JPS5841148B2 - welding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for supplying welding wire to a welding device.

Welding, especially inert metal arc welding, is known as a method for making high-quality welded connections with few defects, but when welding plate materials, a nozzle is opened to supply inert gas (inert gas) to the welding part. The size of the welding nozzle is large compared to the tip, and the movement of the welding nozzle is restricted, making it difficult to weld together materials with a certain thickness or more.

For this reason, conventional methods have been adopted in which the welding wire (also referred to as wire or welding core wire) is given a bending pattern and the bottom surface of the groove is alternately welded on one side at a time without weaving (swinging) the welding nozzle. However, since the arc does not oscillate, there is a problem that poor penetration occurs 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 create a bend in the wire. The direction is irreversible, causing problems such as uneven weaving due to spatter adhering to the tip of the wire.

In order to solve these problems, the inventor first supplied the welding wire 1 from a direction parallel to the axis of the feed roller as shown in FIG. The movable member 2 is oscillated by the drive device 3 and the supply direction is changed by 90 degrees so as to be supplied to one point (contact point) on the contact generatrix of the pulling roller 4, thereby giving a waveform deformation to the welding wire 1. Then, it was proposed to supply the contact tube 5 (FIG. 1 shows a welding nozzle of the type cooled by cooling water).

In this way, the end 6 of the corrugated welding wire 1 (hereinafter referred to as wire 1) moves back and forth within the groove (left and right in the drawing), forming a stable arc and narrowing the gap. First, an arc trajectory 7 as shown in FIG. 3 is created to form a good weld bead.

In the case of such welding, the wire is stably supplied to the contact tube 5 which serves as a welding nozzle, and the contact tube is designed for use in narrow grooves, and is designed to be as small as possible and protrude from the tip of the nozzle, especially for narrow grooves in thick plates. It is strongly desired that the distance between the wire end and the groove sidewall be appropriate.

The purpose of this invention is to propose a structure of a welding device that can reduce the size of a contact tube, which is a welding nozzle, and form a stable arc, and can suitably weld narrow grooves such as thick plates.

In short, the present invention comprises a wire feeding device having an inlet end and an outlet end for the wire, and a contact tube and a pulling roller set on two sides for drawing out the wire from the wire feeding device, and the outlet end is at the contact point of the pulling roller. On the wire supply side, the wire supply device is oscillated so as to reciprocate with respect to the contact point, thereby giving a wave-like deformation to the wire sent out from the pulling roller, and the contact tube is configured to apply wave-like deformation to the wire sent out from the pulling roller. It has a hole with a diameter smaller than the free amplitude, and the welding wire is received in the hole before the first wave crest of the wavy wire fed from the roller appears at the entrance end of the hole. In this welding device, the contact tube is disposed close to the roller, and the amount of protrusion of the welding wire from the outlet end of the contact tube whose hole inlet end is opened in a morning glory shape is appropriately regulated. It is characterized by

This invention will be explained with reference to FIGS. 4 to 7.

The contact tube 5 has a drop between the peaks of the waveform,
That is, the welding wire 1 is supplied which is deformed into a wave shape and has a swing width of 2 a□ (vibration when undulating is defined as ao).

This contact tube 5 has a passage width W including the surface on which the welding wire swings.

A passageway 8 is provided.

Therefore, this passage width W.

When the welding nozzle receiving end is located close to the contact point of the traction roller, that is, the S dimension is made as small as possible, as shown in Fig. 2, welding wire rods with no restrictions on runout width can be used. The wire end of the wire with a swing width (free amplitude) of 2a□ has a diameter smaller than 2aO, that is, 2a.

Narrower width W.

The wire enters the passage 8 having a passage width of 200 mm and has a waveform as shown in FIG. It advances in the direction toward the welding part (downward in FIG. 4) in the passage 8 with an amplitude of 2a.

When the welding wire 1 exits the outlet end 9 of the contact tube 5, the end 6 of the welding wire recovers the swing width close to the swing width 2ao due to its elasticity, and in FIG.
Welding is performed with a horizontal deflection in the arc drawing, with a deflection width close to that of the welding arc.

Therefore, the passage width W. In this case, the welding wire is deformed within the elastic limit for the so-called wave shape, and the welding wire is allowed to advance as smoothly as possible, taking into account the friction between the welding wire and the wall of the passage 8 of the contact tube 5. When selecting dimensions within the range, it is possible to minimize the dimensions of the contact tube 5.

