A carbon steel core stainless steel electrode for high current welding

Abstract

The invention provides a carbon steel core stainless steel electrode for high-current welding. The electrode consists of a core wire and a cover, wherein the cover is prepared by the following raw materials in percentage by weight: 30-40% of rutile, 10-15% of marbles, 3-5% of fluorite, 1-2% of quartz, 5-10% of feldspar, 1-2% of mica, 3-5% of ferrotitanium, 2-4% of manganese metal, 20-30% of chromium metal, and 5-15% of nickel metal. In the prepared stainless steel electrode, the redness resistance and the welding process performance of the electrode are excellent; and the electrode with the diameter of phi 4.0 can be welded by current higher than 40% compared with a conventional stainless steel electrode, so that the welding efficiency is improved. When the high-current welding is performed, the tail of the electrode is difficult to become red, and the cover is not cracked; the use level of the electrode is saved; the melting speed of the electrode is uniform; the molding of a welding line is beautiful; the slag removing performance is excellent; and the process performance of the stainless steel electrode in the high-current welding is improved.

Description

technical field [0001] The invention relates to the field of welding materials, in particular to a carbon steel-cored stainless steel welding rod for high-current welding. Background technique [0002] Traditional stainless steel electrodes generally use stainless steel wire with a chemical composition similar to that of the deposited metal as the welding core, and the outside is coated with a coating. When this stainless steel electrode melts to 2 / 3 of the length of the entire electrode during welding, the electrode will The tail will be red, the coating will crack, and the melting speed will increase at the same time, the welding process will deteriorate, and the spatter will increase, resulting in deterioration of weld formation and difficulty in slag removal. This is because the resistivity of the chromium-nickel stainless steel welding core is 6 to 7 times larger than that of carbon steel welding core, and the thermal conductivity is only 1 / 3 of that of carbon steel, an...

AI Technical Summary

Problems solved by technology

[0002] Traditional stainless steel electrodes generally use stainless steel wire with a chemical composition similar to that of the deposited metal as the welding core, and the outside is coated with a coating. When this stainless steel electrode melts to 2 / 3 of the length of the entire electrode during welding, the electrode will The tail will be red, the coating will crack, and the melting speed will increase at the same time, the welding process will deteriorate, and the spatter will increase, resulting in deterioration of weld formation and difficulty in slag removal

This is because the resistivity of the chromium-nickel stainless steel welding core is 6 to 7 times larger than that of carbon steel welding core, and the thermal conductivity is only 1 / 3 of that of carbon steel, and the linear expansion coefficient is large. During the welding process, strong resistance heat As a result, the end of the electrode melts during welding. Under the action of high resistance heat and low thermal conductivity, the temperature of the welding core rises sharply, causing the electrode coating to be overheated, and due to the large linear expansion coefficient of the stainless steel welding core, welding When the electrode coating is easy to crack, the welding process performance of the electrode is seriously deteriorated, and the remaining 1 / 3 electrode is basically unusable, which is a great waste. When the welding current gradually increases, the electrode coating cracks and the welding process performance deteriorates. It is more serious. Therefore, in order to ensure the welding process performance of the electrode, the traditional stainless steel electrode should be welded with a small welding current as much as possible, and cannot be welded with a large current. The electrode with a diameter of Ф4.0 generally uses a welding current of 100-160A for welding.