Classification of cast iron welding

Cast iron is commonly known as pig iron. The selection of welding rods for pig iron welding depends on the characteristics of pig iron welding, as cast iron is a high carbon content iron-carbon alloy with a carbon content of 2% as a defining standard. The types of cast iron are divided into many types, such as conventional gray cast iron, ductile iron, malleable iron, etc.

The Reality of Cast Iron Welding

In general, most of the equipment or components welded on the site for welding cast iron are not recognized by the site. Therefore, the unprofessional welding method is to weld this welding rod and that welding rod. At the beginning, there may be a micro crack or even a small casting defect pore, which can cause a crack to be welded on the welded part, until the crack extends and finally forks, In the end, the welding becomes uncontrollable until the cast iron is scrapped. Of course, the value of cast iron is generally not significant for small or replaceable parts, but it is not easy to replace many cast iron equipment. Moreover, many casting factories that produce equipment are overseas or discontinued. It is difficult to say if such unprofessional welding disrupts a production line.

Selection of Welding Rods for Conventional and Special Welding of Cast Iron

Usually, when welding cast iron, different cast iron welding rods are selected based on different cast iron types. Let's give a brief description and you can see that cast iron welding is far from as simple as many people or even professional welders imagine. The selection of light materials can make you feel dizzy. For example, the hot welding process of gray cast iron usually uses domestic J506 welding rods, and if the hot welding requires mechanical processing, Z308 is used, If it is hot welding, it can be processed with low strength requirements and 508 can be used. If it is high strength requirements and cannot be machined with Z408, it is not picky about cast iron material, has high success rate requirements, high crack resistance requirements, and can be cold welded with WELDING777.

Supplementary selection of cast iron welding rods

Cast iron welding usually involves three parts of materials and seven parts of technology and process. However, for the welding and maintenance of important cast iron equipment, it is necessary to choose the WEELDING777 cast iron welding rod with high crack resistance and wide applicability. After that, it is divided into seven parts of materials and three parts of process, reducing the requirements for technology and process. Nevertheless, we still need to attach great importance to the welding process, and even the best welding rod can cause problems if it is randomly welded.

Summary: For household use, you can prepare some J506 carbon steel welding rods and ordinary Z308Z208 welding rods. For professional special welding stores or manufacturing factories, especially repair factories, you can prepare some WEELDING777 special cast iron welding rods.