JPS63119980A - Transverse attitude welding method - Google Patents

Abstract

PURPOSE:To prevent the generation of a welding defect, and to improve the efficiency of a welding work by pushing up a molten metal in a molten pool by allowing mag netic force having specific directivity to work on a welding current flowing in the molten pool, and also, preventing the molten metal from sagging, by a copper patch. CONSTITUTION:Welding is executed by placing opposingly a surface side copper patch 11a provided with a water-cooling means and an exciting coil 13, and a reverse side copper patch 11b provided with a cooling means, through a base metal steel plate to be welded 1, feeding a welding wire 4, and connecting a feeding chip 18 and the steel plate 1 to a welding power source 20. The coil 13 is connected to an exciting power source 19 connected to the power source 20, an exciting current is given from an in on core 14 to which the coil 13 is wound and installed, and the power source 19, and by Lorentz's force, thereby, a weld metal 5 and an arc 23 are raised in the upper direction, and also, stirred by a vibration. In this case, to the coil 13, a DC current is applied in the direction where electromagnetic force which crosses a welding current flowing in a molten pool, and also, is in the direction for pushing up the molten metal 5 is generated. Or an AC current which crosses the welding current, and also becomes larger than the time for pushing up the molten metal 5, or the time when the force is reverse, or than the force is applied.

Description

[Detailed description of the invention] It applies to all things.

[Prior Art] Referring to FIG. 11 and FIG. 12, a conventional welding process is performed when a groove portion widened in the lateral direction is welded. Such horizontal welds tend to cause the weld metal to sag due to gravity and are generally inferior to downward welds in terms of quality and efficiency. That is, when horizontally welding the groove of the base material 1 shown in FIG. 11(A), if the heat input is increased to perform high-efficiency welding with a large amount of welding per weld, the welding as shown in FIG. 11(B) is performed. As shown in the figure, the weld metal sag, and welding defects 3 such as poor shape of beads 2 and poor fusion are likely to occur.

Therefore, when welding in a horizontal position as described above, a method of performing multilayer welding as shown in FIG. 11(C) under conditions of dwarf heat and a small amount of welding has been conventionally used.

In addition, as shown in Fig. 12 (A), the groove angle is made different between the lower plate and the upper plate of the base metal to be welded, and the groove angle on the lower plate side is made close to horizontal in particular. While welding is performed with a relatively high heat input, a method is used in which welding is performed with a small amount of heat and a small amount of welding of the finishing bead on the surface layer.

[Problems to be Solved by the Invention] However, by using multilayer welding using dwarf heat and a small amount of welding as shown in FIG. Another problem arises:

In addition, even the welding methods shown in Figures 12 (A) and (B) do not have sufficient welding efficiency, and furthermore, it is necessary to change the welding conditions between the inside of the groove and the surface layer, making it difficult to operate during welding work. There was a problem.

The present invention aims to solve the above-mentioned problems in conventional lateral position welding.The present invention aims to solve the above-mentioned problems in conventional lateral position welding, and does not cause welding defects such as poor fusion or poor bead shape, and also allows for easy welding operation and high efficiency welding. The purpose is to provide a welding method.

[Means for Solving the Problems] In order to achieve the above object, the present invention focuses on the welding current flowing in the molten pool, applies a magnetic force having a specific direction to the welding current, and generates a Lorentzian force between the welding current and the welding current. The aim was to generate a force that pushes the molten metal in the molten pool upward and to prevent the molten metal from sagging by using a copper dowel.

That is, the present invention applies a direct current to the excitation coil in a direction that generates an electromagnetic force that intersects with the welding current flowing in the molten pool and pushes up the molten metal, or The gist is to perform welding while applying an alternating current such that the time or force to push up the molten metal is greater than the time or force to push up the molten metal.

[Function] In the present invention, the relationship between the direction of the magnetizing current, the electromagnetic force F, and the shape of the bead is as shown in FIGS. 6 to 8.

