JPH0250830B2 - - Google Patents

Description

Detailed Description of the Invention The present invention is a rotating arc welding method in which materials to be welded are welded by horizontally circularly moving an arc with a predetermined diameter. This invention relates to a rotating arc welding method that allows a shape to be obtained.

The present inventors have invented a rotating arc welding method in which a flat bead with relatively shallow penetration can be obtained by first causing an arc generated from the tip of an electrode to move horizontally and circularly at high speed. (Japanese Patent Application No. 54-42014, Japanese Patent Application No. 55-79618) According to the above-mentioned invention, the materials to be welded can be welded with high efficiency without causing material defects. , focusing on the rotation speed of the arc,
As a result of research into the relationship between arc rotation speed and bead shape, it was discovered that depending on a specific arc rotation speed, a biased phenomenon occurs in the bead.

The present invention was made based on the above findings, and includes fillet welding the corners of materials to be welded while circularly moving an arc at a rotational speed within the range of 5 to 10 hertz. By welding at the rotation speed within the above range while alternating the rotation direction, both corners of the workpiece are laminated and welded, thus creating a biased bead at an angle of 7 to 15 degrees at the weld. , is characterized by welding the corners with good penetration.

Next, the present invention will be explained with reference to examples and drawings.

Figure 1 is a diagram showing the rotational speed of an arc that performs horizontal circular motion and the deviation angle of the bead.The horizontal axis is the rotational speed of the arc, and the vertical axis is the average deviation of the bead with respect to the reference line a shown in the figure. The deviation angle θ of the bead with respect to b is shown. From the drawing, the rotation speed of the arc is
It can be seen that in the range of 5 to 10 Hz (300 to 600 r.pm), the bead deflection angle changes within the range of 7° to 15°, and especially when the arc rotation speed is around 7 Hz, the bead deviation angle changes. The maximum deviation angle will be 15°.

Figures 2A and 2B are diagrams showing the relationship between the direction of rotation of the arc and the direction of bead formation, where 1 is a wire, 2,
2' is the vertical member, 3 is the bottom member, and 4 is the arc.
Figure b shows the case of left rotation as well. When the arc 4 is rotated clockwise by the wire 1 as shown in A of the same figure,
The generated bead will be an upwardly skewed bead A,
On the other hand, when the arc 4 is rotated to the left by the wire 1 as shown in FIG.

Therefore, when welding is performed by rotating the wire 1 in one of the directions shown in FIG. Can perform flesh welding.

An example of this will be shown below.

(1) Test steel material SS41, plate thickness 10mm (2) Welded joint Fillet weld (3) Wire diameter 1.2φmm, (4) Arc rotation diameter 7φmm (5) Arc rotation speed 7 hertz (420r.pm) (6) Arc current 300A (7) Arc voltage 33V (8) Welding speed 22cm/min As a result of fillet welding under the above conditions, an excellent bead with no undercut was obtained.

Figure 3 is a cross-sectional macro view of narrow gap welding with multiple electrodes using the method of this invention.
5' indicates the material to be welded, 6 indicates the narrow gap, and the bead A was formed by rotating the leading electrode clockwise. Beads B were formed by rotating the row electrodes counterclockwise. In this way, by alternately stacking the beads A and B, the narrow gap 6 can be efficiently welded.

An example of this will be shown below.

(1) Test steel material SS41, plate thickness 150mm (2) Welding groove width 10mm, (3) Wire diameter 1.2φmm, (4) Arc rotation diameter 6φmm, (5) Arc rotation speed 7 hertz (420r.pm) ( 6) Arc current 350A (7) Arc voltage 35V (8) Welding speed 25cm/min As a result of performing narrow gap welding under the above conditions, the problem of insufficient penetration of the groove wall, which is the key to narrow gap welding, has been completely resolved. This resulted in very good welding results and improved welding efficiency.

As described above, according to the method of this invention, it is possible to take advantage of the advantages of rotating arc welding and to obtain a biased bead by simply moving the arc horizontally in a circular motion without performing any special oscillation operation on the welding nozzle. As a result, the structure of the welding device is simplified and a preferable weld shape can be obtained, which brings about excellent industrial effects.

[Brief explanation of the drawing]

Figure 1 is a graph showing the relationship between arc rotation speed and bead deflection angle, Figure 2 A and B are diagrams showing the arc rotation direction and bead formation direction in this invention, and Figure 3 is a graph showing the relationship between arc rotation speed and bead deviation angle. FIG. 3 is a front sectional view when narrow gap welding is performed. In the drawings, 1... wire, 2, 2'... vertical member, 3... bottom material, 4... arc, 5, 5'... material to be welded, 6... narrow gap, A... first layer beads,
B...Second layer bead.

Claims (1)

[Claims] 1. A rotating arc welding method in which materials to be welded are welded by horizontally circularly moving an arc with a predetermined diameter, the arc being rotated at a rotational speed within a range of 5 to 10 hertz. By welding the corner of the material to be welded while performing a circular motion, a biased bead at an angle of 7 to 15 degrees is generated at the welding part, thus welding the corner with good penetration. Rotating arc welding method. 2. In a rotating arc welding method in which materials to be welded are welded by horizontally circularly moving an arc with a predetermined diameter, the arc is circularly moving to the left at a rotational speed within the range of 5 to 10 hertz. While doing this, one corner of the material to be welded is welded, and a biased bead with an angle of 7 to 15 degrees is generated in the welded part upward to the left. Then, while making a circular motion to the right at the above rotation speed, , the other corner of the material to be welded is welded, and a skewed bead with an upward angle of 7 to 15 degrees is generated in the welded part, and thus both corners are welded with good penetration. Rotating arc welding method.