Cast Iron Welding – Useful Knowledge For Welders

Cast iron is known as an engineering material that can be applied in various industries, one of which is automotive. Cast iron is used as the main material of automobile engines, vehicle parts, gearboxes, pipes, etc. The advantages of this engineering metal are excellent fluidity, low melting point, wear resistance, and can be used in various machine designs. However, cast iron is actually brittle and not everyone can weld it. So, can you weld cast iron? If you are interested in welding cast iron, then you should read my article. I will share information about this manipulation metal.

Most people probably know about cast iron. But they don’t know why it’s called cast iron. Simply put, cast iron is made by melting and combining it with other metals and placing it in a mold. The molten iron will harden according to the desired mold shape. There are several types of cast iron; they are malleable cast iron, nodular cast iron, white cast iron and gray cast iron. They have their own nature and character. For example, gray cast iron. This cast iron is the most widely used due to the presence of carbon in the form of graphite flakes and is easy to work with. It also has high compressive strength and is responsive to welding.

If cast iron has many uses, then it should be easy to weld. Unfortunately, all cast iron is difficult to weld. Although the composition of cast iron is similar to that of steel, namely carbon and iron, it is still very difficult to weld. Cast iron welding can be a nightmare for all welders. For example welding on gray cast iron; welding this metal often causes cracks. It is caused by the content of graphite. This graphite composition makes gray cast iron very sensitive to cracks when exposed to support or tensile loads. These conditions make gray cast iron very difficult to weld and solidify quickly.

The fast cooling process accompanied by shrinkage causes cracks on the left or right side of the weld. To anticipate the difficulties caused by rapid cooling, the welder must apply a relatively higher prehead to slow freezing. Welders must apply the SMAW (shielded metal-arc welding) process using a filler metal with a high silicon content, with flux, soda ash, borate, a small amount of ammonium sulfate and oxidizing iron. In addition, special wire is required in the cast iron welding process. This wire can be used for joining cast iron with stainless, iron, steel and copper. Up to this point, can you weld cast iron properly? Not everyone is able to perform welding on cast iron work-pieces. If you can do it well, then you are an extraordinary welder.