JPH10328833A - Horizontal fillet welding for bridge beam and its equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high efficient welding method and its equipment capable of executing with one run horizontal fillet welding having an automatic weld line copying function and generating no undercutting or the like by plural welding torches having a different function arranged in series. SOLUTION: This equipment is composed of the preceding welding torch 7 having the automatic copying means of fillet weld line by an arc sensor, moreover making an arc a circular motion and executing preceding welding, the intermediate welding torch 8 providing high weldability securing a lower leg length by smoothly welding the bead toe in the weld bead by the preceding welding torch 7 and a lower plate side 17a, and making the arc the circular motion and executing the intermediate welding, the succeeding welding torch 9 securing an upper leg length by smoothly welding the bead toe in the upper part of the weld bead by the intermediate welding torch 8 and a vertical plate side, improving the shape of the weld bead and executing finish welding, and an actual article (or the vertical plate) copying means 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to a technical field applied to I-set fillet or I-set horizontal fillet welding of a steel structure such as a bridge girder or a steel beam member.

[0002]

2. Description of the Related Art There are various types of conventionally known horizontal fillet welding means having upper and lower leg lengths of about 15 mm, for example. CO2 Gas shielded arc welding means for welding multiple times. The automatic copying of the welding means is performed by using the arc sensor means at the first time and by the torch shift after the second time. (See, for example, JP-A-60-118384) Means using a plurality of welding torches having the same function. (See, for example, JP-A-62-24865)

[0003]

The above-mentioned prior art has the following problems. Requires a long time for welding. In multiple welding operations, the arc sensor is used for only one run, and in subsequent welding, the amount of shift of the torch is determined based on empirical values and the like, and beads are stacked. However, after welding distortion occurs, it may not be appropriate unless the torch shift amount is adjusted each time. This is achieved by changing the welding conditions of each welding torch. However, a plurality of torches must be separately copied and controlled, and the apparatus is complicated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a highly efficient welding method in which a plurality of welding torches arranged in series and having different functions can perform horizontal fillet welding without undercut or the like in one run with an automatic welding line profiling function. And to provide a device.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a welding torch and an actual (or upright) copying means in which at least three welding conditions are different in series when welding a horizontal fillet weld in a horizontal position. Are arranged at predetermined intervals, have automatic tracing control means for a fillet welding line by an arc sensor, and have a pre-welding process using a pre-welding torch that circularly moves the arc, and a welding bead and a lower plate using the pre-welding torch. The intermediate weld process with an intermediate welding torch that has a high weldability to secure the lower leg length by smoothly welding the toe of the bead and securing the lower leg length, The bead toe is smoothly welded to secure the upper leg length, and the finish welding process is performed using a subsequent welding torch to improve the weld bead shape. This is achieved by performing welding in one run by controlling the aiming position of the first layer by means of the target and controlling the aiming position to the final layer by means of actual (or upright) copying means.
The above object is an apparatus for welding a horizontal fillet weld in a horizontal position, having an automatic copying control means of a fillet weld line by an arc sensor, and making the arc circularly move, and a preceding welding torch for preceding welding. High weldability to secure the lower leg length by smoothly welding the toe of the weld bead to the lower plate side with the preceding welding torch, intermediate welding torch for circular welding of the arc and intermediate welding torch, and welding with the intermediate welding torch The upper part of the bead and the side of the standing plate are welded to the bead toe smoothly to secure the upper leg length, and the subsequent welding torch that improves the weld bead shape and finish welds, and the actual (or standing plate) copying means Is achieved by the following device.

[0006]

Embodiments of the present invention will be described with reference to the drawings.

Referring to the drawings, details of an apparatus for carrying out the welding method of the present invention will be described.

FIG. 1 and FIG. 2 show a portal frame 1 which runs on two parallel tracks 3 provided on a foundation 2 and has a horizontal posture on the upper side of one side of the portal frame 1. Rail 4
Are provided, and the rails 4 are
The two movable tables 6 having the rails 5 in the vertical posture are installed so as to be horizontally movable. As shown in FIGS. 3 and 4, one end of a gantry 11a provided with at least three welding torches 7, 8, 9 having different welding conditions and an actual copying mechanism 10 as shown in FIGS. Base plate 11 to support
Is provided so as to be able to be raised and lowered.

On the horizontal side of the gate-shaped frame 1, welding machines 12, 13 necessary for welding, a pail 14 of welding material, a control panel 15, and the like are mounted. In the figure, reference numeral 16 denotes an operation panel provided on the moving table 6.

On the other hand, the portal frame 1 has a transport direction parallel to the two parallel tracks 3 and straddles a transport device (not shown) such as a roller conveyor structure installed between the two tracks 3. A steel material 17 having a steel structure such as a bridge girder, a steel beam member, or the like is carried in and installed in the transfer device, and the portal frame 1 is arranged along the axis of the steel material 17.
While running independently, the two fillet welds where the web (lower plate) 17a and the flanges (standing plate) 17b of the steel material 17 intersect at right angles are welded in one run.

A preceding welding torch 7 is provided on the upper side of the gantry 11a. The preceding welding torch 7 has a means for automatically following a fillet welding line by means of an arc sensor and circularly moves the arc.

On the lower side of the preceding welding torch 7, the weld bead by the preceding welding torch 7 and the web 17a side are welded smoothly to the toe of the bead and have a high welding property to secure the length of the lower leg. A moving intermediate welding torch 8 is provided.

On the lower side of the intermediate welding torch 8, the upper part of the weld bead by the intermediate welding torch 8 and the flange 17b side are welded smoothly at the bead toe to secure the upper leg length and improve the weld bead shape. A row welding torch 9 is provided.

