure welding is more convenient and economical.

If it is in a horizontal position, it is more convenient to connect with a straight threaded sleeve. Forgive me, I have never seen electroslag pressure welding used for steel bar butt joint in horizontal position.

For the butt joint of steel bars in horizontal position, if the steel bars are long, one can be butt-jointed with flash in advance, so it is not difficult to install two fixed-length steel bars under the working face. This will be more economical.

What is mentioned above is the relationship between position and docking type.

The second is the diameter of the steel bar.

In some places, the size of size 25 and above requires straight thread, so you have no other choice, so follow its rules.

If there is no restriction in this respect, generally speaking, straight thread is used for 25 and above, which has better quality and reliability.

Of course, the quality of electroslag welding can also be guaranteed.

Let's focus on the economy. That's cheap. Let's take that one. The economy should be analyzed according to the market. The landlord may wish to analyze it himself.

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