JPS5817708B2 - Vertical automatic arc welding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vertical automatic arc welding device that is particularly applicable to base materials having curved surfaces.

Generally, vertical welding such as electrogas welding is often applied to vertical base materials, but it may also be applied to base materials with curved surfaces.

In any case, a consumable welding wire is continuously supplied to the welded part of the base metal, and a plate made of copper or the like is pressed against both sides of the joint to prevent molten metal from flowing into the joint. It is held in such a manner as to move upward along the joint portion as welding progresses, and the joint portions are successively welded in the vertical direction.

By the way, when the base material is a curved surface, the aiming angle of the welding wire with respect to the liquid level of the molten metal changes continuously.

However, in order to perform good welding, it is necessary to adjust the aiming angle of the welding wire so that it always maintains a constant angle with respect to the liquid level of the molten metal.

Conventionally, this has been adjusted visually by an operator as welding progresses, but the operation is complicated and extremely troublesome.

This invention automatically detects the change in the inclination angle of the welding torch due to the change in the inclination angle of the curved surface line of the welding part when welding the curved surface part of the base material, and adjusts the target angle of the welding wire with respect to the liquid level of the molten metal. An object of the present invention is to provide a vertical automatic arc welding device equipped with an automatic correction function that can be maintained constant at all times.

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

In FIG. 1, 1 and 2 are base materials, and 3 is a welding wire that is unwound from a wire reel (not shown) and is continuously supplied to the welding part via a welding torch 4.

5 and 6 are guide rollers, and 7 and 8 are receiving rollers. The guide rollers 5 and 6 are attached to the front support arm 9 of the welding wheel, and the receiving rollers 7 and 8 are attached to the upper and lower sides of the back support arm 10 of the welding wheel. It is rotatably mounted in two locations.

Then, each guide roller 5, 6 and receiving roller 7
．． 8 holds the joint portion of the base material 1.2 by a pressure mechanism via the front support arm 9 and the back support arm 10.

The pressure mechanism includes, for example, a pressure rod 11 and a pressure spring 12.
, a tightening nut 13, etc., and one end is the back support arm 1.
The front support arm 9 is pressed by the pressure spring 12 using a screw tightening nut 13 at the other end of the pressure rod 11 fixed at 0.

In the figure, these pressure mechanisms are provided at two locations above and below the central portions of the support arms 9 and 10.

Further, the front support arm 9 and the back support arm 10 respectively support backing plates 17 and 1B, and these backing plates 17 and 18 are configured to hold the molten metal 19 at the joints of the base materials 1 and 2. There is.

A fulcrum pin 22 is provided near the arc point 28 of the table support arm 9, and the pivot arm 21 is supported by the fulcrum pin 22 so as to be rotatable upward and downward.

Note that it is desirable that the fulcrum pin 22 be as close to the arc point 28 as possible.

This rotating arm 21 supports an inclination angle detector 20 and a welding torch 4 via a wire feeder at its rotating end.

That is, the wire feed motor 14 of the wire feeder is attached to the rotating end of the rotating arm 21, the inclination angle detector 20 is attached to the upper part of the motor 14, and the feed roller 15 of the wire feeder is attached. The wire introduction end of the welding torch 4 is attached to the support section 16.

The tilt angle detector 20 is, for example, a gyroscope used in an aircraft or the like, and outputs the tilt angle with respect to a horizontal plane as a voltage signal.

For example, an electric cylinder 23 is bridge-mounted between the front support arm 9 and the rotation arm 21 as arm rotation means.

That is, the main body of the electric cylinder 23 is connected to the rotating arm 21.
The cylinder shaft 24 is pivotally connected to the front support arm 9.

Then, as will be described later, the electric cylinder 23 is operated in accordance with the detection result of the inclination angle detector 20.

As shown in FIG. 2, the welding device configured in this manner is guided along the joint with the tips of the guide rollers 5 and 6 entering the joint, and is connected to a lifting device (not shown). It moves upward according to the progress of welding.

Next, the automatic tilt angle correction function of the welding torch 4 in this welding apparatus will be explained.

Now, as shown in Figure 3, the welding equipment sequentially welds from the curved surface welded part shown by C in the lower part, through the curved surface welded part shown by B in the middle part, to the vertical surface welded part shown by A in the upper part. Let's go.

For convenience, the explanation will be based on the welded portion indicated by A.

The liquid level of the molten metal 19 can always be indicated by the horizontal axis GL, as shown in FIG. 4, but in contrast, the axis of the joint of the weld A is vertical.

This vertical axis is represented by Y-Y'. The aiming angle of the welding wire 3 at this time is shown as the inclination angle a of the welding torch 4 with respect to the horizontal axis GL, and this is taken as an appropriate torch angle.