On the lower side of the succeeding welding torch 9, the upper end of the vertical rod portion 18 a of the support rod 18 having an L-shaped side surface is attached to the gantry 1.
An actual copying mechanism 10 which is fixed to 1a and has a roller 19 which is in pressure contact with the inner surface of the flange 17b is provided at the tip of a horizontal rod portion 18b constituting the support rod 18. Means for pressing the roller 19 against the inner surface of the flange 17b is such that the floating end of the gantry 11a is urged against the inner surface of the flange 17b by the spring action of a rotating shaft 11b with a spring that supports the gantry 11a to the base plate 11. It was done.

A horizontal fillet welding method using the welding apparatus configured as described above will be described.

As shown in FIG. 5A, while the portal frame 1 is moved, the preceding welding torch 7 is adapted to the intersection of the web 17a and the flange 17b, and the rotation speed of the arc is about 5 mm.
Initial welding is performed under the conditions of 0 Hz and a rotation diameter of about 3 mm, and also under the automatic contour control condition of the fillet welding line by the arc sensor. The bead a by this welding is as shown in the figure.

As shown in FIG. 5B, an arc of the arc is formed on the welding bead a by the preceding welding torch 7 and on the side of the web 17a by the intermediate welding torch 8 before the preceding welding bead a is cooled with a predetermined time delay. Under the condition that the rotation speed is about 2 Hz and the rotation diameter is about 5 mm, the lower leg length l ₁ is secured, the bead is formed into a bead shape in which the next bead is easy to be laminated, and the bead toe is formed under the welding condition having high welding property. Perform smooth intermediate welding. The bead b by this intermediate welding is as shown in the figure.

[0018] As shown in FIG. 5c, prior welding torch 7 and welding by intermediate welding torch 8 beads a, a b and the flange 17b side, while securing the bead shape improves and the upper leg l ₂ by the trailing welding torch 9 Performs finish welding with a smooth bead toe. The bead c by this welding is as shown in the figure.

As described above, the horizontal fillet welding is performed in one run by the three welding torches and the actual copying means having different welding conditions in series and the automatic welding means of the fillet welding line by the arc sensor. Can be done automatically.

[0020]

According to the configuration of the present invention as described above,
The following effects can be obtained. (A) With one to three welding conditions arranged in series and welding torches having different roles, for example, 6 to 1 in one run
Good bead formation can be achieved for horizontal fillet welding up to 5 mm, and bead shape can be easily improved. (B) Since the automatic following of the fillet welding line is performed by both the arc sensor and the actual copying means, even if the member to be welded is carried in obliquely with respect to the axis of the gate-type frame traveling rail, there is a deviation. The amount can be minimized, so that the copying performance can be ensured even in an apparatus using a plurality of torches arranged in series.

[Brief description of the drawings]

FIG. 1 is a perspective view of a welding device.

FIG. 2 is a front view of the welding device.

FIG. 3 is a side view of a welding torch group.

FIG. 4 is a rear view of the welding torch group.

FIGS. 5A, 5B and 5C are explanatory views showing a welding state and a bead shape by each welding torch.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 portal frame 2 foundation 3 track 4 rail 5 rail 6 moving stand 7 preceding welding torch 8 intermediate welding torch 9 trailing welding torch 10 on-site copying mechanism 11 base plate 11a gantry 11b spring-loaded rotary shaft 12 welding machine 13 welding machine 14 pail Can 15 control panel 16 control panel 17 steel 17a web (lower plate) 17b flange (standing plate) 18 supporting rod 18a vertical rod 18b horizontal rod 19 roller a welding bead b welding bead c bead l ₁ lower leg length l ₂ upper leg length

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI B23K 9/02 B23K 9/02 DE 9/12 331 9/12 331E (72) Inventor Toshimitsu Araki 118 No. Tsutsuzuka, Noda City, Chiba Prefecture Kawasaki Heavy Industries, Ltd.Noda Factory (72) Inventor Satoru Yamasumi, 118 Futatsuka, Noda City, Chiba Prefecture Kawasaki Heavy Industries, Ltd.Noda Factory

Claims (2)

[Claims] When welding a horizontal fillet weld in a horizontal position, at least three welding torches and actual (or upright) copying means having different welding conditions are connected in series at a predetermined interval. It has the automatic welding contour control means of the fillet welding line by the arc sensor, and the pre-welding process by the pre-welding torch that circularly moves the arc, the welding bead by the pre-welding torch and the lower plate side, the bead toe An intermediate welding process with an intermediate welding torch that circularly moves the arc with a high weldability that secures the lower leg length by welding smoothly, a smooth bead toe end between the upper part of the weld bead and the standing plate side by the intermediate welding torch A final welding process using a subsequent welding torch to secure the upper leg length by welding and improve the shape of the weld bead. A kind (or vertical plate) copying horizontal fillet welding method such as bridges 鈑桁, characterized by welding at 1 run by aiming position control up to the final layer by means. 2. An apparatus for welding a horizontal fillet weld in a horizontal position, comprising an automatic follow-up control means for a fillet weld line by an arc sensor, and circularly moving an arc to perform a preceding weld torch. The weld bead by the preceding welding torch and the lower plate side are welded smoothly to the bead toe, and high weldability to secure the lower leg length,
An intermediate welding torch that performs intermediate welding by circular movement of the arc, and the upper part of the weld bead and the standing plate side by the intermediate welding torch are smoothly welded to the bead toe to secure the upper leg length and improve the shape of the weld bead. A horizontal fillet welding apparatus such as a bridge girder, comprising: a succeeding welding torch to be welded; and an actual (or standing plate) copying means.