JPH05212542A - Automatic repetitive welding equipment for one side of narrow gap - Google Patents

Abstract

PURPOSE:To eliminate the flux spraying work before welding and the slug removing work after welding and continuously weld the multilayer without monitoring by improving the submerge arc welding method, and together, to make few the deform of angle and the number of welding layer by improving MAG welding method. CONSTITUTION:A data bank that a welding electric current, a welding velocity and a wire ejecting length, etc., are inputted, an arc sensor 6 automatically profiling the welding line, a welding power source 3, a welding truck 7, a wire feeding device 4, a welding torch 5 and its two-dimensional welding torch driving device 9, etc., are composed. A controller 1 that the welding condition of next welding layer is controlled based on the position information successively outputted from the driving device 9 and the output from the data bank during welding is provided, after the initial values of plate thickness and welding length of the material to be welded are inputted, the multilayer welding is repeatedly and continuously executed with repeating without cutting off the arc from the initial layer until the final layer due to the 'ON' of start switch.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a narrow groove single-sided automatic repetitive welding apparatus applied to steel structures.

[0002]

2. Description of the Related Art Conventionally, as shown in the sectional view of FIG. 5 (A), a submerged arc welding method has been used in plate joint welding of wide steel plates such as box girders and plate girders of bridges. However, this welding method requires the flux spraying work before welding and the slag removing and collecting work after welding, and it is difficult to carry out continuous multi-layer welding without monitoring. Further, as another thick plate welding construction method, a MAG as shown in FIG.
Welding is also used, but in order to reduce angular deformation etc. during construction, the inside of the groove is distributed with a low current and welded,
As the number of layers increases, the control function of the welding torch becomes complicated, and the groove angle is wide.

[0003]

As described above, the conventional submerged arc welding requires flux dispersion, slag removal, and recovery work, and since the welding groove is also X-shaped, after welding the groove on one surface in multiple layers. The steel plate is inverted by a crane and the groove on the other surface is welded in multiple layers, which requires a lot of man-hours. Also, in single-sided MAG welding, after forming a backside wave in the first layer at a groove angle of 50 to 60 °, both ends of the groove are distributed and welded by a low current, and the number of laminated layers is large in order to minimize angular deformation during welding. Therefore, the number of stacked layers increases in proportion to the thickness of the material to be welded, and further, since the both ends of the groove are distributed, the copying control method and driving device are complicated.

The present invention has been proposed in view of the above circumstances, and the submerged arc welding method has been improved to omit the flux spraying work before welding and the slag removing and collecting work after welding, and continuously without monitoring. It is an object of the present invention to provide an economical narrow groove one-sided automatic repetitive welding apparatus that enables various multi-layer welding and improves the MAG welding method to reduce angular deformation, the number of weld layers, and the like.

[0005]

To this end, the present invention provides a data bank into which a welding current, a welding speed, a wire protrusion length, etc. are inputted, an arc sensor for automatically copying a welding line, a welding power source, a welding carriage, and a wire. In a single-sided automatic repetitive welding device including a feeding device, a welding torch, and a two-dimensional driving device for the same, during welding, the welding of the next welding layer is performed based on the position information sequentially output from the driving device and the output from the data bank. Equipped with a control device to control the conditions, after inputting the initial values for the plate thickness and welding length of the material to be welded, the start switch is turned on to repeatedly and continuously perform multi-layer welding without cutting the arc from the first layer to the final layer. It is characterized by doing so.

[0006]

In the apparatus of the present invention, the welding torch, the drive system and the control system interface are mounted on the speed-controlled welding carriage, and if the numerical values of the plate thickness and the welding length are input to the control device, the arc sensor follows the welding line for the first time. Automatically repeats welding from layer to final layer, and multi-layer welding without supervision. At that time, an arc sensor is used to follow the welding line of the first layer in order to carry out narrow groove single-sided welding, and the second and subsequent layers store and reproduce the locus of the first layer traced by the arc sensor and stack the groove. By using the oscillating function of the welding torch according to the width and the 1-pass 1-layer method with high-current MAG welding, the number of laminated layers is reduced, the total heat input is reduced, and small welding such as angular deformation is performed. In addition, in order to perform automatic repeat welding without monitoring, a data bank in which the appropriate welding current, arc voltage, wire protrusion length, welding speed, etc. for each plate thickness, number of laminations, etc. are input, and the welding length, torch position during welding, Single-sided multi-layer welding of wide and thick plate joints by using a control device that takes in a position signal that outputs the welding carriage speed into the CPU and controls each drive system (here, wire feeding speed, welding carriage speed, etc.) It is possible to perform automatic welding repeatedly without monitoring.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an overall perspective system diagram thereof, FIGS. 2 and 3 are control system diagrams and control flow charts of FIG. 1, respectively, and FIG. It is explanatory drawing which shows the test result which performed the multilayer welding of the wide width thick plate.

First, in FIG. 1, 1 is an automatic control device, 2
Is its operation panel, 3 is a welding power source, 4 is a wire feeder for supplying a wire to the welding torch 5, and 7 is a thick steel plate 11 to be welded.
A welding carriage that moves in the direction of the welding line along a pair of traveling rails 10 attached above, 8 is a hand operation panel provided on the welding carriage 7, and 9 is an X arranged on the welding carriage 8. The welding torch drive shaft is composed of a relative movable member in the Y direction and the Y direction. The welding torch 5 and the arc sensor 6 are attached to the welding torch drive shaft 9, respectively.

