How to weld iron castings? Which welding method is adopted? What kind of electrode?
Because of some advantages of cast iron, it occupies a large proportion in automobile manufacturing materials. Most of the cast iron parts are the basic parts with high machining accuracy and high price, such as air cylinder block, cylinder head, transmission housing, etc..
In the manufacture and use of cast iron parts, cracks, porosity and damage often occur. According to statistics, in normal circumstances, reaching the wear limit of this kind of parts, change its size is only 0.08% ~ 0.40%, quality loss is only 0.1% ~ 1.8%, the scrap parts, is undoubtedly very wasteful. Therefore, it is necessary to study and make use of the advanced repair experience to repair the cast iron parts reasonably. Welding is a very effective way to repair cast iron parts.
Cast iron contains high carbon content, many impurities, and has low plasticity, poor weldability, sensitive to cooling speed and so on. After welding, white cast and cracks are easy to occur. In order to improve the welding quality of cast iron parts, the following methods can be adopted.
