JPS5828025B2 - welding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a welding device that performs continuous welding operations, and in particular to a welding device suitable for narrow grooves.

Welding, especially inert gas metal arc welding, is known as a method for making high-quality welded connections with few defects, but when welding plate materials, the nozzle for supplying inert gas (inert gas) to the welding part is used in the bevel. Since the welding nozzle is large in size, the movement of the welding nozzle is restricted, making it difficult to weld together materials with a certain thickness.

For this reason, a method has been adopted in which the welding wire (also called wire or welding core wire) is bent and the bottom of the groove is alternately welded on one side at a time without weaving (swinging) the welding nozzle, but the arc swings. Since this process is not carried out, poor penetration and defects are likely to occur.

In addition, attempts have been made to pass the wire through a roller device equipped with a large number of rollers and rotate the entire wire to give the wire a bend. The melting mA row direction is irreversible, causing problems such as uneven weaving due to spatter adhering to the tip of the wire.

In order to solve this problem, the inventor has previously proposed a device for supplying a wavy wire to a forming port welding nozzle. This paper proposes the structure of a welding device having a welding wire supply means suitable for the following.

Conventionally, when continuously feeding wire rods like this, the driving rollers and deformation rollers are all arranged in series in a direction perpendicular to the surface of the welding base material.

Therefore, the device is tall and large, which poses a problem.

The purpose of this invention is to propose a welding device that is compact, can smoothly feed the wire, and stabilizes the arc, in which welding is performed by continuously supplying the welding wire while giving the wire a wave-like deformation. .

The structure of the apparatus according to the present invention will be explained below with reference to the drawings.

A wire 1 is supplied from a wire reel (not shown) via a conduit 2 to a welding device 3 according to the present invention.

In this case, a wire feeding device having a drive roller may be provided separately after the wire reel in order to unwind the wire from the wire reel in a circular manner.

A welding device 3 according to the present invention includes a wire supply device 4 and a roller device 5 including a welding nozzle.

These are installed in a device frame (not shown).

The wire fed into the conduit 2 which is parallel to the upper surface of the base material and whose axis is aligned with the swing shaft 7 is positioned along the outer periphery of the swing guide device 8 attached to the swing shaft 7 of the frame 6. into the arcuate conduit 9.

The wire-receiving end of the arcuate conduit (arc-shaped wire passageway) 9 is rotatably attached to the frame 6, and its attachment position is located on an extension of the swing shaft 7.

Since the shape of the arc-shaped conduit 9 is a smooth arc-shaped curve, the wire is moved from the other end, which is the nozzle side end 10 (outlet end), to a point on the generatrix that is in contact with the traction roller (referred to as the traction roller contact point). , will be sent out smoothly.

The swing guide device 8 reciprocates (swings) around the shaft 7 at a prescribed speed within a certain angular range by driving a connecting arm 12 connected to a variable speed geared motor 11.

The swing angle range α can be easily adjusted by adjusting the connecting position of the connecting arm 12 and the rotating plate 13 attached to the variable speed geared motor 11, that is, adjusting the eccentricity.

The wire extending from the arcuate conduit 9 is pulled by a pair of pulling rollers 14.

Further, the swing axis I is located approximately parallel to the axis of the roller 14, preferably within a plane containing the two roller axes.

Among the rollers, the shaft of the drive roller is connected to and driven by the reducer shaft in the box of the roller device 5, which is connected to the variable speed geared motor 15.

The wire 1 is a wavy wire 1a with a constant pitch determined by the swinging angle and speed of the arcuate conduit 9 of the swinging guide device 8 and the corresponding rotational speed (i.e., wire feed speed) of the pulling roller 14 of the roller device 5. It is formed and sent out at a specified speed.

The wavy wire 1a passes through a welding nozzle hole 18 of a welding nozzle 17 (also referred to as a contact tip) and its end 1
In b, the wire protrudes from the welding nozzle hole 18 and makes good contact with the inner wall of the welding nozzle hole 18 to form a steady arc at the groove, creating a weld bead and being gradually consumed.

