1. China Nut's welding technology process: work preparation → joint assembly → installation of temporary bolts → installation of high-strength bolts → tightening of high-strength bolts → inspection and inspection.
2. Preparation for welding of finish-rolled nuts: prepare wrenches, temporary bolts, overshoots, wire brushes, etc. The first thing to do is to check the construction torque, that is, to check the torque wrench used, it is necessary to check before the class, and only after the torque is checked Quasi-use. The torque calibration corresponds to a designated person. The length of the hexagonal finish-rolled nut is selected, considering that the steel used in the processing of steel components is usually normal service. Sometimes the material substitutes are mostly large instead of small, and thick instead of thin. Therefore, the total thickness of the connection is increased by 3 to 4 mm. Many, therefore, the length of high-strength bolts and nuts should be selected, usually 2 to 3 buckles should be grown after tightening, and then a set of spare parts should be equipped according to the request.
3. Assembling of Bolt Factory's finishing-rolled nuts: sort out the conflicting surface. If the plate is not flat, it should be assembled after the flatness meets the requirements. There should be no paint or sludge on the conflict surface, and there should be no burrs around the hole. The conflict surface should be cleaned with a wire brush, and the brush direction should be perpendicular to the direction of the conflict force. When in doubt about the installation hole, do not use oxygen-acetylene to ream the hole. Use a reaming drill to ream the hole. After reaming, rearrange the burrs around the hole.

       How can I purchase high-quality China Nut?

　　 1. Measure the outer diameter, the defective product is thin and short, obviously thinner than the national standard screw. Even more surprising is that the defective product does not even have a tension spring washer on the screw. Tension spring washers are mainly used for compression. The expansion screw of the tension spring washer is not easy to fix firmly.
　　
　　2. From the outside, the micro screw manufacturer introduced that the original screw has been treated with appearance, high gloss, and lubricated without sand holes. However, defective screws have rough processing, shallow threads, burrs, different screw angle widths, too shallow thread grooves, and uneven threads. If such a defective screw is used in furniture, it is very simple to slide or even break, which is basically a "disposable product".
　　
　　3. Check the certificate of origin of Bolt Factory's products. Since there are supporting manufacturers of export products, the requirements for production and quality are stricter, and the quality is guaranteed.

China Nut is mainly used in steel structure engineering. It is used to connect the connection points of steel structure steel plates. Iron will rust, but steel structure bolts are not easy to rust. However, it is difficult to avoid rust in some special environments. This problem, for example, after being corroded by natural weather in a long-term humid environment at the seaside, it may cause rust problems. If this problem can be solved, it is only necessary to replace it. If steel structural bolts are exposed to rain or some kind of liquid, they will cause rust. Corrosion such as bird droppings in places with abundant seawater in the wild is the cause of rusting of steel structural bolts. In order to solve this problem, we must take corresponding actions and take moisture-proof measures for the steel structure bolts.

　　There is still a way to prevent moisture. Solvent-free paint can be used. Here, dipping paint without oxidizing components, such as epoxy urethane or undenatured epoxy-based dipping paint.

The use of these paints by Bolt Factory can effectively protect the anchor bolts of the steel structure. It has a good isolation and reuse for isolating water vapor in the air. The main steel structure bolts do not oxidize and rust, and the hardness performance of the steel can be guaranteed. No loss, so as to ensure the fastness of the anchor bolts and the safety of the corresponding equipment.

Do you know what processes are available for metal heat treatment? Today Bolt Factory-Zhejiang Weigao will explain the three major processes of metal heat treatment.
Metal heat treatment processes can be roughly divided into three categories: overall heat treatment, surface heat treatment and chemical heat treatment. According to the different heating medium, heating temperature and cooling method, each category can be divided into several different heat treatment processes. The same metal uses different heat treatment processes to obtain different structures and thus have different properties. Steel is the most widely used metal in industry, and the microstructure of steel is also the most complicated, so there are many types of steel heat treatment processes.

