CN104785954B - A kind of high-intensity high-tenacity alkaline flux-cored wire - Google Patents

Abstract

A kind of high-intensity high-tenacity alkaline flux-cored wire disclosed by the invention, including crust and the alkaline medicated core being filled in crust, its crust uses mild-carbon steel strip, closes up drawing three process through rolling and makes, and its alkalescence medicated core acid-base value is 2.1 3.5.This alkalescence medicated core is prepared from by the raw material of following percentage by weight: ZrO₂3% 7%；Na₂SiF₆1% 5%；KAlSi₃O₈1.5% 6%；TiO₂2% 5%；CaF₂12% 25%；CaCO₃2% 6%；Al Mg alloy 1% 3%；Metal dust 25% 35%；Iron powder surplus.CO is used when the high-intensity high-tenacity alkaline flux-cored wire of the present invention welds₂Gas does protective gas, welding arc stablility, splashes and smog is few, easily take off slag, and appearance of weld is attractive in appearance, and weld strength is up to more than 830MPa, and has the low-temperature flexibility of excellence, it is adaptable to all-position welding 830MPa grade high-strength steel.

Description

A kind of high-intensity high-tenacity alkaline flux-cored wire

Technical field:

The invention belongs to technical field of welding materials, it is proposed that the alkaline flux-cored wire of a kind of high-intensity high-tenacity.

Background technology:

Along with socioeconomic development, use the industry of large-scale steel structure, as fluffy in building industry, shipbuilding industry, automobile industry etc. The exhibition of breaking out.It is more and more higher to the requirement of hardness of steel, and wherein 800-1500MPa high strength steel is used widely.Requiring While intensity height, its toughness, especially low-temperature flexibility be it is also proposed higher requirement.Therefore for the weldering of high strength steel Connecing, the research of the most supporting welding material causes the concern of Welder author.The flux-cored wire that Present Domestic uses is with acid Property slag system be main, splashing when using solder wire with acidity core welding less, easily takes off slag, arc stability, but weld seam diffusible hydrogen is higher.

Solder wire with acidity core great majority are applicable to the welding of 490MPa and 550MPa rank steel at present, and crack resistance is poor. For 800MPa and the steel of above intensity rank, from the point of view of requiring again it to have preferable low-temperature flexibility, solder wire with acidity core is the most not Its requirement can be met.Alkaline flux-cored wire is low because of its weld seam diffusible hydrogen, and crack resistance at low-temperature is excellent, is widely used in high intensity Welding for steel structure.But splashing relatively big because existing during alkaline flux-cored wire welding, de-slag is more difficult, smog is denseer, vertical position welding and horizontal position welding The shortcomings such as processing performance difference limit application.The alkaline flux-cored wire of a kind of high-intensity high-tenacity has been invented in this research, and it has Excellent welding technological properties, can carry out all-position welding.

Summary of the invention:

In view of problem above, a kind of high-intensity high-tenacity low hydrogen flux-cored wire, this medicine are it is an object of the invention to provide Core welding wire slag system belongs to alkalescence, splashes less, and the thin and de-slag of slag is easy, and smog is little, and appearance of weld is attractive in appearance, has the crack resistance of excellence Energy and low-temperature flexibility.It is applicable to weld 830MPa grade high-strength steel, can carry out putting down, stand, welding in the overhead position connects.

For achieving the above object, the technical solution adopted in the present invention is as follows:

A kind of high-intensity high-tenacity alkaline flux-cored wire, including crust and the alkaline medicated core being filled in crust, its crust Use mild-carbon steel strip, through rolling-close up-drawing three process makes, it is characterised in that described alkalescence medicated core acid-base value is 2.1-3.5。

In a preferred embodiment of the invention, described alkalescence medicated core is by the raw material preparation of following percentage by weight Become:

In a preferred embodiment of the invention, described metal dust is prepared from by the raw material of following percentage by weight

In a preferred embodiment of the invention, a diameter of Φ of described high-intensity high-tenacity alkaline flux-cored wire 1.2mm。

In a preferred embodiment of the invention, described TiO₂For rutile TiO₂。

Manufacturing process, welding technological properties and deposited metal composition are had by flux-cored wire filling rate of the present invention Material impact, as filling rate is higher, easily occurs fracture of wire in drawing welding wire operation, and during welding, electric arc is unstable；Filling rate On the low side, in deposited metal, chemical composition is less, affects weld properties.Based on above reason, the alkaline medicine of welding wire of the present invention The filling rate of core controls at 12%-18%.

In the present invention, ZrO₂Belonging to slag former, it can improve the freezing point of slag, and play stabilising arc effect.

Na in medicated core₂SiF₆Main Function is dehydrogenation, stabilising arc, but Na₂SiF₆During more than 5%, SiF₄、AlF₃Gas increases Many, cause arc stability to be deteriorated, splash and increase.

CaF₂Be one of the composition improving slag alkalescence, be extremely strong dehydrogenation, deoxidation material, can reduce slag fusing point and Viscosity, strengthens the mobility of slag, improves the covering of slag.But when content is more than 25%, welding fume increases, and slag spreadability becomes Difference, destroys arc stability simultaneously.

