JPS59153583A - Welding method of curved wall member - Google Patents

Abstract

PURPOSE:To enable automatic welding under specified welding conditions by supporting curved wall members by means of plural fixed point supporting jigs disposed atop a stand and controlling the stand by a lifting device in such a way that the weld line is positioned level. CONSTITUTION:Plural sheets 2, 3 of curved wall members which are tack-welded are supported by means of fixed point supporting jigs 6 adjusted to the height conforming to the curved surface. Lifting devices 7 are then operated to adjust the angle of inclination of a stand 5. The adjustment is controlled by another device so that the instantaneous weld line, i.e., welding position, of a weld line 1 is positioned level. The welding place is thus so controlled as to be positioned level at all times during the time of welding along the weld line 1 in the above- mentioned way, by which the adoption of a highly efficient automatic welding machine is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a welding method for curved wall members, and more particularly to a welding method suitable for welding together curved steel plates such as curved nine-section outer panels during construction of hull blocks in shipbuilding.

In order to weld multiple curved outer panels when constructing a ship's hull block, etc., in the conventional technology, a curved wall member such as a steel plate, which has been bent into a predetermined curved surface, is placed at a height along the curved surface. The wall members were placed on a jig, and in this state, welding was performed along the welding lines that had been temporarily attached in advance to join the wall members together.

FIG. 1 is a diagram illustrating a complete example of the welding method for curved wall members according to the prior art. In FIG. Curved wall member 2.3
are placed on a plurality of jigs (fixed point support jigs) 4 whose heights are adjusted along the curved surface of each wall member 2.3. A plurality of fixed point supporting jigs 4 are arranged at regular intervals in the vertical and horizontal directions and are fixed on a flat workbench.

In this way, each curved wall member 2.3 is brought into the state shown in FIG.
After setting, weld along welding line 1. In addition, in the construction of hull blocks, after welding each curved wall member (curved outer plate) 2.3, the internal structure members (which form the internal structure) are welded.
(not shown) are all arranged and welded together to assemble the hull block.

In the conventional welding method as shown in Fig. 1, the weld line 1 is
Since it is integrally curved, the inclination changes depending on the location and the welding conditions change, making it difficult to use an automatic welding machine.

In addition, even if all automatic welding machines are used, it is impossible to weld in one pass using the high heat input, single-sided, low-pass welding method, etc., and it is necessary to weld several times (for example, 4 to 5 times). However, there is a problem in that welding takes a lot of time. As described above, it is difficult to use an automatic welding machine, so in the conventional welding method, a manual welding machine is generally used, and the welding time is 7 tons. Manual welding machines can only perform bath welding at a slow welding speed of, for example, 40 crn/m, and the bath tangent length is, for example, 1
When assembling an outer panel such as 5771, welding must be performed multiple times (multiple passes) at such low speeds, which poses a problem in that the welding operation takes a long time.

Furthermore, in the conventional welding method, as mentioned above, the welding conditions vary depending on the location, so there is a problem in that the welding requires complete skill.

The purpose of the present invention is to solve the above-mentioned drawbacks of conventional welding methods.
The welding conditions can be set to -M when welding a curved surface. Therefore, by using an arbitrary welding method such as a high heat input single-sided thin welding method using an automatic welding machine, welding can be performed in a short time without requiring any skill. An object of the present invention is to provide a welding method for a curved wall member that can be welded.

In the present invention, a curved wall part, which is a non-welded member, is supported by a plurality of fixed point support jigs arranged on the upper surface of a mount such as a surface plate, and the weld line is moved by a plurality of elevating devices. The above objective is achieved by controlling it so that it is always horizontal.

That is, according to the present invention, there is provided a method for welding together a plurality of curved wall members that are temporarily attached to each other, the wall member being disposed on the upper surface of the frame and having a height that follows the curved surface of the wall member. The wall member is supported by a plurality of fixed point support jigs, the pedestal is tiltably supported by a plurality of lifting devices, and each of the lifting devices is controlled so that the instantaneous weld line element of the weld line is always horizontal. A method for welding a curved wall member is provided, which is characterized in that the welding is carried out while the welding is performed.

FIG. 2 is a diagram showing an example of an apparatus for implementing the method of the present invention, and FIG. 3 is a diagram showing a modified example of the apparatus for implementing the method of the present invention.

The method of the present invention will be specifically explained below with reference to FIGS. 2 and 3.

In FIG. 2, a plurality of fixed point support jigs 6 are installed on the upper surface of a flat pedestal 5 such as a surface plate at predetermined intervals vertically and horizontally. Each fixed point support jig 6 is a support jig whose height is adjustable. The pedestal 5 is tiltably supported by a plurality of lifting devices 7. In the illustrated example, the pedestal 5 is supported at its four corners by four lifting devices 7. Each lifting device 7 operates independently and its height can be adjusted to the entire respective line device. The lifting device 7 can use, for example, a hydraulic jack, but it is also possible to use other types of cylinders or mechanical lifting devices such as an I/G type.

