JPS59189098A - Production of powder-cored welding wire - Google Patents

Abstract

PURPOSE:To produce a powder-cored welding wire having good quality with good productivity in the stage of forming a steel strip into a U shape, packing the powder therein and producing the welding wire by heating the steel strip and the edge parts of the steel strip respectively to specific temp. and forge welding the same. CONSTITUTION:A steel strip 1 is supplied from an uncoiler 5 to a heating furnace 2 where the entire part of the steel 2 is heated to <=1,200 deg.C. Such strip 1 is formed to a U shape by forming rolls 3, 3' and only the edge parts of the strip 1 are heated to 1,200-1,450 deg.C by a welding horn 6. Powder is packed up to a prescribed level by a power packing machine 7 and the edge parts are forge- welded by forge welding rolls 4, 4'. The welded pipe is drawn according to need to a prescribed diameter. A blow brotective wall 9 is provided between the horn 6 and the machine 7 to prevent the contact of the blow with the rolls 4, 4' side, by which the satisfactorily forge-welded part is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for making a powder-cored welding wire in which 17 edges of steel strips are joined together.

The manufacturing method for powder-filled welding wire is generally to form a steel band into a U shape, fill it with powder, roll form it into a predetermined cross-sectional shape, and then wire-draw it. In this case, since the edges of the steel strip are not joined, the H section of the steel strip tends to open, and moisture or lubricants used during manufacturing can enter the powder through the opening, causing the powder to In addition to deteriorating, it is also inferior to a blockade human because it cannot be treated properly.

On the other hand, as methods to overcome the drawbacks of the above manufacturing methods, there is a method in which the edges of the steel strip are welded and joined after being filled with powder, or a method in which a steel pipe is filled with powder. The manufacturing method of joining the edges of steel strips by welding has low productivity due to the slow manufacturing speed, and the heat generated by welding has a negative effect on the powder, which can deteriorate the functionality of the powder. , and when electric welding is used, the powder (d) is swirled around by the magnetic field present and deposits on the edge of the steel strip.
Defects such as inclusions or blowholes occur in the forge weld and the quality of the forge weld deteriorates, making it difficult to obtain a predetermined diameter by wire drawing after f1.

In addition, in the manufacturing method of filling a steel pipe with powder, the powder is fed and filled into a long and thin steel pipe using vibration.

The filling time becomes very long and the powder filling equipment becomes complicated and large-scale.

The present invention makes it possible to manufacture a powder-filled welding wire that eliminates the drawbacks of the conventional means, and allows the edges of steel strips to be joined without deteriorating the function of the powder.

Chime, -7+', )jH% p,,%,': is easy to make on a small scale, and contains powder that reduces time and increases the heat properties A method of manufacturing a welding wire is provided.

That is, the present invention provides a method of forming a steel strip into an open groove, introducing filling powder into the groove, and manufacturing a pipe by joining four groove edges together, in which the steel strip is heated to 1200°C. The edge of the steel strip J is heated to 1200℃~.
This is a method for manufacturing a powder-filled welding wire, which is characterized by heating to 1450° C. and forge welding.

The present invention will be explained in detail below based on FIG.

Fig. 1 is an explanatory diagram of the manufacturing method according to the present invention, Fig. 2 is a schematic diagram showing the forming and forge welding process of the steel strip, and Fig. 3 is the powder light J
(This is a schematic diagram showing the plane of four parts. As seen in these figures, the steel strip 1 is fed from the uncoiler 5 and enters the heating furnace 2, and the entire steel strip 1 is uniformly heated.) 200℃
It is heated below. The reason why the heating temperature of the steel strip I is kept below 1 zoot is that after the heated strip/A1 is preformed into a U shape, the powder 8 that is filled contains a deoxidizing component and a low melting point alloy component. Therefore, when the steel strip l is heated to over 1200°C, the powder 8 oxidizes and the volume hl! This is because L1 loses its original function and deteriorates.

In particular, when the oxidation of the powder 8 is between ')jj, the band crushing 1
After the edges of 1 have been forge welded, it is preferable to perform one water cooling and air cooling. Heating furnace 2 f ) t! 'I missed it? 1if
i1 is formed into a U shape by forming rolls 3, 3', and the edge of the steel strip 11 is formed by forming rolls 3, 3' and forge welding roll 4.
, 4', to burn fuel gas such as liquefied petroleum gas or natural gas, and to burn air or acid;
A welding horn 6 having a burner nozzle that sprays a concentrated amount of water onto the edge of the vehicle 1 and the wood is heated to a temperature of 1200 DEG C. to 1450 DEG C. at which forge welding is possible.

