JPS62254972A - Three o'clock welding method - Google Patents

Abstract

PURPOSE:To execute satisfactory three o'clock welding without weld defects by injecting an inert gas toward the lower part of the molten pool of weld beads and executing multi-layer building-up while preventing the sagging of the beads. CONSTITUTION:A welding torch 5 and a gas nozzle 6 are directed from a three o'clock position to a groove 1 in a horizontal direction formed of upper and lower vertical plates 3, 4. A welding wire 7 is led together with a shielding gas out of the top end of the welding torch 5 to form the molten pool 8 in the groove. An inert gas such as Ar similar to the shielding gas is injected at 5Nl/min flow rate from the gas nozzle 6 toward the lower part of the molten pool 8. As a result, the sagging of the molten pool like a dotted line shown in the figure is prevented and since the molten pool is formed to a concave shape, the lack of fusion and slag inclusion are eliminated and the satisfactory three o'clock welding is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention includes welding beads formed in multiple layers from the lateral direction within a horizontal Q groove formed by upper and lower vertical plates.

This relates to a horizontal welding method for welding upper and lower vertical plates.

[Prior art and its problems]

In the horizontal welding method, the welding torch is directed from the side toward the horizontal groove formed by the upper and lower vertical plates, and the welding wire supplied from the welding torch along with the shielding gas forms multiple layers of weld beads within the groove. This is used to weld the vertical plate below.

In such horizontal welding methods, the weld bead built up inside the groove due to high current and large heat input sag to the vertical plate side below. A large number of fine welding beads 2 are deposited in multiple layers with a small welding current in the welding material 1 to weld the upper and lower vertical plates 3.4. Note that 11 is made of backing material.

However, the method of stacking a large number of fine weld beads 2 in multiple layers within the groove 1 not only causes poor appearance of the weld beads 2 due to fluctuations in the target position of the welding wire, but also causes the weld bead 2 and the upper and lower vertical plates 3° Welding defects such as poor fusion between the groove surfaces 3a and 4a of No. 4 and between the weld beads 2 and 2, and slag entrainment into the weld bead 2 were likely to occur.

[Purpose of the invention]

In view of the above-mentioned current situation, this invention has been developed to prevent weld beads from sagging even with high current and high heat input, thereby making it possible to successfully weld vertical plates on top and bottom without causing welding defects. The purpose is to provide a method.

[Summary of the invention]

This invention forms a multi-layered weld bead in a horizontal groove formed by upper and lower vertical plates using a welding wire that is supplied along with a shielding gas from the side,
Accordingly, in the horizontal welding method in which the upper and lower vertical plates are welded, an inert gas is injected toward the lower part of the molten pool of the weld bead built up in the groove, so that the weld bead sag. The present invention is characterized in that the weld bead is deposited in multiple layers within the groove while preventing the weld bead from falling down.

[Structure of the invention]

Hereinafter, the horizontal welding method of the present invention will be explained in detail based on the drawings.

FIG. 1 is a front view showing one embodiment of the welding method of the present invention, and FIG. 2 is a side view.

In Figures 1 and 2, 5 is a welding torch that is directed laterally to the horizontal groove 1 formed by the upper and lower vertical plates 3 and 4, and 6 is the welding torch rearward in the welding direction indicated by the arrow with respect to the welding torch 5. This is a gas nozzle directed laterally to the groove 1. Note that 11 is a backing material.

The welding wire 7 is led out from the tip of the welding torch 5 together with the shielding gas, and forms a molten pool 8 and a weld bead in the groove 1 by the welding wire 7. The gas nozzle 6 is connected to the molten pool 8
towards the bottom of the shielding gas, Ar, C
An inert gas such as O2 is injected at a flow rate of, for example, 5 Nl/m to prevent the molten pool 8 from hanging down as shown by the dotted line in FIG. 2, and to form a concave shape as shown by the solid line. . As a result, as shown in FIG. 3, cone-cape-shaped weld beads 9 and 1o are built up in the groove 1, which prevents sagging, which is less likely to cause defects during welding of each layer.

In this case, in order to reduce welding defects, the present invention increases the welding heat input and increases the welding torch 5.
Even if the molten pool 8 is formed into a large size by weaving, since the inert gas is injected from the gas nozzle 6, large weld beads 9, 10 that prevent drooping can be easily obtained.

In this invention, as described above, since each weld bead is raised in the groove 1 while preventing it from sagging, it goes without saying that the weld bead 9 of the first layer and the weld bead 10 of the second and subsequent layers are Weld beads 9, 10 and groove surfaces 3 of upper and lower vertical plates 3, 4
There is no defective fusion between the weld beads 9 and 4a, and there is no slag entangled in these weld beads 9 and 10.

Therefore, the upper and lower vertical plates 3 and 4 can be satisfactorily welded without causing any welding defects.

〔Effect of the invention〕

According to this invention, the upper and lower vertical plates can be satisfactorily welded without causing any welding defects.

[Brief explanation of drawings]

FIG. 1 is a front view showing one embodiment of the welding method of the present invention, FIG. 2 is a side view of the same, and FIG. 3 is a weld bead built up in the groove by the welding method of FIGS. 1 and 2. FIG. 4 is a side view showing a weld bead built into the groove by a conventional welding method. In the drawing, l...Horizontal groove 3...Upper vertical plate 4...
Lower vertical plate 5... Welding torch 6... Gas nozzle 7... Welding wire 8... Molten pool
9: Weld bead of the first layer 10: Weld bead of the second layer and thereafter.

Claims (1)

[Claims] Multi-layered welding beads are built up in the horizontal groove formed by the upper and lower vertical plates by a welding wire that is supplied together with a shielding gas from the side, and thereby In the horizontal welding method of welding the upper and lower vertical plates, an inert gas is injected toward the lower part of the molten pool of the weld bead built up in the groove to prevent the weld bead from drooping. . A horizontal welding method, characterized in that the weld bead is stacked in multiple layers within the groove.