Overall heat treatment
It is a metal heat treatment process that heats the workpiece as a whole and then cools it at an appropriate speed to change its overall mechanical properties. The overall heat treatment of steel has four basic processes: annealing, normalizing, quenching and tempering. Annealing, normalizing, quenching, and tempering are the "four fires" in the overall heat treatment. Quenching and tempering are closely related, and they are often used in conjunction with one another.
Annealing is to heat the workpiece to an appropriate temperature, use different holding times according to the material and workpiece size, and then slowly cool it, the purpose is to make the internal structure of the metal reach or close to the equilibrium state, obtain good process performance and use performance, or for further quenching Prepare for organization.
Normalizing is to heat the workpiece to a suitable temperature and then cool it in the air. The effect of normalizing is similar to annealing, except that the resulting structure is finer. It is often used to improve the cutting performance of low-carbon materials, and sometimes it is used for some low-carbon materials As the final heat treatment.
Quenching is the rapid cooling of the workpiece in quenching medium such as water, oil or other inorganic salts, organic aqueous solutions after heating and holding the workpiece. After quenching, the steel becomes hard, but at the same time it becomes brittle.
Tempering: In order to reduce the brittleness of steel parts, the quenched steel parts are kept for a long time at an appropriate temperature higher than room temperature but lower than 650℃, and then cooled.
The "Four Fires" have evolved different heat treatment processes with different heating temperatures and cooling methods. In order to obtain a certain strength and toughness, the process of combining quenching and high temperature tempering is called quenching and tempering. After some alloys are quenched to form a supersaturated solid solution, they are kept at room temperature or a slightly higher temperature for a longer period of time to improve the hardness, strength, or electrical magnetic properties of the alloy. Such a heat treatment process is called aging treatment.
The method of effectively and closely combining pressure processing deformation and heat treatment to obtain a good strength and toughness of the workpiece is called thermomechanical treatment; heat treatment performed in a negative pressure atmosphere or in a vacuum is called vacuum heat treatment, which can not only make The workpiece is not oxidized or decarburized. It keeps the surface of the workpiece smooth and clean after treatment, improves the performance of the workpiece, and can also pass through the infiltration agent for chemical heat treatment.
Surface heat treatment
A metal heat treatment process that only heats the surface of the workpiece to change the mechanical properties of the surface. In order to heat only the surface of the workpiece without causing excessive heat to be transferred into the interior of the workpiece, the heat source used must have a high energy density, that is, to give a larger heat energy to the workpiece per unit area, so that the surface or part of the workpiece can be short-term or instantaneous Reach high temperatures. The main methods of surface heat treatment include flame quenching and induction heating heat treatment. Commonly used heat sources include flames such as oxygen acetylene or oxypropane, induction current, laser, and electron beam.
Chemical heat treatment
Metal heat treatment process by changing the chemical composition, organization and performance of the workpiece surface. The difference between chemical heat treatment and surface heat treatment is that the latter changes the chemical composition of the surface of the workpiece. Chemical heat treatment is to heat the workpiece in a medium (gas, liquid, solid) containing carbon, nitrogen or other alloying elements for a long time, so that the surface of the workpiece is infiltrated with elements such as carbon, nitrogen, boron and chromium. After infiltration of elements, other heat treatment processes such as quenching and tempering are sometimes required. The main methods of chemical heat treatment are carburizing, nitriding and metalizing.
Conclusion
Heat treatment is one of the important processes in the manufacturing process of China Nut and molds. It can control various properties of the workpiece, such as wear resistance, corrosion resistance, and magnetic properties. It can also improve the structure and stress state of the blank to facilitate various cold and hot processing. For example, white cast iron can obtain malleable cast iron after long time annealing treatment, which can improve plasticity; gears adopt correct heat treatment process, and the service life can be doubled or dozens of times longer than gears without heat treatment; in addition, cheap carbon steel can be penetrated Certain alloying elements have certain properties of expensive alloy steels, which can replace certain heat-resistant steels and stainless steels; almost all tools and molds require heat treatment before they can be used.

I believe you have a certain understanding of fasteners, but you may not know so much about the threads of fasteners. The following is the use and classification of fastener threads. Let’s take a look with China Stud Supplier.

       Threads are used in a wide range of applications, from airplanes and automobiles to water pipes and gas used in our daily lives. Most threads play a role in fastening connections, followed by the transmission of force and motion. There are also some special-purpose threads. Although there are many types, the number is limited. The durability of the thread is due to its simple structure, reliable performance, convenient disassembly, and ease of manufacture, making it an indispensable structural element in various electromechanical products today. According to the purpose of the thread, all kinds of threaded parts should have the following two basic functions: one is good screwability; the other is sufficient strength.
       The threads of Industrial Bolt Factory can be divided into: metric thread (metric thread), inch thread, American thread, etc. according to the region (country). We are used to refer to the inch thread and the American thread collectively as the inch thread, and its profile angle is 60°, 55°, etc., the related thread parameters such as diameter and pitch adopt inch size (inch). In our country, the tooth profile angle is unified to 60°, and the diameter and pitch series in millimeters (mm) are used to name this type of thread: ordinary thread. The above is the basic knowledge of fastener threads introduced by the editor today, I hope it will be helpful to everyone. Our company will serve you wholeheartedly, waiting for your call or visit at any time.

What are the characteristics of the appearance of roof bolts?  Next, Zhejiang Weigao Bolt Factory will introduce you in detail:
1. According to the stress mode of connection, there are common bolts and bolts for reaming holes. Bolts for reaming holes shall be matched with the size of holes and used when subjected to transverse force.
2, according to the shape of the head has a hexagonal head, round head, square head, countersunk head, etc. Generally countersunk head is used in the place where smooth surface is not protruding after connection, because the countersunk head can be screwed into the parts.

In addition, in order to meet the need of locking after installation, there are holes in the head and in the rod, which can prevent the bolts from loosening when subjected to vibration.
Some China Nut need to be made into thin smooth rods without threads, which are called thin waist bolts. These bolts are beneficial to the connection under variable forces.
There are special high-strength bolts on the steel structure. The head will be bigger. The size will also change.

In addition, there are special uses: T-groove bolts are used most frequently on machine tools and jigs, with special shapes. Both sides of the head must be cut off. Anchor bolts are used for connecting and fixing machines and the ground, and there are many shapes. U-shaped bolts, as mentioned above. etc.

There is also a special stud for welding, one end of which is threaded and the other end is not, which can be welded to the part while the other end is directly screwed with the nut.