Slag-free flux-cored wire

Abstract

The invention provides a novel process for a formula of a slag-free flux-cored wire, and relates to a welding material. The manufacturing method adds the combination of molybdenum powder, nickel powder and rare earth silicon to a formula of raw materials, eliminates mineral powder in a common formula, and optimizes the proportion of various types of metal powder in the formula. According to the formula, the welding material comprises the following components: 4 to 8 parts of micro carbon ferrochromium, 12 to 18 parts of low carbon ferromanganese, 56 to 67 parts of iron powder, 2 to 6 parts of molybdenum powder, 0.1 to 0.4 part of ferroboron, 2 to 5 parts of rare earth silicon, 1 to 3 parts of ferrosilicon, 2 to 3 parts of ferrotitanium, 2 to 3 parts of sodium fluoride, 3 to 7 parts of ferroaluminum, 1 to 3 parts of aluminum to magnesium powder and 4 to 8 parts of nickel powder. The invention improves the toughness, strength and anti-fatigue performance of welding seams and thins welding-seam grains by adding the combination of molybdenum powder, nickel powder and rare earth silicon into the raw materials of the formula, eliminating the mineral powder in the common formula, and optimizing the proportion of various types of metal powder in the formula. Meanwhile, slagging on the surfaces of the welding seams is avoided, and welding efficiency is raised by 20 percent compared with slag-type processes.

Description

technical field [0001] The invention belongs to the field of welding technology and relates to a welding material for welding steel plates with a tensile strength of 700-800Mpa. Background technique [0002] At present, the production technology of flux-cored welding wire in China is basically mature. Due to the limitation of the flux-cored formula, in order to make the deposited metal achieve a certain welding performance and weld beauty in the welding process of ordinary flux-cored welding wire, acid slag formula is selected and added to the formula. Add slag-forming mineral powder; the acidic slagging mineral powder contained in the basic formula is: 30-35 parts of rutile, 4-8 parts of quartz, 1-2 parts of cryolite, 1-2 parts of sodium fluoride, zircon sand 1-3 parts, 2-4 parts of fluorite, 1-3 parts of potassium feldspar, 2-4 parts of wollastonite. Will inevitably cause like this to carry out a slag removal once welding a weld seam, has increased worker's labor intensit...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a formula of slag-free flux-cored welding wire to solve the problem of slag removal on the surface of the weld and the problem of welding efficiency that cannot be solved by the prior art