However, in any case, Figure (A) (Figure 8 (AI)
(A2)) shows the direction of the magnetizing current, with the direction in which an upward magnetic field is generated as 0, Figure (B) shows the direction of the electromagnetic force F, and Figure (C) shows the shape of the bead 2. Note that the welding current is DC reverse polarity (welding wire 4 is +, base material steel plate 1 is -).
).

FIG. 6 shows the case where a magnetizing current of 10 is applied. Same figure (B)
When welding progresses from left to right, the molten pool 6 formed by the molten metal 5 is formed at the position where the arc is generated by the welding wire 4. Force F acts. As a result of the electromagnetic force F resisting the gravity W that causes the molten metal 5 to hang down, the bead 2 becomes as shown in the figure (
As shown in C), the top and bottom are approximately equal, and good welding is achieved.

As is clear from FIG. 7(A), FIG. 7 shows the case where a magnetizing current is passed in the opposite direction to that in FIG. 6. In this case, the electromagnetic force F acting on the molten metal 5 is in a downward direction and overlaps with the gravity W, so that the bead 2 sags even more significantly.

FIG. 8 shows the case where the magnetizing current is an alternating current as shown in (At) (A2) in the figure. In this case, the electromagnetic force F in the upward direction and the stirring force F' in the downward direction act alternately, as shown in FIG. 3B. However, if you change the width of the alternating current as shown in the same figure (AI),
In addition, by changing the intensity of the alternating current and increasing the electromagnetic force F in the upward direction as shown in the same figure (A2), it is possible to obtain a bead 2 that is uniform in the upper and lower directions as shown in the same figure (C). . Furthermore, in this case, the effect of accelerating the miniaturization of crystals and the floating of gas in the molten metal also occurs.

[Example] An embodiment of the present invention will be described below with reference to the drawings.

1 to 5 are explanatory diagrams of the lateral position welding device according to the present invention, in which FIG. 1 is a plan view, FIG. 2 is a front view, and FIG. 3 is an enlarged view of the main part of FIG. 1. FIG. 4 is a sectional view taken along line X--X in FIG. 3, and FIG. 5 is a back view of FIG. 3. Note that the same members as those in the drawings already described are designated by the same reference numerals, and the description thereof will be omitted.

lla in the figure is a backside copper pad to which a vibrator 12 for supplying cooling water and an iron core 14 around which an excitation coil 13 is wound are attached. Below this back side copper dot 11, a back side copper dot 11b having a vibrator 12 for discharging cooling water is arranged to face the base metal plate 1 as a material to be welded.

Here, both the back side copper dot 11a and the back side steel dot 11b are movable in the longitudinal direction of the wire (in the direction of the arrow). A front copper dot 15 is provided on the back side copper dot 11a to prevent the molten metal 5 from flowing forward. An insulating material 16 is provided at the hook portion of the copper butt 15 to prevent electrical conduction between the copper butt 15 and the welding wire 4. By the way, the welding wire 4 is fed to the welding part by the wire feeding roller 17 through the power feeding tip 18. The excitation coil 13 is connected to an excitation power source 19, and the excitation power source 19, the power supply chip 18, and the base steel plate 1 are electrically connected to a welding power source 20, respectively. In addition, 21 is a tab plate, 22 is a slag bath, 23 is an arc (current), and 24 is a welding metal. In such a device, the iron core 14
A direct current or alternating current of 1 to 30 Hz is applied from the excitation power source 19 as shown in FIGS. 6 to 8. In this case, the welding power source 20 is usually a DC power source, so it applies a DC or AC excitation current of 1 to 30 Hz, and the Lorentz force generated by the magnetic field and welding current lifts the molten metal 5 and the arc 23 upward, and also Vibratory stirring at 30 Hz.

Next, the operating principle of the device having the above structure will be explained with reference to FIGS. 9 and 10.

