A metal-cored welding wire for welding automobile exhaust pipes

Abstract

The invention discloses a metal cored welding wire for welding of an automobile exhaust pipe. The welding wire comprises a welding wire flux core and an outer sheath wrapping the outer side of the welding wire flux core; the welding wire flux core comprises the following components in percentage by weight: 40-70% of chrome metal, 15-35% of ferrotitanium, 1-6% of manganese metal, 2-8% of ferrosilicon, 3-5% of Al-Mg alloy, 3-6% of an arc stabilizer and 1-3% of carbides. During welding, the welding wire is very low in splash, few in residue, stable in arc, and suitable for welding of a tail pipe, a silencer and the like used in an automobile exhaust system; through adoption of the welding wire, a formed welding seam is attractive.

Description

technical field [0001] The invention relates to welding technology, in particular to a welding material. Background technique [0002] Exhaust pipe is one of the important parts of automobiles. In order to improve the service life of automobiles, higher requirements are put forward for its performance. The exhaust pipe is subjected to a temperature of up to 1000°C, and it is also affected by Cl ˉ , SO4 2- , water, CO, etc., so the materials used must have high resistance to high temperature oxidation and corrosion resistance. Because ferritic stainless steel has good corrosion resistance, high temperature oxidation resistance and low cost, it is widely used in exhaust pipe materials. [0003] The exhaust pipe is mainly welded by gas shielding, and the solid wire welding is easy to cause coarse grains, which reduces the ability of the welded joint to resist intergranular corrosion and high temperature oxidation. In recent years, flux-cored wires have developed rapidly. At...

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Problems solved by technology

[0006] Aiming at the problem that the existing exhaust pipe welding materials cannot meet the needs of automobile development, the weld seam of the exhaust pipe is often oxidized and severely corroded, which eventually leads to the fracture of the weld seam and affects the service life of the automobile. The purpose of the present invention is to provide a Good resistance to high temperature oxidation and corrosion resistance, metal cored wire for welding automobile exhaust pipes

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