Methods for manufacturing flux cored wire for welding stainless steel and products thereof

Abstract

Disclosed is a method for manufacturing a flux cored wire for welding stainless steel of 0.9-1.6 mm in diameter having a seamed portion, which the method includes the steps of: forming a hoop (stainless steel 304L or 316L) into a U-shape and filling the hoop with a flux mixture, thereby forming a tube having a seamed portion; performing a primary drawing process on the tube shaped wire using a lubricant; performing a bright annealing process to relieve work hardening of the primarily drawn wire; performing a secondary drawing process on the wire until an accumulated reduction ratio after the bright annealing process falls within the range of 38-60%; physically removing a lubricant residue on the surface of the secondarily drawn wire; and coating the wire with a surface treatment agent.

Description

[0001] Cross References to Related Applications [0002] This application claims priority from Korean Patent Application No. 10-2005-0076596 filed on Aug. 22, 2005, the entire contents of which are incorporated herein by reference. technical field [0003] The present invention relates to a manufacturing method of a flux cored wire (flux cored wire, FCW) for welding stainless steel, and more particularly, the present invention relates to a manufacturing method of a flux cored wire for welding stainless steel having a weld seam, the flux cored wire not only It can be welded by hand, semi-automatic welding and robot welding. Background technique [0004] Generally, stainless steel welding techniques include DC reverse polarity MIG welding (MIG), AC tungsten argon arc welding (TIG) and flux cored welding. [0005] First, MIG welding is a welding process that uses expensive shielding gas such as inert gas Ar or inert gas Ar mixed with 2-5% O 2 or CO 2 mixture. Advantages of ...

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Problems solved by technology

[0011] In addition, during the long-term robot welding process, due to poor conductivity, the temperature at the welding tip rises, and the welding tip is easy to wear

Also, poor arc stability during welding and increased spatter generation due to oxide film and wire-drawing lubricant clogging the conduits combine to reduce overall welding efficiency

As an attempt to solve the problems caused by baked wires (e.g., poor welding performance and manufacturing process efficiency, high manufacturing costs), many studies on non-baked wires are being carried out

But unfortunately the problem with non-baked wire is that it doesn't remove the lubricant as much from the surface as compared to baked wire, so the welded part becomes less resistant to defects during welding

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