Castlion electrode with low-carbon steel core wire

Abstract

The present invention relates to a cast iron electrode with low-carbon steel core wire, and is characterized by that the extrior of the low-carbon steel core wire is covered with a layer of coating which is composed of 30-34% of reduced iron powder, 13-21% of marble flour, 13-17% of ilmenite, 4-8% of ocher powder, 2-8% of clay, 1-4% of potassium ferrocyanide and other 12 kinds of raw materials. Said electrode can meet requirements for welding several cast iron mother materials.

Description

technical field [0001] The invention belongs to the technical fields of welding rods, electrodes, materials and media for brazing, welding or cutting, and specifically relates to welding rods characterized by the composition and properties of materials. Background technique [0002] Iron castings are prone to various casting defects, high scrap rate, poor welding process performance, poor plasticity, and easy to form cracks under thermal stress and structural stress. When the cast iron is heated, if the cooling rate is slightly higher, cementite will be produced. The so-called white mouth, the hardness of the white mouth area is as high as HB800, equivalent to more than 5 times the hardness of cast iron, the white mouth area is not only hard but also brittle, resulting in cracks after welding. The content of sulfur and phosphorus in the chemical composition of cast iron is as high as 0.2%, which is 5 times that of ordinary low carbon steel. During welding, the sulfur and ph...

AI Technical Summary

Problems solved by technology

This kind of electrode has the advantages of low unit cost and easy manufacture, but the metallographic structure and hardness of the weld after welding are not complete after normalizing, and the hardness after annealing cannot be compared with cast iron QT60-2, QT50-5, QT42-10 respectively. Matching, welded joints cannot meet the requirements of cast iron QT70-2