CN101125399A

CN101125399A - Carbon steel flux-cored wire used for gas shield welding

Info

Publication number: CN101125399A
Application number: CNA2007101312871A
Authority: CN
Inventors: 李振华; 居晓锋
Original assignee: CHANGZHOU JIUTONG WELDING MATERIAL CO LTD; CHANGZHOU HUATONG WELDING WIRE Co Ltd
Current assignee: CHANGZHOU JIUTONG WELDING MATERIAL CO LTD; CHANGZHOU HUATONG WELDING WIRE Co Ltd
Priority date: 2007-08-27
Filing date: 2007-08-27
Publication date: 2008-02-20

Abstract

The present invention relates to a welding wire, in particular to a welding wire with carbon steel flux cored which is applied in gas shielded welding with CO2 and Ar+CO2 as the shielding gas. The flux cored in the welding wire includes (according to the total weight percent of welding wire): TiO2 4-7.5; Si 0.3-1.0; Mn 1.2-3.0; SiO2 0.1-1.0, ZrO2 0.1-0.55, Fe 2-8; Al+Mg 0.5-1.5; the ration sum of K2O, Na2o, Li2O is 0.1-0.45; fluoride 0.05-0.2; oxide of rare earth metal 0.005-0.2; and the rest are inevitable impurities. The filling rate of the flux cored is 10-20 percent. When in use of the welding wire with flux cored, the arc is steady, the welding soot is less and the welding line has beautiful appearance of molding; and the present invention has high low-temperature impact toughness to melt metal.

Description

A kind of carbon steel cored solder wire for gas-shielded arc welding

Technical field

The present invention relates to a kind of welding wire, especially a kind of employing CO ₂And Ar+CO ₂Deng carbon steel cored solder wire for gas-shielded arc welding as protective gas.

Background technology

The advantage of CO 2 gas-shielded flux-cored wire welding is compatible welding rod and the welding of CO 2 gas-shielded solid core welding wire, its production efficiency height, welding technological properties is good, and composition of weld line and operating characteristics are adjustable.Therefore this welding manner has obtained using widely in steel construction processing and manufacturing processes such as boats and ships, bridge.Just because of this, at present also more and more higher to the functional requirement of flux-cored wire, but the present domestic flux-cored wire deposited metal v-notch summer is generally lower than low-temperature impact absorption merit, has influenced the application of flux-cored wire.China is from the gas shield flux-cored wire of external import at present, and per ton more than 2000 dollars, every year need a large amount of foreign exchange of cost.In order to improve the low-temperature flexibility of domestic flux-cored wire, adopt homemade flux-cored wire to substitute import, to save a large amount of foreign exchanges, developed this flux-cored wire.

Summary of the invention

The objective of the invention is to overcome the deficiency that prior art exists, provide a kind of arc stability is good, low-temperature impact toughness is good, weld seam smoothly reaches high comprehensive performance carbon dioxide gas arc welding with full position carbon steel flux-cored wire.

The technical solution adopted for the present invention to solve the technical problems is: a kind of carbon steel cored solder wire for gas-shielded arc welding, contain (accounting for welding wire gross weight %) TiO in the described welding wire medicinal powder ₂: 4-7.5, Si:0.3-1.0, Mn:1.2-3.0, SiO ₂: 0.1-1.0, ZrO ₂: 0.1-0.55, Fe:2-8, Al+Mg:0.5-1.5, K ₂O, Na ₂O, Li ₂The content sum of O: 0.1-0.45, fluoride: 0.05-0.2, the oxide 0.005-0.2 of rare earth metal, all the other are for inevitably being mingled with; The filling rate of medicine core is 10%-20%.When adopting this flux-cored wire welding, arc stability, weld fumes is little, and appearance of weld is attractive in appearance, the low-temperature impact toughness value height of its deposited metal.

TiO in the medicinal powder ₂Play the effect of slag making and stabilising arc, improve the moulding of weld seam and take off slag, SiO ₂Similar TiO is also arranged ₂Effect, can regulate slag fusing point and viscosity, help weld seam to the mother metal rounding off.ZrO ₂Be the all-position welding indispensable material, can effectively improve the fusing point of slag, make it the good weld seam that is covered in, prevent the tenesmus of vertical position welding molten iron, reduce sinter thickness, help the eliminating of weld seam gas.Al, Mg are strong deoxidiers, can improve low-temperature impact toughness, K ₂O, Na ₂O, Li ₂O and fluoride are arc stabilizers, and the effect of the physical and chemical performance of adjusting slag is played in the dehydrogenation agent.The oxide of rare earth metal has fixedly hydrogen, nitrogen, improves the effect of low-temperature impact toughness.