Further, at this time, it is assumed that the tilt angle detector 20 is fixed and tilted by an angle e with respect to the horizontal axis GL.

As shown in FIG. 5, the tilt angle detector 20 detects the change in angle from when the position angle is parallel to the horizontal line to the vertical line, and outputs the detection result as a voltage signal.

In other words, when the tilt angle detector 20 is parallel to the horizontal axis G, its output voltage is 0, and as the angle changes, the output voltage also changes, and the output voltage is parallel to the vertical axis YY'. When this happens, the EV voltage is generated.

Therefore, if the voltage when the inclination angle detector 20 is installed at an e angle is El, then when the inclination angle detector 20 is installed at an e angle and the generated voltage is El, the welding torch It can be said that the torch angle of 4 is in an appropriate state.

Now, if the welding equipment moves from welding part A to B in Figure 3, and unless the automatic torch angle correction function works, the torch angle of welding torch 4 will be as shown in Figure 4. , orthogonal line M of the curved surface line inclination angle 0-P of base materials 1 and 2
-N becomes the angle a' which is equal to the angle a.

If this is the angle b when viewed from the original position of the welding torch 4, the amount of change is ba'.

Therefore, the moving angle of the detector 20 becomes e+(ba'), at which point the automatic correction function works, and a voltage of E2v is generated in the tilt angle detector 20 as shown in FIG.

This detection voltage EaV is compared with the reference voltage of the reference voltage setter 25, which is balanced with the voltage E1V when the detector 20 is at the angle e, which is set in advance as shown in FIG. The output of the difference is amplified by an amplifier 27 and is input to the electric cylinder 23.

For example, if the input voltage is in the positive direction, the electric motor built in the electric cylinder 23 rotates in the forward direction, and if the input is in the negative direction, it rotates in the reverse direction, and the original E is balanced with the reference voltage.
, operates in the direction of returning to V.

That is, when the angle of the welding torch 4 changes, the inclination angle detector 20 detects the angle from the inclination angle of the curved surface of the welding part and converts it into a voltage.

This is compared with a reference voltage, and the electric cylinder 23 operates based on the positive and negative voltage difference, and the cylinder shaft 24 expands and contracts.

Then, the welding torch 4 is moved in the rotational direction via the rotating arm 21 with the fulcrum pin 22 as a fulcrum, and the torch angle aI'c with respect to the original liquid level of the molten metal 19 is set.
Return.

As described above, this invention has an automatic correction function that automatically maintains the appropriate torch angle of the welding torch with respect to the liquid level of the molten metal even when the base material has a curved surface. This is a vertical automatic arc welding device that eliminates the hassle of conventional visual inspection by the operator and prevents defects in the welding area, saving labor in welding work.
This greatly helps improve welding performance.

[Brief explanation of the drawing]

FIG. 1 is a side view of a welding device according to an embodiment of the present invention, FIG. 2 is a perspective view of essential parts showing the ascending operation of this welding device, and FIG. 3 is a schematic side view showing the welding sequence of this welding device. ,
FIG. 4 is an explanatory diagram showing changes in the torch angle of the welding torch,
FIG. 5 is an explanatory characteristic diagram showing the performance of the detector, and FIG. 6 is a hook system diagram showing the operating order of the present invention. 1.2...Base metal, 3...Welding wire,
4... Welding torch, 9... Front support arm, 14... Wire feeding morph, 19...
...Molten metal, 20...Detector, 21...
... Rotating arm, 22... Fulcrum pin, 23...
...Electric cylinder, 24...Urinda shaft, 2
5... Reference voltage setter, 26... Comparator, 27... Amplifier/amplifier, 28... Arc point.

Claims (1)

[Claims] 1. A welding wheel that moves upward along the joint portion of the base metal as welding progresses, a fulcrum pin provided near the arc point of this welding wheel, and a fulcrum pin attached to the fulcrum pin. A rotating arm is supported to rotate freely in the vertical direction, and a consumable welding wire is continuously fed from a wire feeder supported by this rotating arm, and is held in the joint of the base metal. a welding torch that guides toward the molten metal; a tilt angle detector that is supported by the rotating arm together with the welding torch and detects the tilt angle of the welding torch with respect to the liquid level of the molten metal; By rotating the upper rotating arm according to the detection result of the device, the welding torch is rotated about the arc point as a fulcrum, and the arm is rotated to maintain the inclination angle of the welding torch at a preset constant angle. A vertical automatic arc welding device characterized by comprising a moving means. 2. The vertical automatic arc welding apparatus according to claim 1, wherein the inclination angle detector is a gyroscope that outputs the detection result as a voltage signal. 3. The arm rotating means is an electric cylinder in which one of the cylinder body and the cylinder shaft is pivotally connected to a welding wheel, and the other is pivotally connected to a rotating arm. Vertical automatic arc welding equipment.