JPH0221180Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a welding device for a closed-section box-shaped column (workpiece).

[Prior art and problems]

Generally, the final corner welding of a closed-section box-shaped column (workpiece) as shown in Figure 1 is performed with the workpiece inserted through a portal welding device, but the arc itself As shown in , distortion occurs due to thermal stress, and the welding posture relative to the torch changes. That is,
Due to this change in welding posture, there will always be a portion in the molten pool where the molten metal flows to the unwelded side.
When the molten metal flows to the unwelded side in this way, the molten metal impedes the penetration of the welded part and causes poor penetration, and the welded part solidifies quickly and the internal air bubbles are not completely released. The problem is that there is no.

For this reason, in the conventional technology, the torch current capacity on the leading and trailing sides is increased to ensure the amount of penetration and to ensure sufficient release of bubbles, but adjusting the torch current capacity in this way The problem remained that the operator had no choice but to rely on his intuition, that is, his skill and experience.

[Means for solving problems]

The present invention was developed in view of the above circumstances, and has a simple yet rational configuration. More specifically, the workpiece receiving part of the support cart that supports both ends of the workpiece can be raised and lowered, thereby solving the problems of the conventional technology. To provide a welding device which can easily perform good welding with uniform penetration and sufficient release of air by appropriately tilting the workpiece so as to eliminate the problem and cause the molten metal in the molten pool to flow toward the welding completion side. and
The structure of the present invention, which solves the problems of the prior art, is such that a closed-section box-shaped column (workpiece), whose both ends are supported on support carts, is passed through a gate-type welding device to weld the corners of the workpiece. The present invention is characterized in that the work receiving portions of both of the support carts are movable up and down.

〔Example〕

The details of the embodiments will be explained with reference to the drawings.

Fig. 1 is a perspective view of the workpiece, showing the corner weld line by the portal welding device, Fig. 2 is a front view of the device of the present invention, and Fig. 3 is a front view showing the posture of the workpiece at the time of starting welding. , FIG. 4 is an explanatory diagram showing the state of penetration of the molten pool, and FIG. 5 is an explanatory diagram of the state of penetration.

An embodiment of the present invention will be described in detail with reference to FIGS. 2 to 5. Reference numeral 1 denotes a portal welding device equipped with welding torches 8 and 9, and the portal welding device 1 is fixed on a foundation 2. Reference numeral 3 denotes a support cart on which both ends of the workpiece 4 are placed and supported. Both support carts 3 automatically run on rails 5 laid on the foundation 2 so as to pass through the gate structure 1a that constitutes the gate type welding device 1. Each supporting cart 3 is provided with a cylinder 7 having a workpiece receiving portion 6, so that the end portion of the workpiece 4 can be raised and lowered as appropriate.

[Explanation of action]

Next, to explain the welding work, when starting welding at the corner of the workpiece, as shown in Fig. 3, the cylinder 7 of the support cart 3 on the opposite side from the welding start end is activated to weld the workpiece 4 as shown in the figure. The workpiece 4 is placed in a position where the starting end side is tilted downward, and the workpiece 4 is arc welded using the leading and trailing torches 8 and 9.
can be moved sequentially in the direction of the arrow. As shown in Figures 4 and 5, the torches 8 and 9 penetrate the welding machine, and the molten metal in the molten pool flows along the slope toward the welding completion side, and takes a sufficient time (for example, 10 This delay in solidification means that the air bubbles in the molten metal are sufficiently released and that the torch penetrates the metal sufficiently, resulting in sufficient and uniform penetration, resulting in a good weld. becomes possible.

As welding progresses, the workpiece 4 itself becomes distorted due to thermal stress, as shown by the imaginary line in Figure 2, and the welding posture of the workpiece changes sequentially, so the cylinder 7 must be operated so that the welding conditions remain constant. , an appropriate welding posture; specifically, the welding posture is maintained so that the molten metal flows toward the welding completion side.

In order to tilt the workpiece 4 and perform good welding as described above, it is necessary to move the workpiece as shown in the example, or to fix the workpiece and perform portal welding. Whether the device is moved or not is arbitrary and is not limited to the example.

Another feature of the present invention is that the workpiece is moved by the support cart 3. Conventionally, in this type of welding apparatus, welding was carried out while the workpiece was supported on a support cart and the portal welding apparatus was moved along the workpiece. Such welding methods for fixing workpieces require crane work to carry the workpieces into and out of predetermined locations, which may impede work efficiency and also require workpiece manufacturing to be carried out on an integrated line. In the case of manufacturing equipment, the manufacturing flow is interrupted at the final stage,
There are problems that make continuous production impossible. In addition, there is a lot of loss in the power supply equipment for the torch, and
There is a lot of vibration in the welding machine, and in order to eliminate this,
Although there are problems such as the need for many preventive measures, these problems can be solved by moving the workpiece as in the present invention.

[Effect of idea]

As described above, according to the present invention, the welding position of the workpiece is changed, more specifically, the welding position is changed so that the molten metal flows toward the welded completion side, and the welding position is changed to ensure sufficient penetration and sufficient solidification time of the molten metal to eliminate air bubbles. It is possible to achieve good welding in which the emission of carbon is completely carried out, and there is no need for the skill of the operator to change the welding conditions based on intuition, unlike in conventional technology, and highly reliable workpiece welding can be performed continuously. It has great practical effects, such as cleaning.

[Brief explanation of drawings]

Fig. 1 is a partial perspective view of a closed cross-section box-shaped column (workpiece), Fig. 2 is a front view of the device of the present invention, Fig. 3 is a front view showing the posture of the workpiece at the start of welding, and Fig. 4 and 5
The figure is an explanatory diagram showing penetration in a molten pool. DESCRIPTION OF SYMBOLS 1... Gate type welding device, 1a... Gate structure, 2... Foundation, 3... Support cart, 4... Work, 5... Rail, 6... Work receiving part, 7... Cylinder, 8, 9
……torch.

Claims (1)

[Scope of Claim for Utility Model Registration] A device in which a closed-section box-shaped column (workpiece) whose both ends are supported on support carts is passed through a gate-type welding device to weld the corners of the workpiece, A welding device for a closed-section box-shaped column, characterized in that the work receiving part of the truck can be raised and lowered.