TiO₂Belong to acidic oxide, arc stability can be improved.TiO in the present invention₂Add in the rutile form.

CaCO₃Belong to basic anhydride, mainly slag making, gas making, protect molten bath, improve molten drop mobility and slag spreadability, If but addition is more than 6%, spatter is relatively big, and slag covers the most complete.

At KAlSi₃O₈In, main component SiO₂Molten drop can be refined, reduce the viscosity of slag.To carefully when addition is less than 1.5% Changing molten drop and reduce the viscosity DeGrain of slag, if addition is more than 6%, welding arc stablility is deteriorated, and splashes and increases.

In the present invention, the Al-Mg alloy of addition can deoxidation, denitrogenation, it is to avoid produce weld porosity.But formed after Al denitrogenation AlN belongs to polygon material and is mingled with, and to improving, welding seam toughness is unfavorable, so addition controls within 3%.

In the present invention except adding in addition to above-mentioned substance, be also added into some metal dusts, mainly ferrotianium, molybdenum-iron, On the one hand ferromanganese, ferrosilicon and crome metal, nikel powder etc., wherein ferromanganese, ferrosilicon can be as deoxidizers；On the other hand Mn, Si element It is transitioned in weld seam and improves weld strength.Remaining can thinning microstructure crystal grain, improve welding seam toughness, especially low-temperature flexibility.

When designing basic slag system flux-cored wire, slag acid-base value B decides the quality of welding wire welding technological properties.If B is the least, and weld seam diffusible hydrogen is higher, and B is excessive, and diffusible hydrogen is low, but unfavorable to welding procedure, as welding arc is unstable, and welding Splash big.So welding wire acid-base value B of the present invention controls at 2.1-3.5.Acid-base value B computing formula is as follows:

$B=\frac{{\mathrm{CaF}}_2+MgO+MnO+K_{2}O}{{\mathrm{TiO}}_2+{\mathrm{SiO}}_2+{\mathrm{Al}}_2{O}_3+{\mathrm{ZrO}}_2}.$

The high-intensity high-tenacity alkaline flux-cored wire of the present invention has an excellent welding technological properties, higher-strength and excellent Different low-temperature flexibility, it is adaptable to the 830MPa grade high-strength steel used under welding low temperature.

Detailed description of the invention

The high-intensity high-tenacity alkaline flux-cored wire of embodiment 1 to embodiment 3, including crust and the alkali being filled in crust Property medicated core, its crust uses mild-carbon steel strip, through rolling-close up-drawing three process makes the welding wire of a diameter of Φ 1.2mm, Last bundling is stand-by.

Each composition proportion of high-intensity high-tenacity alkaline flux-cored wire neutral and alkali medicated core of embodiment 1 to embodiment 3, alkalescence The filling rate of medicated core, acid-base value are shown in Tables 1 and 2.Each composition of alkalescence medicated core is commercially available material.Wherein ZrO₂、Na₂SiF₆、 KAlSi₃O₈Purchased from Heng Yun mining company, TiO₂Purchased from certain company of Australia, CaF₂Purchased from Guangfeng company, CaCO₃Purchased from high appearance Company, Al-Mg alloy is purchased from Shanghai nine ancient cooking vessel, and iron powder is purchased from Zhengzhou wlding company, and ferrotianium, molybdenum-iron, ferromanganese, ferrosilicon, crome metal are purchased From Qidong Jin Zhou company, nikel powder is purchased from Shanghai nine ancient cooking vessel company.

Table 1 alkalescence drug core component proportioning table

Table 2 metal powder constituent proportioning table

Three kinds of welding wires that such scheme is made are at CO₂Welding under gas shield, welding technological properties and mechanical property are as follows Table 3 and table 4:

3 three kinds of welding wire welding process condition of table

The mechanical property of 4 three kinds of embodiments of table

From table 3 and table 4, can be seen that three kinds of welding wires have the low of excellent welding technological properties, higher-strength and excellence Temperature toughness, it is adaptable to the 830MPa grade high-strength steel used under welding low temperature.

Claims (3)

1. a high-intensity high-tenacity alkaline flux-cored wire, including crust and the alkaline medicated core being filled in crust, its crust is adopted With mild-carbon steel strip, through rolling-close up-drawing three process makes, it is characterised in that described alkalescence medicated core acid-base value is 2.1- 3.5；

Described alkalescence medicated core is prepared from by the raw material of following percentage by weight:

Described metal dust is prepared from by the raw material of following percentage by weight:

2. a kind of high-intensity high-tenacity alkaline flux-cored wire as claimed in claim 1, it is characterised in that described TiO₂For golden red Stone-type TiO₂。

3. a kind of high-intensity high-tenacity alkaline flux-cored wire as described in claim 1 to 2 any one claim, its feature exists In, a diameter of Φ 1.2mm of described high-intensity high-tenacity alkaline flux-cored wire.