JPS5950989A - Gas sealed flux cored wire - Google Patents

Abstract

PURPOSE:To provide a gas sealed wire which stabilizes the arc during welding and provides a better weld zone by adsorbing gas in the flux of the flux cored wire and sealing the gaseous atmosphere for welding therein. CONSTITUTION:Fine powder of flux components is mixed and granulated and the granules are filled in an alloy steel pipe. The gas in the pipe is once sucked away, then the gaseous atmosphere for welding is supplied into the pipe wire and is adsorbed in flux particles. Both ends of the pipe wire filled therein with the flux adsorbed with the gas are sealed and the pipe wire is drawn to a prescribed outside diameter, whereby the gas sealed flux cored wire is obtd. Since such wire is thoroughly expelled of N2 therein, the adverse influence of the N2 on the toughness of the weld zone is averted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flanox cored wire for welding which is improved by sealing in gas, and also includes a manufacturing method thereof.

Some Norasox core wire weights for CO2 welding and MAG welding have a 7-six n1 compound housed inside the tube. This type of Y\' requires deoxidation and work 1.
There are those that contain essential elements in the flux, and those that mix them mainly in the tube. There are small variations in composition and variations in reaction during welding, and exhibits better weldability. The present invention was obtained as a result of testing the latter wire, particularly to improve the toughness and ductility of the weld metal.

Franks Cored I) is installed by filling the inside of the tube with flux powder, subjecting it to heating and dehydrogenation treatment, and then drawing it to a predetermined outer diameter. Since this filling operation is carried out in the atmosphere, air is trapped in the wire product, and when the wire product is used for welding, the adverse effects of the N2 contained therein on the toughness of the welded part cannot be avoided.

The object of the present invention is to
It is an object of the present invention to provide a gas-filled wire that completely eliminates this, stabilizes the arc during welding, and provides better welding strength.

Another object of the present invention is to provide a suitable method for manufacturing such a single-man wire.

The gas-filled flanox cored wire of the present invention has a welding temperature of 4
) is characterized by containing flux particles adsorbing gas that forms a welding atmosphere inside the pipe line, and also enclosing a welding atmosphere gas.

The flux particles that have adsorbed the welding atmosphere gas may be granulated into an appropriate size by mixing fine powder in the flux, the surrounding gas removed by vacuum suction, and the particles placed in the welding atmosphere gas. Advantageously, this operation is carried out after the flux particles have been filled inside the tube made of melt.

Alternatively, it is possible to mix and granulate the fine powder of the flux component in a pressurized welding atmosphere gas. TJL to improve gas adsorption
After mixing the fine powder of the flux component, the surrounding gas may be removed by vacuum suction in the same manner as described above, and then the mixture may be placed in the welding atmosphere gas.

In order to accommodate flux particles inside a pipe line made of melted particles, whether or not they are adsorbing gas,
The Gally Agas filling method invented and separately proposed by the present inventors may be used. That is, the above-mentioned flux dog is supplied into the pipe along with the flow of welding atmosphere gas, and only the gas is allowed to pass through a filter provided at the end of the pipe, thereby causing the flux particles to settle. At that time, vacuum the filter side to help the carrier gas flow.
It is recommended that vibration be applied to promote flux particle movement and packing.

The tube wire filled with the gas-adsorbing flux core is drawn at both ends to have a predetermined outer diameter, thereby forming the above-mentioned gas-filled flanox cored wire of the present invention. When sealing both ends, it is a good idea to slightly pressurize the welding atmosphere gas. Incidentally, it is not a matter of course that steps commonly used in the production of Flanox Cord 1 Tsuya, such as heating dehydrogenation treatment prior to wire drawing and surface treatment after wire drawing, may be added.

The composition of the tube wire that becomes the melting point is arbitrary, but typical examples include: C: 0.15% or less, Si: 1.0%
Mn: 3.0% or less and B: 0.0
It contains 1% or less of Fe, with the remainder essentially consisting of Fe. If desired, Ti: 0.15% or less and/or S: 0.025% or less may be added.

Of course, the gas "N" flanox core wirer of the present invention is used in a welding atmosphere under 7-degrees of gas.

The gas sealed in the wire and the 7-ru gas have the same composition or combination, for example, both Ar-1-CO2
Usually, it is a mixed gas, but a combination of different gases, such as the sealed gas being an Ar1-O2 mixed gas and the Nord gas being C02, is also possible. As the welding process progresses, the dwire melts, causing the old gas in the tube to be released.Then, the gas adsorbed by the flux is released, generating a stable arc.N2 is completely removed. Since the stiffness is divided by 1, the toughness of the welded part is increased by +7.
<Cl□, Jl, nil In the melting process of the composition described above,
In particular, when mixed with an appropriate amount of Mn-13, it quickly becomes sticky. Even if added as desired, 1;
ttJl is very effective in improving toughness. 2 in size
, improve the bead shape.

Example A fine powder of 48 grains or more of 7 grains of flux containing rutile as a main component was wet-granulated in a Δr-l-20% CO2 gas atmosphere to form a granule with an average size of 0.5 rut.

This flux swan child d-1 was once placed in a container and degassed under vacuum, and then (Δr''-20% CO2) gas was introduced under pressure and adsorbed thereto.

Separately, a tube wire was made from an alloy with the following composition, C: 0.05
%, Si: 0.68
: 1.56%, +3: 0.003%
Ti: 0.15%, S: 0.
020% Fe: The remainder was filled with L flux particles using the above gas as a carrier gas. Both ends were heated to 600'C and dehydrogenated for 211.1 hours, then wire-drawn, with an outer diameter of 12m7Il, and the flux was tightly housed. I got it.

This wire was used for arc welding in a CO2 gas atmosphere with good results. That is, for comparison, the 7-yel V at -200C of a completely welded steel made with wire made using the same tube and 7 lasox without gas filling.
-Absorbed energy is 1,9-C5kg-rn (-v average 3
．． 6 kg-m, ), whereas that of the total contact steel with wire according to the invention is 6.2 L8
kg-m (average 7.4 kg-m).

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Claims (2)

[Claims] (1) A gas personal flux-j characterized by adsorbing the VC welding atmosphere gas inside the alloy steel pipe, accommodating Nokonononox particles, and removing the welding atmosphere gas.
art wire. (2) Alloy steel pipe contains C: 0.15% or less, Si:
1.0% or more -1., MIT: 3.0% or less and B
: Contains less than 001%, and as desired.
I'i: 0.15% or less, 1.・Yobi (sho/koQ)
,) S: 0.025% or less is contained, the remainder is substantially V and Fe, and the welding atmosphere is Δl.
' + 02 and CO2, which is a mixed gas of 2 (Φ or less -1). and J+ are filled inside the alloy steel layer, and after the internal gas is removed by suction, welding atmosphere gas is filled, both ends of the tube are sealed, and wire drawing is performed to obtain a predetermined outer diameter of 1 inch. (7I) A method for producing a gas-filled flux cored wire characterized by the following: (7I) Fine powder of flux components is mixed and granulated in a pressurized welding atmosphere gas, and this is welded inside an alloy steel pipe. A gas-filled Norax cored wire characterized in that the tube is filled by supplying an atmospheric gas as a carrier gas along with its flow, and after sealing both ends of the tube, it is drawn to give a predetermined outer diameter. Production method.