A Complete Guide For Welding Cast Iron
To weld cast iron can be difficult but it is no way an impossible task to be done. In most of the cases it has been found that welding cast iron requires different types of repairs on casting products. It does not refer to joining of different other components.
It is well known that there can be found some types of cast iron. However, one of the most commonly used ones is known as gray cast iron. In our complete guide about welding cast iron we will be discussing the procedure suited to this form of cast iron.
At the beginning we will be discussing about some facts about the gray cast iron which will help you understanding the challenges offered by the welding thing.
- Low Plastic Deformation Ability
- Cast Iron is very sensitive with heat, so it is easy to change the organization during welding and cooling process after welding
- Diverse of chemical composition
You should know the fact that there is approximately 2-4 percentage of carbon in the cast iron (Percentage of carbon in Steel 0~2.00%). This carbon amount make cast iron harder 10 times more found in the most of the steels. Actually weld point of cast iron is not strong
Select Best Electrode For Cast Iron Welding
If the cast iron is needed to be machined when the welding is done, at that time a special kind of electrode (nickel type) is required. So, you have to very careful while choosing the right kind of electrode otherwise the whole procedure of welding cannot be finished perfectly. As you can find lots of different electrodes in the market, so you should do your homework very well in this regard.
Heating or, not Heating
Generally, it can be said that welding for cast iron should stated with the preheating thing. However, the other successful way is to go for cooling the cast iron down. And step by step symmetric welding 2-3 cm brief segments
Welding Procedure With Preheating
If you go with the preheating at the beginning, then it will slow down the rate of cooling of the casting. If possible, it is recommended to heat the whole area of the casting. The typical preheating temperature is about 500 to 1200 degrees F. but, never ever go over 1400 degrees F otherwise you may face lots of difficulties during the welding.
Welding Procedure Without Preheating
There are certain things which sometimes create the situation where the welding technique does not require any kind of preheating, for example, the size of cast iron or casting, along with some other vital factors. In this case, the whole portion of the iron is needed to be cooling down but, not kept to be cold.
The above discussion can be referred to be the complete guide for welding cast iron. If you have read the whole procedure attentively, then you will not face any kind of problem while performing the job of welding on cast iron.
Mindful Manufacture Cast Iron
When the castings are being performed, melted irons are poured in a mold. Then, it is kept for a certain period of time in the mold so that it can get enough time to cool down very slowly. And, during the time of this cooling down procedure of cast iron, it can be allowed for the castings to be performed. In this case, you have to remember one very essential and important thing which is that the cooling down thing of the casting must be down very slowly otherwise the casting will not be done perfectly.