JP2001321934A - Welding and joining methods for steel bar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the shape of a weld part regular so that no burrs are generated when welding and joining steel bars by an electrogas arc welding method. SOLUTION: When welding and joining tip parts 2 to each other by the electrogas arc welding method to be performed by opposingly arranging the tip parts 2 of the two steel bars 1, by generating an arc between the end faces of the opposite steel bars 1 to melt the end faces with arc heat and by pressing the end faces in the axial direction of the steel bars and welding them, after covering the butt part 4 of the tip parts 2 before the welding with a heat- resistant cylindrical body, and by wrapping the surroundings of this cylindrical body with flux, the tip parts are welded and joined to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for welding and joining steel bars.

[0002]

Conventional methods for welding and joining steel bars include gas welding and arc welding, and electrogas welding is one of them. In this electrogas welding, as shown in FIG. 4, two steel bars 1 are arranged so as to face each other so that the ends 2 abut each other, an arc 3 is generated between the end surfaces of the ends 2 and the end surfaces are heated by arc heat. Is melted and then pressurized P in the axial direction of the steel bar 1 to join them.
In the case of this electrogas welding, the butted portion 4 is covered with the flux 5 so as to prevent oxidation of the welded portion.

[0003] In the case of this electrogas welding, the following points are problematic. That is, as shown in FIG. 5, when two steel bars 1 are longitudinally joined, there is a problem that a flange-shaped burr 6 in which the molten metal protrudes and solidifies around the joint is generated. Further, in the case of the transverse joint, there is a problem in that the molten metal hangs down as shown in FIG. In view of the above circumstances, it is an object of the present invention to prevent burrs from being generated when welding steel bars by electrogas welding, and to provide a welded part having a uniform shape.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has two bar steel ends arranged opposite to each other.
An arc is generated between the end faces of the facing steel bars, the end faces are melted by arc heat, and the ends are welded to each other by an electrogas welding method in which the ends are welded by pressing in the axial direction of the steel bars. Covering the butted portion with a heat-resistant cylinder, providing a method for welding and joining steel bars, wherein the ends are welded and joined by the above-mentioned electrogas welding method by wrapping around the cylinder with flux, This is to solve the above problem.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail based on the embodiments shown in FIGS. That is, in the present invention, as shown in FIGS. 1 and 2, the butted portion 4 in which the ends 2 of the two steel bars 1 before welding are opposed to each other is covered with a cylindrical body 7 made of heat-resistant porcelain. After wrapping around the cylindrical body 7 with the flux 5, electrogas welding is performed. An electric current is applied to the steel bar 1, an arc is generated on the end face, and the end face is melted by the arc heat. The steel bars 1 are joined by applying pressure P in the axial direction. There is a slight gap between the steel bar 1 and the end of the cylindrical body 7, and the flux 5 acts through this gap.

[0006] The cylindrical body 7 is crushed and removed after welding. Since the butted portion 4 is covered with the cylindrical body 7 in advance in this way, the movement of the molten metal is restricted. Even in the case of the vertical joint shown in FIG. 1 or the horizontal joint shown in FIG. Reduce the occurrence. This cylindrical body 7 does not necessarily need to be made of porcelain, but may be made of metal such as copper. Further, it may be formed into a tubular shape by being split in advance and attached to the butted portion. And
The cylindrical body 7 may have a step on the outer surface as shown in FIG. 3A, or may have no step on the outer surface as shown in FIG.

[0007]

As described above, according to the present invention, the ends of two steel bars are arranged to face each other, an arc is generated between the end surfaces of the steel bars facing each other, and the end surfaces are melted by the arc heat so that the ends of the steel bars extend in the axial direction. When the ends are welded to each other by an electrogas welding method of joining by pressing, the butted portions of the ends before welding are covered with a heat-resistant cylinder, and the circumference of the cylinder is wrapped with a flux to form the electrogas The end portions are welded to each other by a welding method. As a result, the movement of the molten metal during welding is restricted by the cylindrical body. You can easily adjust the shape of
This is an effect that is excellent in practicality.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a case of longitudinal joint in an example of a method of welding and joining steel bars according to the present invention.

FIG. 2 is an explanatory diagram showing a case of crossover similarly.

FIG. 3 is an explanatory view showing a cylindrical body.

FIG. 4 is an explanatory view showing an electrogas welding method.

FIG. 5 is an explanatory diagram showing a state in which burrs are generated by longitudinal joining.

FIG. 6 is an explanatory view showing a state in which burrs are generated by crossover.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Steel bar 2 ... End part 3 ... Arc 4 ... Butted part 5 ... Flux 7 ... Cylindrical body

Claims (1)

[Claims] An electro-gas welding method in which two bar steel ends are arranged opposite to each other, an arc is generated between the end surfaces of the facing steel bars, the end surfaces are melted by arc heat, and the bars are pressed in the axial direction to join them. In joining the ends by welding, the butted portions of the ends before welding are covered with a heat-resistant cylinder, and the periphery of the cylinder is wrapped with flux, and the ends are welded to each other by the above-described electrogas welding method. Welding method for steel bars.