Back non-filling argon self-protective heat-resistant steel argon tungsten-arc welding flux-cored wire

Abstract

The invention discloses a back non-filling argon self-protective heat-resistant steel argon tungsten-arc welding flux-cored wire. A low-carbon cold-rolled steel strip serves as skin of the welding wire, and the skin is filled with mixed powder and then undergoes rolling and drawing for forming the flux-cored wire with the diameter fai ranging from 2.0 to 2.4; the powder is composed of, by weight, 2-7% of TiO2, 0.5-1.2% of X, 0.02-0.15% of C, 0.3-1.6% of Mn, 0.5-1.6% of Si, 0.05-0.12% of Ti, 5-7% of Y, 0.1-0.5% of V and the balance Fe and inevitable impurities relative to the welding wire, wherein X is one or more kinds of Al2O3, MgO and NaF, and Y is the mixture of Cr and Mo. According to the wire, the back surfaces of weld joints of backing layers of pipelines are free of oxidation, the tedious process step of argon-filled protection in the pipelines is eliminated, the welding process is simplified, and the construction cost is lowered. In addition, the performance of the welding process is good, the all-position welding adaptability is good, and the mechanical property and the toughness are excellent.

Description

technical field [0001] The invention belongs to the technical field of welding materials, in particular to an argon-free self-protecting heat-resistant steel tungsten argon arc welding flux-cored welding wire applied to the bottom of heat-resistant steel pipelines. Background technique [0002] Most of the pipes in the power station are small in diameter and cannot be welded on both sides. How to ensure the quality of the welding seam of the bottom welding layer of the pipeline is a key issue. For many years, in order to avoid the oxidation of the back weld seam, a series of anti-oxidation measures are often taken during the bottom welding. Argon filling protection not only requires more auxiliary man-hours, but also has a large labor intensity and wastes argon, which increases the welding cost and sometimes cannot guarantee the welding quality. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a self-protected he...

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Problems solved by technology

[0002] Most of the pipes in the power station are small in diameter and cannot be welded on both sides

How to ensure the quality of the welding seam of the bottom welding layer of the pipeline is a key issue. For many years, in order to avoid the oxidation of the back weld seam, a series of anti-oxidation measures are often taken during the bottom welding. Argon filling protection not only requires more auxiliary man-hours, but also has a high labor intensity and wastes argon, which increases welding costs and sometimes cannot guarantee welding quality

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