CN102233491B - Self-shielded flux-cored wire - Google Patents

Abstract

The invention discloses a self-shielded flux-cored wire. The self-shielded flux-cored wire comprises a steel strip and a welding agent, wherein, the welding agent is filled in the steel strip and comprises the following components by weight percentage: 1-3% of aluminum powder, 3-5% of rare earth silicon, 1-3% of ferrovanadium, 50-65% of high-carbon ferrochrome, 10-15% of niobium powder, 10-20% of ferromolybdenum and 2-5% of tungsten carbide; and the filling rate of the welding agent in the steel strip is 40-50%. By adjusting the proportion of the alloy powder, the self-shielded flux-cored wire has the advantage of higher hardness at room temperature or high temperature (up to 600 DEG C), thus expanding application occasions of the hard face material, and reducing limitation of operating temperature of a workpiece on the material as well as trivial procedures that a plurality of welding materials are needed during the welding process.

Description

Self-protection flux-cored wire

Technical field

The present invention relates to field of welding material, particularly a kind of self-protection flux-cored wire of high rigidity.

Background technology

Hard-face overlaying welding material mainly is divided into three directions at present: a kind of is Manual electric welding bar class, a kind of is the welding wire class, a kind of is band utmost point welding class, wherein welding wire class resurfacing welding material is divided into again welding wire for submerged-arc welding and self-protection flux-cored wire, self-protection flux-cored wire is a kind of adscititious gases or solder flux protection that do not need, and is a kind of efficient, material-saving, flux-cored wire cheaply, and is efficient: because it easily is automated, weld seam is without slag, without the scarfing cinder problem, can realize continuous welding; Material-saving: because flux-cored wire can be saved the deposited metal about 25%; Low-cost: because of its undesirable gas or solder flux protection; thereby reduce production costs; but the resurfacing welding material on the market uses under room temperature environment now; the overlaying surface hardness number is difficult to reach more than the 60HRC; when under hot environment, using; because high-temerature creep easily occurs material, cause lower hardness, so just more difficultly reach higher hardness number.

Summary of the invention

In order to overcome defects, the invention provides a kind of self-protection flux-cored wire, under room temperature and hot environment, all have high rigidity, can reduce the workpiece serviceability temperature to the restriction of material, enlarge the use occasion of hard material.

The present invention for the technical scheme that solves its technical problem and adopt is:

A kind of self-protection flux-cored wire comprises steel band and welding agent, and welding agent is filled in the steel band, and take the welding agent gross weight as benchmark, by weight percentage, the composition of described welding agent is as follows:

Aluminium powder: 1～3%;

Rare earth silicon: 3～5%;

Vanadium iron: 1～3%;

High carbon ferro-chrome: 50～65%;

Niobium powder: 10～15%;

Molybdenum-iron: 10～20%;

Tungsten carbide: 2～5%;

The filling rate that described welding agent is filled in the steel band is 40～50%.

As a further improvement on the present invention, described steel band is the cold-rolled strip of width 16mm, thickness 0.8mm, and take the cold-rolled strip gross weight as benchmark, by weight percentage, the chemical composition that contains in the described steel band is as follows:

Carbon: 0.010～0.055%;

Manganese: 0.10～0.30%;

Silicon: 0～0.030%;

Phosphorus: 0～0.020%;

Sulphur: 0～0.020%;

Aluminium: 0～0.060%.

Welding agent of the present invention is take high carbon ferro-chrome as main material and contain the high temperature alloy element, stiff dough is wear-resisting, accommodate the occasion of the high temperature resistant stress abrasive wear that is applied to below 600 ℃ and solid particle wearing and tearing, be specially adapted to the low stiff dough that impacts high abrasion (such as coal roller, air blast coal cover, pulping machine part, high-temperature dust removal fan blade, blast furnace feeding apparatus etc.) occasion and repair.

The invention has the beneficial effects as follows: welding agent adopts the mixture of high carbon ferro-chrome, aluminium powder, molybdenum-iron, vanadium iron, tungsten carbide, niobium powder and rare-earth silicon alloy powder, and by regulating the ratio between the different-alloy powder, the present invention is satisfied under condition of different temperatures, all have higher hardness, no matter be under the room temperature condition, or under high temperature (can up to 600 ℃) condition, higher hardness is arranged all, thereby enlarge the use occasion of hard material, reduce the restriction of workpiece serviceability temperature to material, needed the loaded down with trivial details operation of multiple welding material when reducing welding.

The specific embodiment

The present invention is take cold-rolled strip as outer parcel skin, and its inner welding agent alloy powder is comprised of high carbon ferro-chrome, aluminium powder, molybdenum-iron, vanadium iron, tungsten carbide, niobium powder and rare earth silicon.

The outer parcel of welding wire skin is the cold-rolled strip of 16mm * 0.8mm (width 16mm, thickness 0.8mm), and its other compositions that contain require to be (unit accounts for the percentage by weight of cold-rolled strip for each content) shown in the following table:

Element	C	Si	Mn	P	S	Al
							Content %	0.010-0.030	0-0.030	0.10-0.30	0-0.020	0-0.020	0-0.060

Its mechanical performance requires such as following table:

Tensile strength (MPa)	Elongation after fracture (%)	Hardness (HRB)	Roughness (μ m)
				≥270	≥36	30-60	0.6-1.8

When making welding wire; select the cold-rolled strip that meets above-mentioned requirements; to fully mix in the alloy powder of heterogeneity ratio preparation; by powder feeder medicinal powder package is wrapped in the steel band; being squeezed into the pole shape and being controlled its filling rate by extruder is 40～50%; adopt the drawing moulding process through drawbench again, making diameter is the self-protection flux-cored wire product of φ 2.0mm, φ 2.4mm, φ 2.8mm.

