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.