Self-protective and high-toughness flux-cord welding wire

Abstract

The invention is concerned with the welding material field, especially high tenacity self-protect flux cored wire for the all-position welding, uses to weld the oil and gas pipe-line, the bridge, the tall building, the platform. The compositions of the flux are: fluoride is 50% to 60%; oxide is 20% to 25%; carbonate is 1% to 5%; magnesia chrome is 12% to 18%; silicomangan or ferro manganese is 4% to 6%; nickel is 1% to 1.5%. Comparing with the existing technology, the invention is not only with better mechanical property, but also lower cost of the soldering wire.

Description

technical field [0001] The invention belongs to the field of welding materials, in particular to a high-toughness self-shielding flux-cored welding wire for all-position welding, which is mainly used for welding oil and gas pipelines, bridges, high-rise buildings, offshore platforms and other fields. Background technique [0002] In the prior art, self-shielded flux-cored wire is a welding material that does not require shielding gas. It has the advantages of strong ability to resist wind interference, high deposition efficiency, excellent rust resistance and easy welding, and is especially suitable for field use. It is the main welding material for pipeline steel welding where the operation and auxiliary equipment and gas are not easy to transport. In addition to being used for pipeline steel welding, this self-shielding flux-cored wire can also be used in bridges, high-rise buildings, offshore platforms and other fields. [0003] At present, under the general environment ...

AI Technical Summary

Problems solved by technology

[0005] In U.S. Patent U.S.4186293, it is proposed not to use a large amount of fluoride, but to use a large amount of basic oxide, so as to obtain a self-shielding flux-cored wire with good penetration and low smoke, and the highest impact of the deposited metal at -29 ° C The toughness is about 50J, and its disadvantage is still low impact toughness

[0006] Chinese published patents CN 1152490A and CN 1117903A propose a self-shielding flux-cored welding wire with fluorite as the main fluoride, which does not emphasize the all-position welding adaptability of the welding wire, and the impact toughness of the deposited metal is also low

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