JPS6039467B2 - How to weld the scalloped part - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an effective method for welding a scalloped portion in a welded steel plate.

Conventionally, in steel plate welding, for example, when welding one steel plate 3 to two steel plates 1 and 2 that are orthogonal to each other as shown in FIG. A scallop 4 is generally formed.

This is because without the scallop 4, the steel plates 1 and 2 would come into direct contact with the corner of the steel plate 3 to be welded, making welding impossible. Position the welding rod on one side of the steel plate 3 to be welded, hold the welding rod diagonally upward toward the scallop front face 5, and perform one-sided welding along one side of the steel plate 3 to be welded starting from the scallop front face 5. Generally, the operator moves to the side of the steel plate 3 and welds the other side of the scallop from the front side 5 again in the same manner as described above. However, in this case, the weld bead at the starting point where one side was first welded will cool and solidify when welding the next side, and the solidified weld bead and the starting point will be wrapped for a certain length and welded on the other side. As a result, the seam of the weld bead at the super point is not well melted and integrated, the bead swells, internal stress is concentrated, the welding strength decreases, and there is a risk of fatigue failure.

The present invention discloses a new welding method that solves the above-mentioned conventional problems, and its gist is to weld the steel plates to be welded diagonally from above on one side of the steel plates in front of the scallops. Weld one side of the steel plate to be welded by facing the rod, and before the weld bead at the starting point has solidified, weld a separate welding bead from the pool side, and overlap the first weld bead by a certain length, and weld the other side of the steel plate to be welded. There is a method of welding a scalloped part, which is characterized by welding.

Hereinafter, the details of the present invention will be explained based on the embodiments shown in the drawings. FIG. 2 is an explanatory diagram showing the welding method according to the present invention, in which two welders each First, a welder located on one side faces the welding rod 6 from diagonally above the scallop front face 5, and points the welding point of the steel plates 3, 2 along one side of the steel plates 3 to be welded with the arrows. A
Weld as shown below.

Another welder located on the opposite side applies the welding rod 6a from the other side in the same manner as described above, before the weld bead at the starting point on the front face 5 of the scallop, which was performed by the first welder, has cooled and solidified. Separately face the steel plate 3 to be welded so that it can overlap the first weld bead by a certain length as shown by arrow B.
Weld along the other side. What is shown in FIG. 3 is for explaining the arrangement of the welding rods 6, 6a with respect to the scallop 4. For example, the first welding rod 6 is set to have a horizontal angle of 30 degrees and a vertical angle of 2 to 3 degrees, as shown in the figure. Perform the first welding with the tip of the welding rod 6 facing point P, which indicates the side edge of the scallop front 5, and the welder on the other side points the welding rod 6
Welding according to the method of the present invention was performed by setting a to a horizontal angle of 400 degrees and a vertical angle of 2 to 3 degrees, and starting welding with the tip of the welding rod 6a directed toward P2, which indicates the middle position of the scallop front face 5. According to the present invention, the next welding is started by another welder while the weld bead at the starting point where welding was first performed is still in a molten state, so that the weld bead at the starting point is now completely melted and integrated. , there is no swelling of the weld bead at the seam, and a good, seamless weld is performed.

Figures 4 to 8 are comparative photographs of the welding method according to the present invention and the welding method of a secondary welding method. Figure 4 is a side view photograph showing the welded state of the four scallops by the welding method of the present invention, and Figure 5 is the same. A front view photograph, and FIG. 6 is a cross-sectional photograph of the same, whereas FIG. 7 is a front view photograph showing a welded state of the scalloped portion by a conventional welding method, and FIG. 8 is a front view photograph of the same.

As is clear from the photograph, in the conventional method, the weld seam on the front face 5 of the SCARA I section has a bulge of flesh, and the joint between the A direction weld and the B direction weld is clearly visible, whereas in the present method In the invention, the welded seam is integrally melted, and there is no visible buildup of the material, resulting in a beautiful finish that looks as if the welding was done continuously in one direction. Also, as seen in the cross-sectional photograph of Fig. 6, the steel plate 2, In contrast to 3, the weld bead is melted integrally, and the weld seam is also completely integrated, ensuring that
It can be seen that the welding is strong. As described above, the present invention places welders on both sides of the steel plate 3 on which the scallops 4 have been formed, and starts the subsequent welding before the first weld bead at the scallop 4 part has solidified. As a result, the weld seam is completely integrated without any build-up of meat, and stress is not concentrated inside, making it possible to achieve good welding with high strength, and there is no build-up of meat. This makes it possible to achieve a beautiful and smooth finish, eliminating the need for roller application for surface finishing, which was previously required.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing the arrangement of steel plates to be welded, Figure 2 is a perspective view showing the welding procedure for the steel plates to be welded, Figure 3a,
b is an explanatory diagram of the arrangement of the welding rod with respect to the scallop of the steel plate to be welded, FIG. 4 is a side view photograph showing the welding state of the scallop part by the welding method of the present invention, and FIG. 5 is a front view photograph of the same.
FIG. 6 is a cross-sectional photograph of the same, FIG. 7 is a front perspective photograph showing a welded state of the scalloped portion by the conventional welding method, and FIG. 8 is a front view photograph of the same. 1, 2... Steel plate, 3... Steel plate to be welded,
4...Scalp, 5...Front side of the scallop, 6, 6a...Welding rod. Figure 3 (a) Figure 3 (b) Figure 4 Figure 1 Figure 2 Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] 1 Steel plate to be welded 3 with scallops 4 formed on the steel plate
In welding, the welding rod 6 is faced from one side of the steel plate 3 to be welded to a suitable welding point on the front face 5 of the scallop, and the steel plate 2 and the steel plate 3 are brought into contact with each other toward the one side. Welding is performed at the welding point, which is the joint, and before the weld bead at the starting point has solidified, the welding rod 6a is separately faced from the other side of the steel plate 3 to be welded to the weld bead on the front 5 portion of the scallop, and the first welding is performed. A method for welding a scalloped part, characterized in that the welding is carried out over a certain length of the bead and then welded toward the other side.