Be described as follows below by embodiment 1-5:

Embodiment 1:

Select satisfactory cold-rolled strip, according to the form below proportioning welding agent alloy powder (percentage by weight %):

Aluminium powder	Rare earth silicon	Alum iron	High carbon ferro-chrome	The niobium powder	Molybdenum-iron	Tungsten carbide
							1	5	2	62	14	12	4

The control filling rate is 42%-45%, makes the self-shielded welding wire of diameter phi 2.8mm.

Adopt this self-shielded welding wire to be welded by welding machine, adopting welding current during welding is 350-400A, voltage 30=35V, electrode extension 45mm.

Hardness number such as the following table of deposited metal under room temperature and the 600 ℃ of high temperature:

Embodiment 2:

Select satisfactory cold-rolled strip, according to the form below proportioning welding agent alloy powder (percentage by weight %):

Aluminium powder	Rare earth silicon	Alum iron	High carbon ferro-chrome	The niobium powder	Molybdenum-iron	Tungsten carbide
							2	4	1	64	15	11	3

The control filling rate is 43%-47%, makes the self-shielded welding wire of diameter phi 2.8mm.

Adopt this self-shielded welding wire to be welded by welding machine, the welding current that adopts during welding is 350-400A, voltage 30-35V, electrode extension 45mm.

Hardness number such as the following table of deposited metal under room temperature and the 600 ℃ of high temperature:

Embodiment 3:

Select satisfactory cold-rolled strip, according to the form below proportioning welding agent alloy powder (percentage by weight %):

Aluminium powder	Rare earth silicon	Alum iron	High carbon ferro-chrome	The niobium powder	Molybdenum-iron	Tungsten carbide
							3	5	3	52	14	18	5

The control filling rate is 40-43%, makes the self-shielded welding wire of diameter phi 2.8mm.

Adopt this self-shielded welding wire to be welded by welding machine, the welding current that adopts during welding is 350-400A, voltage 30-35V, electrode extension 45mm.

Hardness number such as the following table of deposited metal under room temperature and the 600 ℃ of high temperature:

Embodiment 4:

Select satisfactory cold-rolled strip, according to the form below proportioning welding agent alloy powder (percentage by weight %):

Aluminium powder	Rare earth silicon	Alum iron	High carbon ferro-chrome	The niobium powder	Molybdenum-iron	Tungsten carbide
							2	5	3	50	15	20	5

The control filling rate is 45-50%, makes the self-shielded welding wire of diameter phi 2.8mm.

Adopt this self-shielded welding wire to be welded by welding machine, the welding current that adopts during welding is 350-400A, voltage 30-35V, electrode extension 45mm.

Hardness number such as the following table of deposited metal under room temperature and the 600 ℃ of high temperature:

Embodiment 5:

Select satisfactory cold-rolled strip, according to the form below proportioning welding agent alloy powder (percentage by weight %):

Aluminium powder	Rare earth silicon	Alum iron	High carbon ferro-chrome	The niobium powder	Molybdenum-iron	Tungsten carbide
							3	3	3	65	10	14	2

The control filling rate is 42-47%, makes the self-shielded welding wire of diameter phi 2.8mm.

Adopt this self-shielded welding wire to be welded by welding machine, the welding current that adopts during welding is 350-400A, voltage 30-35V, electrode extension 45mm.

Hardness number such as the following table of deposited metal under room temperature and the 600 ℃ of high temperature:

Performance for protection self-protection flux-cored wire of the present invention; raw-material content requirement is in the welding agent alloy powder proportioning: the chrome content of high carbon ferro-chrome is greater than 30%; the aluminium powder aluminum content is greater than 97%; molybdenum-iron contains the molybdenum amount greater than 62%; the vanadium iron vanadium content is greater than 55%, and tungsten carbide tungstenic amount is greater than 90%, and niobium powder niobium content is greater than 98%; the rare earth silicon silicon content is greater than 50%, whole mistake 60 mesh sieves of raw material in the above-mentioned alloy powder proportioning.

As fully visible, the present invention at ambient temperature overlaying surface hardness can reach the HRC value for 63-66, and it is 68 that theory can reach the HRC value; Overlaying surface hardness can reach the HRC value for 50-52 under high temperature (below 600 ℃) condition, and reaching as high as the HRC value is 55.

Self-protection flux-cored wire of the present invention is not restricted to the described embodiments, and the improvement in any claim scope according to the invention and variation are all within protection domain of the presently claimed invention.

Claims (2)

1. a self-protection flux-cored wire comprises steel band and welding agent, and welding agent is filled in the steel band, it is characterized in that: take the welding agent gross weight as benchmark, by weight percentage, the composition of described welding agent is as follows:

Aluminium powder: 1～3%;

Rare earth silicon: 3～5%;

Vanadium iron: 1～3%;

High carbon ferro-chrome: 50～65%;

Niobium powder: 10～15%;

Molybdenum-iron: 10～20%;

Tungsten carbide: 2～5%;

The filling rate that described welding agent is filled in the steel band is 40～50%.

2. self-protection flux-cored wire according to claim 1, it is characterized in that: described steel band is the cold-rolled strip of width 16mm, thickness 0.8mm, take the cold-rolled strip gross weight as benchmark, by weight percentage, the chemical composition that contains in the described steel band is as follows:

Carbon: 0.010～0.055%;

Manganese: 0.10～0.30%;

Silicon: 0～0.030%;

Phosphorus: 0～0.020%;

Sulphur: 0～0.020%;

Aluminium: 0～0.060%.