The height of each fixed point supporting jig 6 can also be adjusted to a predetermined value, and when supporting the curved wall member 2.3, the height of the fixed point supporting jig 6 can be adjusted to a predetermined value. Adjust the height to match the curved surface.

During the welding work, first, a plurality of temporarily attached (two in the illustrated example) curved wall members 2.3 are attached to each of the fixed point support jigs 6 whose heights are adjusted along these curved surfaces. Support as shown. Next, each lifting device 7 is operated to adjust the inclination angle of the pedestal 5. Adjustment of the inclination of the pedestal 5 is controlled by a separately provided device (not shown) so that the instantaneous weld line element of the weld line 1, that is, the welding position, is always horizontal. That is, the inclination at each welding position is memorized in advance based on the curved state of the welding line 1, and the inclination angle of the frame 5 is successively adjusted based on the welding speed of the automatic welding machine, the welding position, etc. so that the welding position is always horizontal. Adjust to.

In this way, by controlling the welding location so that it is always horizontal while welding along welding line 1, the welding conditions (the angle of inclination of the welded part) can always be maintained at the optimum conditions, making it possible to use a highly efficient automatic welding machine. By fully adopting this method, it is possible to use the high heat input single-sided thin welding method that is used for welding smooth steel plates.
1) Welding can be completed with 1) dust). Therefore,
Compared to conventional welding methods, the welding time can be significantly reduced, and the entire welding process can be completed within a short time.

Further, according to the above embodiment, by employing a high-performance automatic welding machine, reliable welding can be performed safely, and manual welding that requires skill as in the past is not required.

The welding equipment for curved wall sections shown in Figure 3 is the equipment v shown in Figure 2.
Instead of the lifting device 7 that lifts up the pedestal 5 from below, a lifting device is used in which the hanging rope 8 is hoisted up and lowered by a hoist 9. The other configurations are substantially the same as those shown in FIG. 2, and corresponding parts are designated by the same reference numerals and detailed explanation thereof will be omitted.

In the apparatus shown in FIG. 3, the four corners of the pedestal 5 are supported by hanging ropes 8, and each rope 8 is configured to have its hoisting amount independently controlled by an independent hoisting machine 9. The operation of each hoisting wall 9, that is, the amount of hoisting of each rope 8, is controlled by an appropriate control device (as in the embodiment shown in FIG. (not shown), welding line 1
The instantaneous welding line element, that is, the welding position, is continuously controlled so that it is always horizontal.

Therefore, by implementing the method of the present invention using all of the equipment shown in Figure 3, it is possible to achieve the same effects as when all of the equipment shown in Figure 2 is used, and a significant reduction in welding time is achieved. be able to.

In the embodiments shown in FIGS. 2 and 3 above, the case where two curved wall members 2.3 are welded has been described, but the method of the present invention is also applicable to welding three or more curved wall members. can be adapted to.

In addition, the uninvented method can be applied not only to welding curved wall members made of steel plates such as curved outer panels of ships, but also to welding butts and curved members made of other metal plates such as aluminum. Able to adapt. Furthermore, the method of the present invention can be widely applied to welding metal curved plate members used in various structures ranging from large to small.

As is clear from the above explanation, according to the present invention, welding conditions are kept constant by always maintaining the welding position horizontally, thereby making it possible to employ a highly efficient automatic welding method and achieving a significant reduction in welding time. A method for welding a curved wall member is obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing a conventional welding method for curved wall members, FIG. 2 is a schematic explanatory diagram showing an example of a device for implementing the welding method for curved wall members according to the present invention, and FIG. It is a schematic explanatory drawing which shows another example of the apparatus for carrying out the welding method of the curved wall part paulownia according to this invention. 1... Welding line, 2.3... Curved wall member, 5... Frame, 6... Fixed point stationery, 7... Lifting device, 8... Hanging rope (lifting device), 9 ...Hoisting machine (lifting device)
Agent Tatsuyuki Unuma (and 2 others)

Claims (1)

[Claims] (1) A method of welding together a plurality of curved wall members that are temporarily attached to each other, the method comprising a plurality of fixed point supports having a height along the curved surface of the wall member arranged on the top surface of the frame. Then, the wall part is supported, the frame is tiltably supported by a plurality of lifting devices, and the welding is performed while controlling each of the lifting devices so that the instant welding line element of the weld line is always horizontal. A method for welding curved wall members that is characterized by bending.