Due to the harsh working conditions of oil wells, many downhole tools are subjected to long-term loads and used under conditions of corrosion and wear, resulting in premature failure and damage, thereby shortening their life. For example: journals, roulettes, sleeves, bearing bushes, oil drill collars, etc. of large rotors. However, these parts are often very expensive, involving many types of parts, complex shapes, and large differences in working conditions. Downtime for maintenance and replacement of components not only increases material costs, but also affects oilfield production, resulting in various losses. Most oil drilling and production industries use laser cladding technology to prepare and repair hard coatings in the wear area of large parts. It does not require preheating, and the subsequent processing volume is small, which shortens the repair cycle and improves the surface hardness and corrosion resistance of the workpiece. And wear resistance, greatly improve the service life of components.
• Ultra-high-speed laser cladding
It is used for the rapid preparation of wear-resistant coatings for axisymmetric parts such as journals, sleeve shafts, and discs of impellers and large rotors; due to low heat input and small deformation, it has unique advantages in surface cladding of thin-walled and small-sized parts.
• Inner wall laser cladding
It is used for the preparation of wear-resistant hard coatings, erosion-resistant or corrosion-resistant coatings on the inner wall surface of bearing sleeves, oil drill collars and other parts, rapid repair of local defects on the inner surface, and laser cladding repair in narrow and restricted locations.
• Conventional laser cladding repair
For the remanufacturing of damaged parts, or the manufacture of surface functional coatings for new parts. Such as laser cladding repair of screw wear-resistant belts, gates, and wear-resistant sleeves.
Laser Application Case
• Laser cladding of oil drill collar inner wall
In oil, natural gas and geological exploration drilling engineering, drill collars are oil drilling tools often used in drilling. The quality and service life of drill collars are critical to the economics of the oil industry. Therefore, the use of drill collars should ensure impact resistance, toughness, wear resistance and corrosion resistance. Since the sprayed layer made by the traditional spraying method is mechanically combined with the substrate, spalling often occurs when it is used in a high impact environment. The laser cladding equipment developed by Aachen United Technology can adapt to the depth of 3000mm and the inner diameter of 50mm. Possibly, successfully challenged the inner hole laser repairable depth. The matching high powder feeding precision cladding nozzle and endoscopic image monitoring system can complete the accurate repair of the damaged area in the deep hole, and achieve long-term and stable cladding processing inside the small diameter and deep hole drill collar, and prepare the surface Continuous smooth, defect-free repair coating after machining. At present, this technology has been successfully applied to the remanufactured products of oil drill collar repair, which greatly reduces the scrap rate of products and saves a lot of use costs for customers, which has become a major technical highlight in this field.
• Gate laser cladding
The preparation of surface coatings with both high wear resistance and corrosion resistance has always been a major technical difficulty in the field of laser cladding. Aachen United Technology Co., Ltd. precisely controls the powder composition ratio and the energy coordination control of the cladding process to uniformly precipitate a dispersed and distributed strengthening phase inside the coating structure, improve the wear resistance of the coating and reduce the stress level, so as to obtain no cracks and pores. Defect and strong acid corrosion resistant high-quality coating (coating thickness 0.3mm), has been successfully applied to the gate products of the flat gate valve. The actual 72h test proves that the life of the coating is more than doubled, there is no cracking and corrosion, and the average Vickers hardness of the coating is higher than 800HV0.2.
• Screw laser cladding
The screw rotates in the barrel, and the friction between the material and the two gradually wears the working surface of the screw and the barrel; the diameter of the screw gradually decreases, and the diameter of the inner hole of the barrel gradually increases. In this way, the matching diameter gap between the screw and the barrel gradually increases with the gradual wear of the two, resulting in a decrease in production. Laser cladding technology can effectively solve such wear problems. Remanufacturing and repairing the wear surface of the screw effectively prolongs the service life of the screw and reduces the use and maintenance costs.