Stainless steel braid welding material and manufacturing method thereof

Abstract

The invention discloses a stainless steel braid welding material and a manufacturing method thereof, and relates to the technical field of welding. The stainless steel braid welding material comprises a core wire and multiple strands of steel wire bundles. The whole core wire is in a round strip shape. The steel wire bundles wrap the outer surface of the core wire in the axis direction and are stranded and formed along the circumference of the core wire. Each strand of steel wire bundles is formed by stranding multiple thin wires. According to the stainless steel braid welding material and the manufacturing method, the stainless steel braid welding material which is adopted is high in melting speed, does not need large welding current, lowers the electrical energy consumption and is low in heat input amount, small in adverse effect on base metal thermal effect areas, small in welding deformation amount, good in stability during wire feeding, high in welding efficiency, good in quality and attractive in molding.

Description

Technical field [0001] The present invention relates to the field of welding technology, and in particular to stainless steel braid welding materials and manufacturing methods thereof. Background technique [0002] Stainless steel welding has the characteristics of high welding efficiency, but the existing welding materials are all single thick wires. This single thick wire requires larger welding parameters to achieve welding, and large welding parameters will inevitably lead to welding heat input. Large, resulting in large welding deformation. Another disadvantage of excessive heat input is that the width of the heat-affected zone is too large. Excessive width of the heat-affected zone will cause stress corrosion or intergranular corrosion failure of the welded joint under the action of welding stress and corrosive media, thereby reducing the equipment service life. [0003] In addition, the physical characteristics of stainless steel are low thermal conductivity and lar...

AI Technical Summary

Problems solved by technology

However, when the diameter of the welding wire becomes thicker, the welding heat input must be increased, otherwise it will not melt at all. With the increase of welding heat input, the harmful effect on the heat-affected zone of the base metal will also increase correspondingly

Therefore, according to conventional technical thinking, in order to obtain a very low welding heat input, the diameter of the welding wire must be reduced, and reducing the diameter of the welding wire will lead to a great reduction in welding efficiency, so that the contradictory characteristics between them cannot be resolved.

[0005] Prior to this, some people in China had developed gas-shielded welding twisted steel wire rope welding wire, see "Electric Welding Machine" 1981 Issue 02 "Narrow Gap Gas Shielded Welding with Twisted Welding Wire", but the rigidity of the steel wire rope welding wire is very poor, and it is stable when the wire is automatically fed. Poor performance, twisting and swinging when melting at high temperature, resulting in unstable arc, uneven weld width, poor forming, prone to undercuts, unfused side walls and other defects, so it has not been effectively promoted

However, the stability of steel wire rope twist welding wire during welding is even worse, and there are no successful cases and documents.

[0006] Therefore, the high heat input during welding of the existing stainless steel welding materials will lead to poor toughness of the weld metal, large welding deformation, and sensitivity to stress corrosion, etc., which urgently need to be improved.

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