First, in Fig. 9, the excitation current flowing through the excitation coil 13 generates a magnetic field from the input direction to the B direction, and the current flowing from the wire 4 to the base steel plates 1a, lb causes the base material to flow into the molten metal 5. A Lorentz force F in the direction 1a is generated from the steel plate 1b.

(2) Next, in state B (FIG. 10) in which the direction of the current flowing through the excitation coil 13 has changed, a Lorentz force is generated in the direction from the base steel plate 1a to 1b due to the magnetic field in the direction B and the welding current. This principle makes it possible to lift the molten metal 5 upward and to vibrate and stir the molten metal 5 at a frequency of 1 to 30 Hz.

In this example, the above-mentioned apparatus was used to perform lateral position welding using magnetism. However, the iron core 14 of the back side copper pad 11a
For the excitation coil 13, a 1000-turn heat-resistant wire with a diameter of 1.2 B was used, and the magnetizing current was 5 A.
And so. In this case, the magnetic field strength at the center of the welded part with a plate thickness of 20 m was 300 Gauss. Also, the welding conditions are diameter 1.
Using 6wx flux-cored welding wire, welding current 4
When welding was carried out in a lateral direction using the method shown in FIG. 6 at 00 A, a voltage of 30 V, and a speed of 20 o/min, a weld bead that was uniform in the upper and lower directions was obtained.

Next, when the same lateral position welding as above was performed using the alternating magnetizing current shown in Fig. 8 (A) (the time ratio between the positive side and the one side was 2:12, and the frequency was 3 Hz), the bead shape also changed. The results were good and blowholes were also prevented.

As a comparative example, similar welding was performed using a magnetizing current of opposite polarity as shown in FIG. 7(A), and as a result, the bead had a bad shape with the upper part hollowed out and convex downward.

[Effects of the Invention] As detailed above, according to the present invention, it is possible to perform horizontal welding in a single layer in a horizontal position, which does not cause welding defects such as poor fusion or poor bead shape, is easy to operate, and is highly efficient. We can provide welding methods.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a horizontal position welding device according to the present invention, and FIG.
The drawing is a front view of Fig. 1, Fig. 3 is a detailed enlarged view of the main part of Fig. 1, Fig. 4 is a sectional view taken along the line X-X of Fig. 3,
FIG. 5 is a back view of FIG. 3, FIGS. 6 to 8 are explanatory diagrams showing the relationship between the direction of magnetizing current, electromagnetic force, and bead shape according to the present invention, and FIGS. 9 and 10, respectively. 11 and 12 are explanatory diagrams of the operating principle of the present invention, respectively, and FIGS. 11 and 12 are explanatory diagrams of the conventional horizontal position welding method, respectively. DESCRIPTION OF SYMBOLS 1... Base steel plate, 2... Bead, 4... Welding wire, 5... Molten metal, lla... Back side copper pad, ll
b... Backside copper pad, 12a, 12b... Pipe, 1
3... Excitation coil, 14... Iron core, 15... Front copper stopper, 17... Wire feeding roller, 18... Power feeding tip, 19... Excitation power source, 20... Welding power supply, 2
3... Arc (current), 24... Welding metal. Applicant Sub-Agent Patent Attorney Takehiko Suzue Figure 1 Figure 2 +01 + 01 Figure 9 Figure 10 Figure 11 (A) CB') 2nd Prisoner

Claims (1)

[Claims] In a horizontal position welding method in which welding is performed by movably disposing a front side copper butt equipped with a water cooling means and an excitation coil and a back side copper butt equipped with a water cooling means so as to be movably opposed to each other through the welded material, the above excitation coil is melted. Direct current is applied in a direction that generates an electromagnetic force that crosses the welding current flowing in the welding pool and pushes up the molten metal, or the time or force that crosses the welding current flowing in the welding pool and pushes up the molten metal is reversed. A horizontal position welding method characterized by applying an alternating current that is greater than time or force.