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27
2021-09
Diagnosis of Stud Welding Difficult and Miscellaneous Disorders
Welding experts combined with 40 years of stud welding experience, put forward detailed solutions to some stud welding intractable diseases, and solve the stud welding production problem in your production! 1. For this welding position, due to gravity, the dissolved metal tends to flow to the lower side of the bolt during welding, resulting in uneven weld angle formation. The larger the bolt diameter, the greater the impact. Generally speaking, for this reason, vertical welding of bolts with a diameter of more than 10mm is not recommended. To obtain a satisfactory fillet forming basic requirements set the shortest welding time. A vertical weld will reduce the maximum size of the weld bolt for a given power source. must bear in mind
2021-09-27
27
2021-09
Welding crack is divided into its essence, can be divided into hot crack, reheat crack, cold crack, lamellar tear and so on. The following only on the causes of various cracks, characteristics and prevention methods for specific elaboration. 1. Hot crack is produced at high temperature during welding, so it is called hot crack, which is characterized by cracking along the original austenite grain boundary. According to the different materials of the welding metal (low alloy high strength steel, stainless steel, cast iron, aluminum alloy and some special metals, etc.), the form, temperature range and main reasons of the hot crack are also different. At present, the thermal crack is divided into three categories: crystallization crack, liquefaction crack and multilateral crack. 1) Crystal crack main
2021-09-27
27
2021-09
Coal Mine Gas and Coalbed Methane
Coal mine gas and coalbed methane coal mine gas has many hazards, the current management of coal mine gas is mainly through the extraction technology to control. In view of the general low permeability coal seam conditions in China, it is usually through the mining of protective layer, hydraulic fracturing, hydraulic cutting, hydraulic punching, controlled pre-splitting blasting, intensive drilling, gas phase fracturing and other technologies to increase permeability first, and then carry out coalbed methane extraction to control gas disasters. So what is the difference between the two concepts of coal mine gas and coalbed methane? Take a look at how the current standards define the two. 1. Coal mine gas (1) According to the National Energy Administration's "Eleventh Five-Year Plan for the Development and Utilization of Coalbed Methane (Coal Mine Gas)"
2021-09-27
27
2021-09
With the continuous strengthening of sand fracturing and acidizing fracturing technology and the increasing depth of oil and gas wells in China, fracturing pumps are developing in the direction of large displacement, high pressure and high power. With the development of oil and gas exploration technology, the distribution of oil and gas wells is becoming more and more extensive, and the requirements for the migration of fracturing equipment will be higher. Therefore, the working condition of the fracturing pump is even worse, in order to further improve the service life of the fracturing pump and carry out structural improvement and overall research on it is of great significance. 1. Domestic fracturing pump technology research status due to China's economy relative to those western developed countries still have a certain gap, generally still in imitation and
2021-09-27
27
2021-09
The new sharp tool of intelligent mine drilling is coming.
Huangling Mining No.1 Coal Mine: Intelligent Mine Drilling New Leg Comes
2021-09-27
27
2021-09
Short Board and Solution for Manufacturing Diamond Bit -- Yikuang Technology
In order to overcome the "short board" of diamond drill bit manufacturing hot press sintering, to play the strengths of cold press impregnation, and to use the advantages of microwave sintering, innovative technologies can be produced. Although cold press sintering drill and microwave heating technology are not new technologies, they have been developed for many years. However, the use of high pressure molding in cold press impregnation drill instead of low pressure sintering in hot press sintering can greatly improve the sintering pressure; the use of microwave sintering instead of the current use of intermediate frequency sintering can improve the shortcomings of hot press sintering. Combining these two technologies is an innovation that will play an important role in improving the performance of diamond drill bits and improving the economic indicators of drilling technology.
2021-09-27
27
2021-09
The industrial revolution has brought about earth-shaking changes in human life. The production of various machines makes us no longer rely on the forces of nature, but we also know that energy will not appear out of thin air, nor will it disappear in vain, but will transform its own form of expression. This is the law of conservation of energy. So the legendary "perpetual motion machine" does not exist, and our machinery also needs to consume energy to run. As a result, energy is becoming more and more important to human beings, and people even start wars in order to compete for energy. Today, our cities still rely on a variety of energy to run, people have been looking for the world's existence of energy, and now make
2021-09-27
27
2021-09
China Railway 25 engineering bureau strength ranking!
After decades of development, today's 25 engineering bureaus have already grown into strong enterprises in the construction of enterprises. However, the so-called strong is more powerful. Which of the 25 engineering bureaus is better is also a question that lingers in everyone's mind. Today we will find out. Objectively speaking, there are many factors to evaluate the strength of an enterprise, but this does not prevent us from analyzing it from a certain point. This paper intends to comprehensively evaluate these 25 engineering bureaus from the perspective of net profit, supplemented by factors such as the amount of newly signed contracts and operating income, and divide these 25 into four echelons, the specific ranking is as follows: the first echelon of China Railway Fourth Bureau
2021-09-27
22
2021-09
How to carry out daily maintenance of diamond drill bits
Diamond drill bit is suitable for coal mining, geological exploration work and various engineering drilling, but the problem of various technicians is how to carry out daily maintenance. For diamond compact drill bit, today we should explain how to carry out the daily maintenance of diamond drill bit according to the requirements of diamond drill bit users. The more valuable part of a diamond bit is the cutting teeth of its working face. Since the cutting teeth in diamond drill bits are polycrystalline diamond compacts, they are sintered by diamond at high temperature and high pressure, so the diamond compacts are hard but brittle. Therefore, the diamond composite bit is one of the expensive wearing parts in underground engineering and geological exploration. This is going
2021-09-22
22
2021-09
