Completed the validation and delivery of laser cladding process for oil drill pipe products.
Time：
2022-10-13
来源：
In the past, we used arc welding to deal with the wear resistance of the brazing sleeve, but this process in the welding process, there are often cracks, pores, spatter, bad shaping and other problems, which seriously affects the quality of the wear-resistant belt of the workpiece and the welding effect. After in-depth contact with the Hui Rui technical team, understanding that the Hui Rui in high-strength workpiece high wear resistance, high impact toughness and other aspects of a more perfect process system, and in the petrochemical industry has a wealth of cladding practice cases, decided to sign a contract with the Hui Rui co-operation. After repairing the brazing sleeve by laser cladding, the service life has been increased by 5 to 8 times, and the construction space and time have been saved, which greatly saves the cost.
>>Project Background
As an important part of oil exploration and drilling, the working environment of drill pipe ferrules is extremely harsh, and its high wear-resistant, high-impact and corrosion-resistant properties must be ensured. The use of laser cladding process can form a strong and durable protective film on the surface of the drill pipe ferrule, effectively preventing the external gasoline, oil fumes and other factors from infringing on the ferrule, thus improving the service life of the ferrule. In addition, it can also increase its surface roughness, maintain surface smoothness and improve surface wear resistance.
>>Technical requirements
1, the workpiece should achieve high wear resistance, high strength and corrosion resistance.
2, the surface of the workpiece should be relatively flat, and then directly on the surface of the workpiece to do the spray paint treatment without the need for machine levelling.
3, brazing sleeve sides and threads can not have powder sticking to the surface, the workpiece screw teeth can not be bumped.
>>Laser cladding process advantages
Laser cladding technology is the use of high power density laser beam rapid heating and melting of the metal substrate and metal powder sent to the surface of the substrate, giving full play to the characteristics of the laser beam heating and cooling speed is very fast, in the substrate material surface continuously spread to form a layer of high bonding strength, low dilution rate, grain refinement, composition of the alloy coating uniformity, and to improve the performance of the substrate material resistance to corrosion, abrasion and high-temperature oxidation and so on. Compared with the traditional process, taking the laser cladding method to repair the surface of the oil drilling rod braze sleeve has a number of advantages: first, it can achieve high strength, high precision and high wear resistance surface treatment, and has the benefits of corrosion resistance and high temperature resistance, effectively improving the service life and performance of the oil drilling rod braze sleeve; second, the laser cladding process is more green than the traditional process. Thirdly, it can achieve safe and efficient production and processing.
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Classification of commonly used crushing and grinding machinery
According to the mode of action of crushing force can be roughly divided into two main categories of crushing machinery: (1) crushers; (2) mills. Crushers generally deal with larger pieces of material, product size is coarse, usually more than 8 mm. Its structure is characterised by a certain gap between the crushing parts, not in contact with each other. Crusher can be divided into coarse crusher, medium crusher and fine crusher. Generally speaking, the materials handled by the mill are finer, and the product size is fine, up to 0.074 mm, or even finer. Its structure is characterised by crushing parts (or media) in contact with each other, the media used are steel balls, steel rods, gravel or ore blocks. But some machinery is both crushing and grinding, such as $ 5.5 mx 1.8 m grinding mill to deal with the upper limit of the ore size up to 350 ~ 400 mm, the product fineness up to -200 mesh accounted for about 40%. According to the crushing method, mechanical construction features (principle of action) to divide, roughly divided into six categories. (1) Jaw crusher (slot). The crushing action is to rely on the movable jaw plate periodically pressed to the fixed plate, will be sandwiched between the ore crushed. (2) Cone crusher. The ore pieces are between the inner and outer cones, the outer cone is fixed, and the inner cone makes eccentric class action, which crushes or breaks the ore pieces clamped in it. (3) Roll crusher. Ore block in the two opposing rotating rolls in the crevice, mainly by the continuous crushing effect, but also with the abrasive stripping effect, toothed roll surface and splitting effect. (4) Impact crusher. The ore block is crushed by the impact of the fast rotating moving parts. Belong to this category can be divided into: hammer crusher; cage crusher; impact crusher. (5) Mills. The ore is crushed by the impact and grinding action of the grinding media (steel balls, steel rods, gravel or ore pieces) in the rotating cylinder. (6) Other types of crushing and grinding: 1) Roller mill. Borrowing rolling sticks to crush the material. 2) Disc mill. Using the vertical axis or horizontal axis of the disc rotation as a crushing component. 3) Centrifugal mill. Use the centrifugal force generated by the high-speed rotating parts and media to complete the crushing effect.4) Vibrating mill. The use of rotating shaft to produce high-frequency vibration, so that the media and the material to complete the crushing effect of mutual impact. Various types of crushers have different specifications, different scope of use. At present, the coarse crushing in the processing plant mostly uses jaw crusher or gyratory crusher; medium crushing adopts standard cone crusher; fine crushing adopts short head cone crusher.
What are the advantages of laser cladding over other cladding technologies?
Following the development of mechanised industry, and other cladding skills (such as spraying tungsten carbide, tungsten carbide spraying plasma spraying or arc welding) compared to laser cladding is a unique process, the use of which there are fundamental differences. With laser cladding, a highly concentrated heat source has a significant impact on the product. Because of its low heat input, high cure rate and accurate process control, laser cladding has many advantages.
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