JPH0418949B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a preheating device for heating a welding part before welding.

<Prior art> Preheating the weld zone before welding slows down the cooling rate of the weld zone, improves the toughness of the weld zone, facilitates hydrogen release, prevents cold cracking, and prevents cold cracking during welding. It is one of the effective means for performing good welding, such as suppressing shrinkage deformation caused by.

FIG. 4 shows a preheating device for performing such preheating on a welding member. The preheating device shown in the figure is called a preheating surface plate, and this preheating surface plate 50 is a panel material 56.
A plurality of members, for example reinforcing members 58, are placed on top in substantially parallel,
Moreover, it is used when welding at approximately equal intervals. Its configuration is such that a support column 5 is placed on a fixed surface plate 52.
4 are installed at equal intervals, a panel material 56 which is a member to be welded is placed on the upper end of this support column 54, and reinforcing material 58 to be welded to this panel material 56 is placed on this panel material 56 at a predetermined position. At the same time, the preheating burner 60 is installed directly below the reinforcing material 58. Then, a welding machine 62 for welding the reinforcing material 58 and the panel material 56 is moved on the panel material 56 along the reinforcing material 58 (that is, in a direction perpendicular to the drawing), and in synchronization with this, the preheating burner 60 is used for the welding. machine 62
The welding area is heated appropriately prior to welding.

<Problems to be Solved by the Invention> However, in the preheating surface plate 50, the support columns 5
4 is fixed on the fixed surface plate 52, if the installation interval of the reinforcing materials 58 welded to the panel material 56 is changed appropriately, some of these reinforcing materials 58 will be placed near directly above the supporting columns 54. Therefore, there was a problem in that the preheating burner 60 could not be properly installed directly under the reinforcing member 58, that is, at the welded portion.

<Means for Solving the Problems> The present invention solves the above problems and aims to provide a preheating surface plate that can always place a preheating burner directly under the welding part and perform accurate preheating. The preheating surface plate is constructed by making the support column that supports the welded member and the preheating burner movable together on the surface plate.

<Function> When placing the preheating burner directly under the welding area,
Since the support column supporting the welded material also moves, the preheating burner can be placed at any position without contacting the support column.

<Example> FIG. 1 shows a preheating surface plate 2 as an example of the present invention, in which a panel material 4, which is a member to be welded, is placed on a support column 8 of a preheating mechanism 6.

This preheating surface plate 2 is provided with several preheating mechanisms 6 on a fixed surface plate 10, and supports the panel material 4 by support columns 8 of the preheating mechanisms 6. The preheating mechanism 6 is not fixed integrally with the fixed surface plate 10 and is movable on this fixed surface plate 10.

As shown in FIGS. 2 and 3, the preheating mechanism 6 includes an H-shaped running rail 12, a support column 8 connected to the running rail 12 via an arm 14, and a running rail 12. A spring 1 is installed at the bottom of the support column 8.
A running wheel 20 supported on 8 is mounted. The support columns 8 are provided in a substantially vertical direction at substantially equal distances on both the left and right sides of the running rail 12, and a pair of such support columns 8 are attached at equal intervals in the longitudinal direction of the running rail 12. The running wheel 20 is a wheel rotatably mounted so as to run in any direction, and is provided at the lower end of the support column 8 so as to protrude by a spring 18, and nothing is placed on the support column 8. At times, the spring 18 protrudes to support the preheating mechanism 6 so that it can move freely.

The preheating burner 16 has a crater 24 attached to the upper part of a running carriage 22, and is configured to run on the running rail 12 by wheels 26 provided on the running carriage 22. Reference numeral 28 indicates a flame ejected from the crater portion 24, and reference numeral 29 indicates a cable line, gas pipe, etc. for traveling control.

Next, an example of preheating work using the preheating surface plate 2 described above will be described. Preheating mechanism 6 on fixed surface plate 10
is arranged on the fixed surface plate 10 so that the nozzle part 24 of the preheating burner 16 on the running rail 12 is equal to the set interval of the reinforcing material 30 to be welded to the panel material 4. Once the preheating mechanism 6 is arranged in this way, the panel material 4 is placed on the support column 8, and the reinforcing members 30 are arranged on the panel material 4 at the predetermined intervals. Then, the weight of the panel material 4, the reinforcing material 30, etc. compresses the spring 18 provided at the bottom of the support column 8, and the traveling wheel 20
is housed so that the support column 8 comes into direct contact with the fixed surface plate 10. The preheating burner 16 is now placed directly under each reinforcing material 30, and before the self-propelled welding device 32 that welds the panel material 4 and the reinforcing material 30 advances, the preheating burner 16 is placed directly under each reinforcing material 30. The welding device 32 is made to travel at the same speed as the welding device 32 while maintaining a distance. The distance interval is such that when the welding device 32 welds, the welding point is heated to the optimum temperature for welding.

Therefore, according to the preheating surface plate 2 of this embodiment, the support columns 8 are attached to the running rail 12 on which the preheating burner 16 runs.
are integrally attached to form a preheating mechanism 6, and this preheating mechanism 6 is placed on a fixed surface plate 10 so that it can be placed at any position, and the panel material 4, which is the material to be welded, is supported by this preheating mechanism 6. Therefore, even if the preheating burner 16 is set in accordance with the position of the reinforcing material 30 to be welded on the panel material 4, the preheating burner will not come into contact with the support column attached to the fixed surface plate as in the conventional example. No matter where the reinforcing material 30 is welded on the panel material 4, preheating can be performed reliably.

<Effects of the Invention> According to the present invention, the preheating burner and the support column are integrated and can be moved to any position on the fixed surface plate, so that no matter where the preheating area is set, it can be supported. Since it is not restricted by the pillars, the preheating burner can be properly placed and preheating can be performed.

[Brief explanation of drawings]

Figures 1 to 3 are related to the present invention;
The figure is a perspective view showing one embodiment of the preheating surface plate, Figure 2 is a plan view of Figure 1, Figure 3 is a front view of Figure 1, and Figure 4 is a front view of Figure 1.
The figure is a front view showing a conventional preheating surface plate. In the drawing, 2 and 50 are preheating surface plates, 4 and 56 are panel members, 8 and 54 are support columns, 10 and 52 are fixed surface plates, and 16 and 60 are preheating burners.

Claims (1)

[Claims] 1. A preheating surface plate characterized in that a support column that supports a member to be welded and a preheating burner are movable together on the fixed surface plate.