Welding methods and processes Clean and prepare Repair the shaft hole out of round, the first to use carbon arc gouging resection support shelf worn shaft hole, and then use the angle grinder to balance the rack shaft hole polished clean, should be free from dirt, rust. Patching the site in need patching before fully preheated using a heating plate for preheating, the preheating temperature was 200 ° C, and then overall patching to, selection TM the-771S283319-K02, having a diameter of 1.6mm wire, CO2(CO2 Gas Shielded Welding Wire) as a protection welding gas welding two gimbals shaft holes. Due to the severe loss of round shaft hole, welding volume, so the repair welding process using layers of surfacing welding process, to ensure that no inclusions and other weld defects generated during the welding process, according to the different parts of the shaft hole to determine the extent of the loss of round surfacing layers to avoid excessive lead turning the surfacing thickness over large. Repair Welding Assembly process can not be interrupted, once, patching and the shaft hole round heating temperature to 300 ° C, asbestos cloth wrap to slow cooling to reduce repair welding surface hardness. Repair welding is completed, the next step is boring. Boring after welding As a benchmark, the use of portable boring machine, accompanied by homemade jig (circular steel plate hole in the middle, supporting the boring bar on the blind hole play to ensure that the inside and outside hole coaxial to the the two gimbals axis installation where blind hole the degree of action) to find positive, to guarantee hole concentricity of the inside and outside. Processing hole alignment, strengthening install the boring bar to install the boring head, boring, attention to the boring bar boring speed, feed rate of the boring tool, to eat knives depth, not because of the boring bar above point occurs flutter phenomenon, thereby to ensure that the quality and accuracy of the machined surface, and also makes the life of the boring device can be guaranteed. The last fine boring, eating plunging depth determined in the 0.2 ~ 0.4mm, as far as possible within the scope of the device allows to increase the rotational speed of the boring bar, in order to improve the quality of the inner surface of the machined hole meet the needs of the two balanced frame assembly. Gimbals installed after the repair of this method proved axis, with the hole properly, concentricity also reached the requirements to meet the work requirements of the equipment, take advantage of this program to deal with the five same hole Practice has proved that this scenario is simple, efficient and effective, greatly reduce the processing costs, but also improve the turnout of the equipment to ensure that the use of mining equipment, extend the life of the equipment, bring some economic benefits to mine.
Compared with other traditional welding techniques, laser welding has the following advantages:
1, the laser welding is a welding of the non-contact type, the operating process without pressure, welding speed, high efficiency, large depth, the residual stress and the deformation is small, can be welded at room temperature or under special conditions (such as a closed space), the welding The equipment is simple, does not produce X-ray apparatus.
2, welding refractory material, such as a high melting point metal, and even can be used for non-metallic materials such as ceramics, plexiglass and other welding of profiled Welding Material, to good effect, and has a great deal of flexibility, can be difficult to access for welding parts of the purposes of the non-contact remote welding.
3, the laser beam by focusing a small spot can be obtained precise positioning unaffected by magnetic fields and can, therefore, micro welding, suitable for the automated production of large quantities of micro, small workpiece assembly welding.
4, the laser beam is easy to realize spectroscopic beam by time and space, can switch means transmitting a laser beam held multiple workstations simultaneously processing of a multi-beam, and multi-bit processing, therefore, can be performed, provided the conditions for more precise welding.
5 is a non-contact processing, no tool wear and tool exchange and other issues, at the same time, without the use of electrodes, so there is no electrode contamination or damage concerns, and easy to automate high-speed welding, laser welding. Also can be digital or computer control. However, laser welding also there are some limitations:
First, the high cost of lasers and their associated systems, disposable equipment investment.
Secondly, during the welding process, the Welding Assembly of high precision, and the position of the beam on the workpiece not have a significant offset.
Further, the weld thickness than the electron beam welding small, welding some of the high reflectance of the metal is still relatively difficult.