The welding nozzle hole 18 has a cross section (e.g., oval, ellipse, rectangle, etc.) having a long axis and a short axis convenient for feeding the wavy wire.

The long axis is selected depending on the welding conditions, whether perpendicular to the bead forming direction or inclined.

The welding nozzle 1T is provided with a plurality of inert gas supply holes 19 and cooling water passages 20 near the welding nozzle hole 18.

In this way, a stable and continuous arc is formed between the wavy end of the wire 1a and the welded part, thereby forming the base metal plate 16a.

16b, a defect-free welded connection can be made.

In such a device, the arcuate conduit 9 located along the outer periphery of the swing guide device 8 is connected to the base material plates 16a, 16 from the conduit 2.
9 on a wire traveling parallel to b (usually horizontal)
It provides a direction change of 0 degrees and serves to descend perpendicular to the plane containing the axes of the two rollers 14.

However, in this case, in an effort to downsize the device, when giving the wire a bend that exceeds a certain limit, the waveform of the wire supplied to the welding nozzle is distorted to give smooth movement to the wire passing through the welding nozzle hole 18. become unable to do so.

Therefore, the arcuate conduits 9 are formed with smooth curved connections when lined up as shown in FIG. 5, and the curvature of each constituent curve is such that it has a smooth passage shape that only causes deformation within the elastic limit of the wire used. It is something to do.

The wire that exits the nozzle side end 10 of the arcuate conduit returns to its straight shape, enters the roller 14, and forms a wavy wire in cooperation with the swinging motion of the swinging guide device 8 by the roller 14. .

The present invention provides a welding device comprising a wire rod feeding device, a set of two pulling rollers for drawing out the wire from the wire feeding device, and a welding nozzle, wherein the wire feeding device has an arcuate wire passage having a wire inlet end and an outlet end. In addition, the wire supply device is swung approximately around the axis of a oscillation shaft that includes the inlet end so that the outlet end is reciprocated with respect to the contact point on the wire supply side from the contact point of the pulling roller. It is characterized by this.

In a further preferred embodiment, the welding apparatus is characterized in that the arcuate wire passage has a passage structure that does not cause plastic deformation when the wire passes through the passage.

By carrying out this invention, the supply of welding wire becomes smooth, the height of the apparatus can be reduced, welding can be performed within each ridge, and a good corrugated wire can be formed.
As a result, welding of narrow grooves in thick plates can be done quickly and easily without any defects, etc., which has many advantages.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the structure of the device according to the present invention, FIG. 2 is a cross-sectional view of a welding nozzle showing the formation of a corrugated wire and the displacement of the wire end, and FIGS. 3 and 4 are weld beads and FIG. 2 is a sectional view taken along line AA in FIG. 2 showing the relationship between welding nozzle holes, and FIG. 5 is an enlarged side view of the arcuate conduit. 1...Wire (welded wire rod), 1a...
Wavy wire, 1b... Wire end, 2.
... Conduit, 3 ... Welding equipment, 4 ...
...Wire supply device, 5...Roller device, 6...
... Frame, 7 ... Swing shaft, 8 ... Swinging chamber device, 9 ... Arc-shaped conduit (arc-shaped wire passage),
1o... Nozzle side end (outlet end), 11, 15
...... Variable speed geared motor, 12... Connection arm, 13... Rotating plate, 14... Traction roller, 16a, 16b... Base material board, 17.
... Welding nozzle, 18 ... Welding nozzle hole, 19 ... Inert gas supply hole, 2o ... Curved cooling water passage.

Claims (1)

[Claims] 1. Wire rod supply device 4, 2g for pulling out wire rod 1 from this wire rod supply device 4 & a set of pulling rollers 14, and welding nozzle 17
In the welding apparatus comprising: A welding apparatus characterized in that the wire supply device 4 is configured to swing about the axis of a swing shaft 7 that substantially includes the inlet end so as to be reciprocated relative to the wire rod supply device 4. 2. The welding apparatus according to claim 1, wherein the arcuate wire passage 9 has a passage structure that does not cause plastic deformation when the wire passes through the passage.