Preparation method of TIG welding wire for aluminum and aluminum alloy and capable of generating RE conversion film on substrate surface by soaking

Abstract

The invention discloses a preparation method of a TIG welding wire for an aluminum and aluminum alloy and capable of generating an RE conversion film on the substrate surface by soaking. The preparation method is characterized in that the pure aluminum or aluminum alloy is drawn to a specified wire diameter according to a conventional method, with the advancing speed of 5-8 m / s, the drawn pure aluminum or aluminum alloy is sequentially subjected to ultrasonic cleaning, degreasing, water washing for the firs time, alkali washing, water washing for the second time, soaking, drying, straighteningand wire cutting, and then the TIG welding wire for the aluminum and aluminum alloy is obtained, wherein the soaking process comprises the following steps: soaking the cleaned pure aluminum or aluminum alloy wire rod in a rare earth salt solution with the temperature of 25-35 DEG C for 15 -30 minutes, forming a local electrochemical micro-battery cell by a liquid-solid phase interface, taking thepure aluminum or aluminum alloy wire rod as a cathode, and depositing to form the RE conversion film when the local pH value of the pure aluminum or aluminum alloy wire rod exceeds 8. According to the preparation method, the RE conversion film generated on the surface of the welding wire is able to effectively prevent the generation of an aluminum-containing oxidation film; single-channel weldingseam is large in welding depth size, so that the welding efficiency is high, and the mechanical property of welding metal is excellent.

Description

technical field [0001] The invention relates to the field of welding wire manufacturing, in particular to a preparation method of a TIG welding wire for aluminum and aluminum alloys which is immersed in the surface of a substrate to generate a Re conversion film. Background technique [0002] Due to its excellent properties such as high strength, low density and corrosion resistance, aluminum alloys have been widely used in aerospace, shipbuilding, high-speed trains, automobile manufacturing and other fields. The corresponding welding materials and welding methods are also constantly changing. In research and exploration, TIG welding is one of the commonly used welding methods for aluminum and aluminum alloy welding. . [0003] At present, TIG welding wires for aluminum and aluminum alloys have the following defects: 1) Rare earths are added during the metallurgy of their raw materials, and the development and manufacture of high-quality TIG welding wires for aluminum and a...

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Problems solved by technology

[0003] At present, TIG welding wires for aluminum and aluminum alloys have the following defects: 1) Rare earths are added during the metallurgy of their raw materials, and the development and manufacture of high-quality TIG welding wires for aluminum and aluminum alloys are extremely restricted by the chemical composition of raw materials; 2) The traditional manufacturing method of TIG welding wire for aluminum and aluminum alloy cannot avoid the main component of Al on the surface of the finished wire. 2 o 3 thin oxide film, Al 2 o 3 The melting point of aluminum alloy is 2050℃, which is usually higher than that of aluminum and aluminum alloy bodies. When welding, entering the weld seam may cause defects such as oxide inclusions and pores in the weld seam; 3) When traditional aluminum and aluminum alloys are welded with TIG welding wire, The penetration depth of the single-pass weld is small, and the strength of the weld is limited to a certain extent, and the welding efficiency is low

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