When it is a 1200℃ vortex, a part of the steel strip 1 becomes z111.
If the temperature exceeds 1450℃, the elongation value will decrease.The forging 1 contact area is wide and there is a risk of 1air wire in the wire drawing process to obtain the specified diameter after the forging.
There is a situation. Edges are welded with unevenness 76
Powder filled into a steel strip heated to 1200°C to 1450°C Since the water contained in the liquid 8 is heated to 1000° C. or less, the water contained in the liquid is almost completely removed by this heat. Powder (L-L powder %/form or binder material such as water glass) 1 may be used. The powder filling machine may be equipped with one or more types of equipment, such as a vibrator (not shown), a screw pump, or a worm conveyor, depending on necessity.

Steel strip filled with powder 8 by powder filling machine 7].

For example, forge welding is performed by forge welding rolls 4 and 4', and when necessary, the wire is drawn to a predetermined diameter of m.
It leaks. When wire drawing is performed, the outer convex part (
Although it does not have to be cut, it is preferable that it be cut.

When the steel strip 1 is filled with powder 8 to a predetermined level in the powder filling machine 7, when the air or oxygen blow from the welding horn 6 is blown onto the filling side of the powder 8, the powder is 8 adheres to the edge of the steel strip 1, causing defects such as inclusions or blowholes in the forge welded part and deteriorating the quality of the welded part. It becomes difficult to do so.

Each to solve the above drawbacks! As shown in g+ iC.

The welding horn 5 blows air or oxygen only to the edges of the steel strip 1 on the side of the forming rolls 3 and 3', and the welding horn 6 and the powder filling machine 70 By providing a blow prevention wall 9 in between,
This is because air or oxygen cannot be blown to the forge welding roll 4.4' side.

Powder 8 is no longer deposited on the edge of steel strip 1, and a good residual joint is obtained, and a predetermined diameter can be obtained by wire drawing.

Furthermore, by adopting the method of forge welding the edges of the steel strip 1 in this manner, the production time can be significantly shortened compared to the method of welding the edges.

The effects of the present invention will be illustrated in more detail with reference to Examples below.

Powder-filled welding wire was manufactured based on the manufacturing conditions shown in Table 1. Wire N manufactured by the manufacturing method according to the present invention
α1~G (σ, φi, ' 6 mtn -4 can be processed without wire breakage and 0.ite.su71 (1-) opening, and both wire feedability and welding work are good with 41 temporary. , since the moisture in the light r11 powder has been almost completely removed, the spreadable hydrogen needle of the single-layer metal is greatly increased.
It was possible to reduce it to 1, and the rock-like properties of p'4 i'j-gold j7 were good.
1 and -N [k7 wire is φ4. ．．
5 m, 1 in m! The weld part opened, and the bead that was generated at the forge weld part of the Nα8 wire grew on the inner surface of the wire due to the wire drawing process ('), causing arc deflection. The beads formed on the wire were large and wire drawing was impossible.

+IILS solid η[''<The present invention has the advantage of obtaining a powder-filled welding wire of good quality, and during manufacturing 1:
It is possible to say that 11 is shortened, and it is clear that 4 is of great value (d).

[Brief explanation of drawings]

1 is an explanatory diagram showing the manufacturing method of the unexploded 9j; Figure 2 (d) is a schematic diagram showing the forming and forge welding process of the steel strip; and Figure 3 is a schematic diagram showing the plane of the powder light filling part. ]・(I: 'Steel 2 ・Heating furnace 3.3'
Forming roll 4, 4'... Forge welding roll 5 ・Uncoiler 6-... Welding avern 7
・Powder filling machine 8 Powder 9... Blow-proof seam wall Fig. 1 Fig. 2 τ

Claims (1)

[Claims] B1) In the method of manufacturing a tube by forming a hook into an open vortex, introducing filling powder into the vortex, and joining the edges of the groove, the steel strip is heated to 1200°C or less, and
- A method for manufacturing a powder-cored welding wire, characterized in that the edge of the tapped steel is heated to 1200°C to 1450°C and forge-welded to ≧41.