In addition, the distance of the position of the end 6 of the welding wire 1 from the groove side wall 10, that is, the dimension 1 to 3, is the projected length a of the amount of protrusion from the end of the contact tube 5 in the coaxial direction.
) is between 10 and 25.

When is selected in relation to the waveform amplitude 2a□ of the welding wire, welding is performed by forming a suitable arc.

It has been confirmed that a stable arc can be obtained when such a protrusion length is used.

If the three dimensions are too small, the arc creeps up into the welding wire passage of the contact tube and spatter adheres to the end of the contact tube, resulting in an unstable arc.

On the other hand, if the dimension a was too large, the welding wire of the protrusion would move irregularly, causing arcs that would cause poor integration on both sides of the groove.

In addition, the welding wire is selected to be suitable for the base material, so when forming the waveform of the welding wire, the rigidity of the welding wire may sometimes be used, and the diameter of the roller must be increased. Also occurs.

This means that the distance S (FIG. 2) between the surface including the roller axis and the inlet end of the contact tube is necessarily large.

In this case, if the inlet end of the contact tube is shaped like a morning glory (see FIGS. 6 and 7), the welding wire can be inserted smoothly.

In addition, if the dimension between the protruding end of the welding wire and the groove sidewall is not appropriate, the base metal and molten metal may not fuse sufficiently.
This results in instability of the arc and instability of the swinging of the wire, and it was confirmed that setting these six dimensions to between 1 mm and 3 produces a suitable result.

Gradually reduce the cut passage width W from the contact tube inlet side to make the passage width the final dimension W.

It may be possible to converge on the following.

By implementing this invention, the receiving and feeding of the wire becomes smooth, and the outer dimension C of the contact tube (Fig. 5) can be made significantly small, making the device suitable for narrow grooves. Therefore, when welding materials with narrow grooves on thick plates, there are no defects in the weld, the amount of deposited metal is small, and the work is easy. It has various effects such as being able to adapt to changes by replacing the rollers.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a device that forms a waveform and supplies welding wire, Fig. 2 is a partial sectional view of the device showing the state of the welding wire including a contact tube during welding work, and Fig. 3 is the same as Fig. 2 A cross section showing the locus I of the end 6 of the welding wire at the A-A cross section of
FIG. 4 is a cross-sectional view of the contact tube according to the present invention near the end on the welded part side, FIG. 5 is a cross-sectional view taken along line BB in FIG. 4,
FIG. 6 is a partial cross-sectional view of a contact tube 51 having a morning glory-shaped opening, and FIG. 7 is a longitudinal cross-sectional view of a contact tube showing an embodiment of the pond of the present invention. 1...Welding wire rod, 5, 50, 52...
Contact tube, 6... end of welding wire,
8...Passage, 9...Contact tube end, Wo...Final passage width, 2a...
... Runout width, a... Axial protrusion dimension of the welding wire from the end of the contact tube (projection length in the contact tube axial direction), b... Opening of the end 6 Distance from the anterior wall.

Claims (1)

[Scope of Claims] 1. Consists of a wire rod supply device having an inlet end and an outlet end for the wire rod, and a set of two pulling rollers and a contact tube that pull out the wire from the wire rod feeder, the outlet end being in contact with the pulling roller. The wire feeding device is configured to give a wavy deformation to the wire sent out from the pulling roller by swinging the wire feeding device so as to reciprocate with respect to the contact point on the wire feeding side of the point, and the contact tube The hole has a diameter smaller than the free amplitude of deformation, and the position of the entrance end of the hole is such that the receiver is inserted into the hole before the first wave crest of the wavy wire fed from the roller appears. The contact tube is arranged close to the roller, the inlet end is open in a morning glory shape, and the projection length of the welding wire from the outlet end of the contact tube in the direction of the axis of the tube is a. ) is between 10 mm and 25 mm. When the projection length a) of the welding wire from the outlet end of the contact tube in the axial direction of the tube is between 10 mm and 25 mm, welding is performed. A patent claim characterized in that a corrugated tangential wire is supplied to the welding part through a passage in a contact tube so that the end of the wire is at a position of 1 to 3n when closest to the groove side wall. range 1
Welding equipment as described in section.