The invention has the beneficial effects as follows:

1. guarantee good arc stability, had good low-temperature impact flexibility again.-20 ℃ of low-temperature impact toughness of weld seam are greater than 80J, the good combination property of welding wire, all-position welding function admirable.

2. the oxide that has added rare earth metal improves its fixedly hydrogen, nitrogen effect, effectively raises the low-temperature impact toughness of weld seam.

3. add strong oxidizer aluminium, magnesium, improved the low-temperature impact toughness of weld seam, helped the discharge and the appearance of weld of weld seam gas.

The specific embodiment

Be described in further detail the present invention with embodiment below:

Embodiment one:

The steel crust of flux-cored wire adopts mild steel, and its chemical composition sees Table 1.

C	Si	Mn	S	P
C	Si	Mn	S	P	0.07	0.04	0.43	0.024	0.022

The filling rate of medicinal powder is 14.2%, and gage of wire is Ф 1.2mm.The chemical composition of medicinal powder is 5.6%TiO ₂, 0.48%Si, 2.5%Mn, 0.6%SiO ₂, 0.5%ZrO ₂, 3%Fe, 1.2%Al+Mg, 0.22% oxide (K ₂O, Na ₂O, Li ₂O), fluoride 0.1%, other are 0.04% years old.All the other are for inevitably being mingled with.

Soldering test is undertaken by following technological parameter and standard:

Welding current: 180-250A;

Weldingvoltage: 26-28V;

The welding number of plies: 5 layer of 13 road;

Interlayer temperature: 150 ℃;

Speed of welding 23cm/min;

Protective gas: 100%CO ₂(gas flow is 20ml/min);

Dry extension of electrode: 18mm;

The test piece for welding standard is undertaken by GB10045-2001.

Stretching and Impulse Test Result are σ _s=496MPa, σ _b=547MPa.δ＝31％。

When adopting the welding of this welding wire, arc stability, weld fumes is little, and it is easy to take off slag, and it is attractive in appearance to be shaped, and the impact absorbing energy of its deposited metal-20 ℃ is 110J.

Embodiment two:

The steel crust of flux-cored wire adopts mild steel, and its chemical composition sees Table 2.

C	Si	Mn	S	P
C	Si	Mn	S	P	0.07	0.04	0.43	0.024	0.022

The filling rate of medicinal powder is 13.2%, and gage of wire is Ф 1.2mm.The chemical composition of medicinal powder is 4.8%TiO ₂, 0.45%Si, 2.7%Mn, 0.6%SiO ₂, 0.42%ZrO ₂, 2.8%Fe, 1.0%Al+Mg, 0.28% oxide (K ₂O, Na ₂O, Li ₂O), fluoride 0.1%, other are 0.05% years old.All the other are for inevitably being mingled with.

Soldering test is undertaken by following technological parameter and standard:

Welding current: 180-250A;

Weldingvoltage: 26-28V;

The welding number of plies: 5 layer of 13 road;

Interlayer temperature: 150 ℃;

Speed of welding 22cm/min;

Protective gas: 100%CO ₂(gas flow is 20ml/min);

Dry extension of electrode: 18mm;

The test piece for welding standard is undertaken by GB10045-2001.

Stretching and Impulse Test Result are σ _s=510MPa, σ _b=565MPa.δ＝30％。

When adopting the welding of this welding wire, arc stability, weld fumes is little, and it is easy to take off slag, and it is attractive in appearance to be shaped, and the impact absorbing energy of its deposited metal-20 ℃ is 98.

Claims

1. a carbon steel cored solder wire for gas-shielded arc welding is characterized in that: contain (accounting for welding wire gross weight %) TiO in the described welding wire medicinal powder ₂: 4-7.5, Si:0.3-1.0, Mn:1.2-3.0, SiO ₂: 0.1-1.0, ZrO ₂: 0.1-0.55, Fe:2-8, Al+Mg:0.5-1.5, K ₂O, Na ₂O, Li ₂The content sum of O: 0.1-0.45, fluoride: 0.05-0.2, the oxide 0.005-0.2 of rare earth metal, all the other are for inevitably being mingled with; The filling rate of medicine core is 10%-20%.