In such an apparatus, welding can be performed in the following manner with reference to the control system diagram of FIG. 2 and the flowchart of FIG. Plate thickness is 25 mm and plate width is 1000 m
A case of multi-layer welding of a wide and thick plate of m will be described. (1) The welding carriage 7 and the welding line of the workpiece 11 are aligned, and the welding torch 5 is set on the tab plate at the welding start position. (2) The backing material 12 is brought into close contact with the material 11 to be welded. (3) Plate thickness “25” and welding length “1400” on the control panel 2
When (plate width 1000 mm + both tab plates 400 mm) is input, the appropriate welding construction conditions are displayed on the operation panel screen from the data bank. (4) When the welding start switch is pressed, the arc sensor 6 is activated after the arc is generated, the welding start position is stored, and the welding carriage 7 is started. (5) Under the welding conditions of the first layer, the welding carriage 7 moves to the welding end position (1
When it reaches 400 mm), the welding torch 5 rises to an arbitrary position specified by the data bank, the welding carriage 7 moves backward, and repeat welding is repeated up to the final layer. (6) The welding condition becomes the crater processing condition at the welding end position of the final layer, and after several seconds, the arc and the welding carriage 7 are stopped to complete the multilayer welding. (7) As a result, it was confirmed that unsupervised narrow groove single-sided multi-layer welding at a plate thickness of 25 mm had no problem with favorable back bead formation and internal defects such as blow holes.

(1) The position detector (potentiometer, etc.) mounted on the welding carriage is used to detect the welding length when welding on the ridge.
By feeding back the position signal of No. 2 to the control device, the point where the integrated value of the position detector and the welding length numerical value input initially match from the welding start position was set as the welding end position. (2) The welding power source and the wire feeding device were automatically controlled by a command from the control device so that the welding current voltage was a value drawn from the data bank. (3) The welding line copying is performed by using an arc sensor and feeding back the detection signal to the control device to control the position.
The position control locus of the first layer is stored and the welding lines of the second and subsequent layers are reproduced. (4) For the proper wire protrusion length, the welding torch rise amount setting value in the data bank was drawn out every time the repeated welding was switched, and the welding torch was automatically controlled to have an appropriate wire protrusion length. (5) The welding torch has a double shield system as a measure for preventing internal defects such as blowholes generated during welding. (6) For single-sided welding, glass tape is good for forming the back wave of the welded portion, so a method of fixing this with a water-cooled copper plate was adopted.

FIG. 4 shows a summary of the movement of the welding torches of one, two, and three layers, the bead cross section, the welding conditions, etc. in the above welding.

[0012]

According to such a device, the narrow groove one side V
Without cutting the arc from the first layer to the final layer of the groove-shaped thick plate,
Multi-layer welding can be performed continuously and repeatedly without supervision. Also,
The narrow groove single-sided welding makes it possible to omit the work of inverting the steel plate.

In short, according to the present invention, a data bank into which a welding current, a welding speed, a wire protrusion length, etc. are inputted, an arc sensor for automatically following a welding line, a welding power source, a welding carriage, a wire feeding device, and welding. In the one-sided automatic repeat welding device consisting of the torch and its two-dimensional drive, etc., during welding,
Equipped with a controller that controls the welding conditions of the next welding layer based on the position information sequentially output from the drive unit and the output from the data bank, and starts after inputting the initial values for the plate thickness and welding length of the workpiece. By turning on the switch, the arc is not cut from the first layer to the last layer, and the multi-layer welding is performed repeatedly and continuously, so that the reversing work is omitted and the large current MAG welding submerged arc to reduce the angular deformation etc. By improving the welding method and omitting the flux spraying work before welding and the slag removal and recovery work after welding, continuous multi-layer welding is possible without monitoring, and the MAG welding method is improved to improve the angular deformation and weld layer. INDUSTRIAL APPLICABILITY The present invention is extremely useful industrially because an economical narrow groove single-sided automatic repetitive welding apparatus with a reduced number is obtained.

[Brief description of drawings]

FIG. 1 is an overall perspective system diagram showing an embodiment of the present invention.

FIG. 2 is a control system diagram of FIG.

3 is a control flowchart of FIG. 2. FIG.

FIG. 4 is an explanatory view showing a test result of performing multi-layer welding of wide and thick plates by the welding device of FIG. 1.

FIG. 5 is a cross-sectional view showing conventional submerged arc welding and single-sided MAG welding.

[Explanation of symbols]

 1 Automatic Control Device 2 Operation Panel 3 Welding Power Supply 4 Wire Feeding Device 5 Welding Torch 6 Arc Sensor 7 Welding Cart 8 Hand Control Panel 9 Welding Torch Drive Axis 10 Welding Vehicle Running Rail 11 Welding Material (Thick Plate Steel Plate) 12 Back This material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Noriaki Murakami 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries Ltd. Hiroshima Works

Claims (1)

[Claims] 1. A data bank into which a welding current, a welding speed, a wire protrusion length, etc. are inputted, an arc sensor for automatically following a welding line, a welding power source, a welding carriage, a wire feeding device, a welding torch and its two-dimensional shape. In a one-sided automatic repetitive welding apparatus including a driving device, etc., during welding, a control device for controlling the welding condition of the next welding layer based on the position information sequentially output from the driving device and the output from the data bank is provided. After inputting the initial values for the thickness and welding length of the welding material, the start switch is turned on so that the multi-layer welding is performed repeatedly and continuously without cutting the arc from the first layer to the final layer. One-sided automatic repeat welding machine.