In our life, we often have to deal with the use of various products made of cast iron, which in its structure is a rather brittle alloy, but with good thermal conductivity. In accordance with this, the question often arises, how to cook it, because cast iron, due to its high content of carbon, sulfur and phosphorus, belongs to the group of poorly welded metals?
Instructions
Step 1
Having omitted the subtleties of the chemical composition of cast iron, chemical and other processes occurring during welding, let's still figure it out: how to weld cast iron? The industry of our country produces gray and white cast iron, which differ greatly in their composition and characteristics. Accordingly, the welding methods are different for them. Here it must be remembered that it is practically impossible to weld cast iron products that have been exposed to high temperatures from 300 degrees and above for a long time, as well as products that have worked for a long time in direct contact with various oils.
Step 2
The most acceptable way of welding cast iron in our household is welding using an electric welding machine. So, when electric welding, make a V-shaped groove of the edges to be welded and thoroughly clean them from oil, rust and dirt with a brush.
Step 3
Purchase electrodes with UONI-13/45 coating (welding with these electrodes is carried out with direct current of reverse polarity).
Step 4
Apply the weld seam in separate sections (broken down), this will help you avoid uneven heating of the part (separately directed sections of the weld seam should be no more than 10 cm). When welding products with a thickness of more than 5 mm, do not forget to reinforce the seam by a length equal to the thickness of the part to be welded.
Step 5
During welding, do not forget to allow the separately welded sections to cool down to 60-80 degrees. When welding cast iron using studs, do the following: using a drill (staggered), drill holes in the prepared edges (not through!), Cut a thread and screw into them low carbon steel studs (the angle of the edges of the parts to be welded should be 90 degrees).
Step 6
Insert the studs of a larger diameter into the groove. Weld with electrodes with a protective alloying coating of the E42 (42A) or E50 (50A) brand at direct or alternating current, while the electrode thickness is selected depending on the thickness of the workpiece to be welded.
Perform the welding itself by welding the studs with an annular seam and only after that fill the space between the welded studs and the groove with short sections. There are other methods of welding cast iron, but we will talk about them later.
