Many factors affect the quality of castings, the first is the casting of the design process. When the design, in addition to determining the casting geometry, size according to the working conditions and material properties of the metal, but also from the point of view must be cast alloys and casting characteristics to consider the design is reasonable, that is a significant size effect and solidification shrinkage stress and other issues dock bollards to prevent or reduce the casting of segregation, deformation, cracks and other defects generated. The second to have a reasonable casting process. Casting structure that is based on the weight and size of the ports bollard, cast alloy and production conditions, select the appropriate sub-surface and shape, making the core method, a reasonable set of cast bars, cold iron, riser and pouring system. In order to ensure access to quality castings. The third is the casting quality of raw materials. Quality metal charge, refractories, fuel, flux, modifier and foundry sand, sand binder, paint and other materials, sub-standard, will make casting porosity, pinholes, slag, sticky sand and other defects, affecting the appearance quality of castings and internal quality, casting serious cause scrapped. The fourth is the process operation, to develop a reasonable process rules to enhance the skills of the workers, so that technical rules properly implemented. Due to various factors, often appear pores, pinholes, slag, cracks, dents and other defects. Repair equipment commonly used for welding machines, resistance welding machines, welding and other cold. For the quality and appearance of the less demanding casting defects can use welding machines and other heat, fast welder to repair. But in the field of precision casting defect repair dock bollard price, due to the large impact of argon welding heat will cause distortion when repairing castings, hardness decreased, trachoma, partial annealing, cracks, pinholes, abrasion, scratches, undercut, or combined with secondary defect is not enough and the internal stress injury. Cold welding just overcome the above drawbacks, its advantages mainly in small heat-affected zone, casting without preheating, room temperature cold welding repair, thus no distortion, undercut and residual stress, no local annealing, does not change the casting metal organizational status. Thus cold welding surface defect fixes for precision castings. Range for welding cold welding welding Φ1.5-Φ1.2mm repeated melting point accumulation process, in a large area of ??defect repair process, the repair efficiency is the only factor in its widespread application constraints. For large defects, recommend traditional welding process and casting defect repairing machine composite applications. Sometimes we may not have a lot of flaws dock bollard supply, it is not necessary to invest more in costs, we can use some Putty good repair, convenient and simple, such as ferrous materials, we can use (Jin Su into) JS902 repair click on it, could ever again be able to put the future, so you can save costs for our manufacturers, ah, let's cast the manufacturers to put more money into improving the quality of the product itself, allowing users to create more more wealth. Qingdao dock bollard | pier bollard | Chen Hua Chen machinery provided by the China Machinery Equipment Co., Ltd. Qingdao. Qingdao Hua Chen Machinery Co., Ltd. (www.qdchenhua.com) strong, credible, in Qingdao, Shandong CNC machine tool industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Chen Hua machinery and you hand into the brilliant, for a better future!