Plasma arc fusion brazing method for thin-wall stainless steel and thin-wall red copper

Abstract

The invention discloses a plasma arc fusion brazing method for thin-wall stainless steel and thin-wall red copper. The plasma arc fusion brazing method for the thin-wall stainless steel and the thin-wall red copper comprises the following steps that impurities within 20mm of to-be-welded areas of a thin-wall stainless steel plate and a thin-wall red copper pipe, and thus metallic luster of the thin-wall stainless steel plate and the thin-wall red copper pipe is exposed; a pulse plasma arc welding machine is used for welding through an oblique ellipse single-point pause method; in the welding process, in the vertical angle, a welding wire is placed at the position forming 30 degrees with the upper surface of the thin-wall stainless steel plate; in the horizontal angle, the welding wire is placed at the position forming 70 degrees with the tangent line angle of the lower surface of the thin-wall red copper pipe; a tungsten electrode of the pulse plasma arc welding machine and the welding wire are located in the same plane, and an angle of 90 degrees is formed between the tungsten electrode and the welding wire; the tungsten electrode is 4-6 mm away from the thin-wall red copper pipe, and the tungsten electrode is 6-8 mm away from the thin-wall stainless steel plate; and welding arc quenching is performed to finish welding. The method has the advantages of being simple and reducing welding cost and the like.

Description

technical field [0001] The invention relates to the technical field of stainless steel and copper welding, in particular to a plasma arc melting brazing method for thin-walled stainless steel and thin-walled red copper. Background technique [0002] Stainless steel and copper welding, currently commonly used welding methods are aerobic acetylene welding, resistance butt welding, brazing and tungsten argon arc welding, etc. The filling material in production is mostly silver-based copper wire or silver-based liner. Due to the advantages of the narrowest melting temperature, low melting point, electric corrosion resistance, excellent permeability and toughness, good fluidity and wettability of silver-based copper wire, it can be quickly welded and formed, and the higher the silver content, the easier it is to weld. Due to its advanced and excellent welding equipment, most of the silver content of the filling material for the copper tube-stainless steel tube plate fillet joint ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the silver-based copper welding wire in the filling material of the copper tube-stainless steel tube plate fillet joint technology in China at the present stage has a high silver content, res

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