JPH10244370A - Method for adjusting height of reinforcement of weld in arc welding and its welding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust reinforcement of weld to have a prescribed height while maintenance of speed in high speed welding and prevention of undercut are contrived by using multiple electrodes. SOLUTION: In arc welding using multiple electrodes in a groove 2 between oppositely facing base materials 1, 1, a wire-like electrode 4 preceding in the welding direction is energized by the first required current necessary for securing a required penetration depth, while a succeeding belt-like electrode 5 is used longitudinally along the welding direction and energized by the second required current necessary for securing a required deposited metal quantity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for adjusting a margin height in arc welding in which the margin height is adjusted by controlling a welding current and controlling a posture of a strip electrode with respect to a groove width.

[0002]

2. Description of the Related Art In a submerged arc welding method, which is an example of a conventional welding method, welding is performed by heat generated from an arc between an arc welding wire and a base material or between an arc welding wire. It is hidden from the outside by lurking in the above flux. In addition, as a method of adjusting the height of the surplus in arc welding, there is a method of adjusting the heat input and the welding speed. However, in order to obtain sound welding quality, the welding speed has to be reduced.

[0003]

However, extra parts in arc welding are often unnecessary in strength design, and when repeated stresses are applied, the strength of the members is rather reduced due to stress concentration. become,
From an economical point of view, there is a problem that the welding wire is wasted. For this reason, it is required to control the extra height to a predetermined height. However, in order to form a normally healthy weld, the extra height is more than necessary.

[0004] In this arc welding, it is possible to adjust the height of the margin by controlling the welding speed. This method can be used within a welding speed at which a sufficient amount of deposited metal can be ensured, but when the welding speed is increased beyond the upper limit speed, there is a problem that undercut occurs.
On the other hand, in the state where the amount of the deposited metal is insufficient, in order to fill the extra height to the specified height, it is necessary to reduce the welding speed until the amount of the deposited metal can be secured, or to increase the welding current value. When the welding speed is reduced, productivity is reduced, and when the welding current is excessively increased, an undercut occurs.

The present invention solves the above-mentioned problems, and
It is an object of the present invention to provide a method for adjusting the height of surplus in arc welding and a welding machine capable of adjusting the surplus to a prescribed height while maintaining a high welding speed and preventing undercut by using multiple electrodes. Aim.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a method for adjusting a height of a margin in arc welding by using a plurality of electrodes in a groove between opposed base materials. When performing welding, the first necessary for securing the necessary penetration depth to the wire-like electrode preceding in the welding direction.
A required current is supplied, and the subsequent strip electrode is used for a long time along the welding direction, and a second required current required for securing a required amount of deposited metal to the strip electrode is supplied.

In addition, the strip electrode is rotated around the vertical axis and held so as to have an angle with respect to the welding line, and by controlling the distance that the strip electrode occupies in the groove width direction,
The bead width is adjusted.

According to the welding machine of the present invention, a plurality of electrodes are arranged along the welding direction, a wire-like electrode is provided as an electrode arranged in front of the welding direction, and a strip-shaped electrode is arranged in the welding direction as an electrode arranged behind. In addition to the arrangement, the belt-shaped electrode is rotated around a vertical axis and held so as to be able to change the angle with respect to the welding line.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1 to FIG. 4, a groove 2 is formed between the butting surfaces of the opposing base materials 1 and 1. The arc welding apparatus 3 uses a plurality of electrodes, uses a wire-shaped electrode 4 as an electrode arranged in front of the welding direction, and uses a strip-shaped electrode 5 as an electrode arranged behind, The strip electrode 5 is provided long in the welding direction. The strip-shaped electrode 5 is arranged so as to have an angle with respect to the welding line as needed, and is rotatable around a vertical axis.

In this configuration, when performing arc welding, the wire-shaped electrode 4 and the strip-shaped electrode 5 are arranged such that their tips lie under the flux 6 arranged on the groove 2. By the way, as shown in FIG. 4, the wire-shaped electrode 4 and the strip-shaped electrode 5 each have a region where welding can be performed stably in relation to the current value and the amount of deposited metal. The required amount of weld metal Y ₁ required to form a sound welded portion at the set extra height is determined by the first necessary current X ₂ and the first weld metal amount Y ₂ to be supplied to the wire electrode 4, and the band electrode. 5 has the following relationship with the second required current X ₃ and the second deposited metal amount Y ₃ .

[0011] During welding, the first required current X ₂ required to ensure a preceding wire electrode must penetration depth 4 in the welding direction is energized, to ensure the required deposited metal amount Y ₁ a strip electrode 5 subsequent the second required current X ₃ required to be energized. That is, it required deposited metal amount Y ₁ required for adjusting the set height excess prime the welded portion, the wire-like electrode 4
Selection and deposited metal amount Y _2, the sum of the deposited metal amount Y ₃ brought about by the strip electrodes 5, the first required current X ₂ and the second required current X ₃ so as to secure the necessary weld metal amounts Y ₁ to bring the I do.

The band electrode 5 is rotated about the vertical axis and held at an angle to the welding line, and the distance a occupied by the band electrode 5 in the groove width direction is controlled. The bead width b can be adjusted. Further, since the strip electrode 5 is long along the welding direction, the molten pool 7
Becomes longer in the welding direction, the time required for the slag 8 to float on the upper surface of the bead 9 is secured, the slag 8 is prevented from being caught, and welding is strong against undercut.

[0013]

As described above, according to the present invention, the first necessary current required to secure the necessary penetration depth to the preceding wire-like electrode is supplied, and the necessary amount of deposited metal is secured to the succeeding strip-like electrode. It is possible to control the extra height to the set height by supplying the second necessary current required for the operation. In addition, the bead width can be adjusted by rotating the strip electrode about the vertical axis and controlling the distance that the strip electrode occupies in the groove width direction.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a welding method according to an embodiment of the present invention.

FIG. 2 is a schematic view showing the welding method.

FIG. 3 is a schematic view showing the welding method.

FIG. 4 is a graph showing a stable welding area in the welding method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1 Base material 2 Groove 3 Arc welding apparatus 4 Wire electrode 5 Strip electrode 6 Flux 7 Weld pool 8 Slag 9 Bead

Claims (3)

[Claims] When performing arc welding using a plurality of electrodes in a groove between opposed base materials, a first required current required to secure a necessary penetration depth to a preceding wire-like electrode in a welding direction. , And a second necessary current required to secure a required amount of deposited metal to the strip electrode is applied while using the subsequent strip electrode long along the welding direction. Adjustment method. 2. The bead width is controlled by rotating the strip-shaped electrode around an axis in the vertical direction so as to have an angle with respect to the welding line, and controlling the distance occupied by the strip-shaped electrode in the groove width direction. 2. The method for adjusting a height of a margin in arc welding according to claim 1, wherein the height is adjusted. 3. A plurality of electrodes are arranged along a welding direction,
A wire electrode is provided as an electrode disposed in front of the welding direction, and a strip electrode is disposed long in the welding direction as an electrode disposed behind, and the strip electrode is rotated about an axis in the up-down direction and the angle with respect to the welding line. Characterized in that the welding machine is variably held.