JPS5847944B2 - Joint welding method for skin material and aggregate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of welding a skin material and aggregate joint, which is suitable exclusively for the construction of ship hull blocks.

Generally, when constructing a hull block, steel plates 1 and 1 are butt welded together as a skin material, as shown in Fig. 1, or aggregate 2 is fillet welded to skin material 1, as shown in Fig. 2. Although it is necessary, conventionally care has been taken to ensure that the butt joint 3 between the skin materials 1 and 1 and the fillet weld portion 4 between the skin material 1 and the aggregate 2 do not overlap, as shown in Fig. 3. .

That is, if the aggregates 2 are fillet welded to this part after the skin materials 1 and 1 are butt-welded together, the previously butt-welded part will be adversely affected.

However, in such a conventional method, two steps are required: butt welding between the skin materials 1 and 1, and fillet welding between the skin material 1 and the aggregate 2.
Since it is necessary to carry out a process and care must be taken to avoid polymerization at the welded portion, various problems such as an increase in cost are caused in terms of design and workmanship.

The present invention aims to solve these problems.
It is an object of the present invention to provide a method for efficiently and inexpensively welding skin materials together and attaching frame-shaped aggregate to skin materials.

Therefore, in the joint welding method for skin material and aggregate of the present invention, the aggregate is welded so that the upper end of the aggregate is located along the lower center line of the butt joint groove between adjacent skin materials. The skin material is placed on top of the frame-shaped structure, and a backing member is applied to the lower surface of the groove of the skin material and the side surface of the upper end of the aggregate, and then the adjacent skin materials are placed on top of each other. The groove part and the upper end of the aggregate are simultaneously welded.

The method of welding a skin material and aggregate joint according to an embodiment of the present invention will be explained below with reference to the drawings. Figures 4 to 6 are explanatory diagrams showing the preparation process according to the method of the present invention, and Figure 7 is an explanatory diagram showing the preparation process according to the method of the present invention. It is an explanatory view showing a welding process by a method.

First, preparations are made by assembling steel aggregate 10 into a frame shape as shown in FIG. 4, and placing steel skin material 11 on this as shown in FIG. , 11 so that the upper end of the aggregate 10 is located along the lower centerline 12 of the mutual butt joint grooves.

Then, as shown in FIG. 6, a copper backing member 13 is applied to the lower surface of the groove of the skin material 11 and the upper end side surface of the aggregate 10, and then the skin materials 11 and 11 are attached to each other as shown in FIG. The groove portion and the upper end of the aggregate 10 are simultaneously welded from above.

As the material for the backing member 13, other than copper, firebrick, asbestos, etc. can be used.

In this way, according to the joint welding method of skin material and aggregate of the present invention, butt welding of the skin materials 11 and 11 and fillet welding of the aggregate 10 to the skin material 11 can be carried out at the same time. Moreover, by using the backing member 13, the front and back sides of the joint can be completed at the same time, which can significantly improve work efficiency. There is an advantage in that the pair of skin materials 11, 11 to be connected to each other can be placed on top of the welding material, and welding can be carried out very easily from above.

Furthermore, as shown in FIG. 8, the amount of weld metal can be adjusted by selecting the backing member 13, and as shown in FIGS. 9 and 10, the shape of the backing member 13 can be changed to increase or decrease the amount of weld metal. The outer shape can also be made into a desired shape.

Furthermore, according to the method of the present invention, in conventional fillet welding, the first
As shown in Figure 1, the weld throat is designed taking into account the shearing force it receives, whereas the fillet part of the weld is designed as a soft tow to simply avoid stress concentration, as shown in Figure 12. In the method of the present invention, the stress flow is lower than in the conventional case (see arrow in Fig. 11).
(see arrow in FIG. 12) is extremely advantageous.

Regarding distortion due to welding, in the conventional case, after fillet welding, downward bending distortion occurs as shown in Fig. 13, and
After butt welding, upward bending strain occurs as shown in FIG. 14, but in the method of the present invention, these welds are performed simultaneously, which has the advantage of canceling out and reducing the strain.

Furthermore, according to the method of the present invention, using single-sided automatic welding,
There is also the advantage that the amount of deposited metal can be reduced by changing the groove as shown in FIG. 15 or 16.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of butt joint welding, Fig. 2 is an explanatory diagram of fillet joint welding, Fig. 3 is a perspective view showing the conventional joint welding method of skin material and aggregate, and Figs. This figure shows a joint welding method for skin material and aggregate as an embodiment of the invention. Figures 4 to 6 are explanatory diagrams showing the preparation process according to the method of the present invention, and Figure 7 is a welding method according to the method of the present invention. FIGS. 8 to 10 are explanatory diagrams showing modifications of the backing member in the method of the present invention; FIG. 11 is an explanatory diagram showing the flow of stress in a conventional fillet weld; Fig. 12 is an explanatory diagram showing the flow of stress in a welded part by the method of the present invention, Figs. 13 and 14 are explanatory diagrams showing the occurrence of strain in a conventional welded part, and Figs. 15 and 16. Both are explanatory diagrams showing an example of the case where one-sided automatic welding is used in the method of the present invention. 10... aggregate, 11... skin material, 12.
...Lower center line of groove for butt joint between skin materials, 13...Backing member.

Claims (1)

[Claims] 1. Place the skin material on top of a frame-like assembly of aggregates so that the upper end of the aggregate is placed along the lower center line of the butt joint groove between adjacent skin materials. At the same time, a backing member is applied to the lower surface of the groove of the skin material and the side surface of the upper end of the aggregate, and then the groove portions of the adjacent skin materials and the upper end of the aggregate are simultaneously welded. A joint welding method for skin material and aggregate, characterized by the following.