JPS62118974A - Welding method for narrow gap member - Google Patents

Abstract

PURPOSE:To form the penetration bead having a correct dimentional accuracy by providing the water soluble deformation preventing material which prevents the welding deformation on a narrow gap part and by welding by providing the copper plate which is formed in the size and shape of a heat resistant particle layer and penetration thereupon. CONSTITUTION:A groove 17 is formed close to a rib 12 by using a water soluble deformation preventing material 16 on the narrow gap part, in case of welding a base metal 11 and upper plate 14. A heat resistant particle layer 18 is filled up in the prescribed thickness in this groove 17, the copper plate 19 which bevels one corner is placed thereon as a backing material and pressed so that the upper face thereof is coincided with the height of the rib 12. Thereafter, the heat resistant particle layer is packed in the gap of the side face of th4e copper plate 19 and deformation preventing material 16 so that the copper plate 19 is adhered to the rib 12. The TIG welding is performed by mating the upper plate 14 in such state.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for welding narrow gap members, and in particular to a method for welding narrow gap members,
[Prior Art] Conventionally, narrow gap members are welded as shown in FIG. 2, for example.

1 in the figure is a base material (lower plate) having a lip 2 on the upper part. A top plate 4 having a groove 3 is provided on the base material 1. Note that 5 in the figure is a weld metal layer formed on the groove 3. Here, when welding the base metal 1 and the upper plate 4f, a water-soluble deformation prevention material 6 is used to prevent welding deformation in the narrow gap, and a heat-resistant flux 117f is used to form a back wave.
This is done by providing the groove 8 as low as the required back wave length.

[Problem that the invention seeks to solve]

However, the prior art has the disadvantage that when welding with a large current, unequal leg lengths and large undulating beads 9 are formed as shown in FIG.

Therefore, in order to obtain a Uranami bead with high dimensional accuracy, it was necessary to provide a backing material that would not melt even when the Uranami bead came into contact with it.The present invention was made in consideration of the above circumstances. It is an object of the present invention to provide a narrow gap welding method that has the universal effect of obtaining a Uranami bead with accurate dimensional accuracy.

[Means for solving problems]

The present invention provides a water-soluble deformation prevention material that prevents welding deformation in the narrow gap, and on top of this water-soluble deformation prevention material, a heat-resistant particle layer and a copper plate formed and processed into the size and shape of Uranami are provided. It is characterized by performing welding using a method of welding, thereby making it possible to form a Uranami bead with accurate dimensional accuracy.

[Effect]

According to the present invention, it is possible to obtain a Uranami bead with high dimensional accuracy by forming it into the required size and shape of the Uranami bead and providing a secondary copper plate.

However, by filling the heat-resistant particle layer between the water-soluble deformation prevention material and the steel plate, the copper plate can be set accurately. Furthermore, when a heat-absorbing copper plate comes into direct contact with a water-soluble deformation prevention material, the deformation prevention material changes due to heat and generates gas harmful to welding. This can be prevented.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 3.

Reference numeral 11 in the figure is a base material (lower plate) made of, for example, Or-Mo steel and has a rib 12 with a height of 10 m on its upper part. An upper plate 14 made of, for example, Or-Mo steel and having a groove 13 is provided on the base material 1 . Note that 15 in the figure is a weld metal layer formed on the grooves 1 and 3.

That is, in this embodiment, when welding the base material 11 and the upper plate 14, first, a water-soluble deformation prevention material 16 made of commercially available disintegrated gypsum for castings is used in the narrow groove part, and a width is applied near the lip 12. 10 items,
A groove 11f with a depth of 8 m was formed. Subsequently, this groove 17 was filled with a commercially available heat-resistant particle layer 18 for Uranami welding to a thickness of about 3 m, and one corner of the f-plane was deposited on top of the layer 18 to a width of 8+ m and a thickness of 611 m.
Place the copper plate 19 of No. 11 as a backing material, and
Pressing ratio to match the height of 12. Thereafter, the gap between the side surface of the copper plate 19 and the deformation prevention material 16 is also filled with a layer of heat-resistant particles so that the copper plate 19 is brought into close contact with +)f12. Then, in this state, align the upper plate 14 and perform TIG
Remember to weld. As a result, an accurate Uranami bead 20 having a cross-sectional shape as shown in FIG. 4 and a leg length of 2 m was obtained.

According to the present invention, the following effects are achieved.

(2) By providing the water-soluble deformation prevention material 16 in the narrow gap, shrinkage and deformation during welding can be prevented, and an accurate narrow gap height can be maintained. Also, by immersing it in welding condensate, the deformation preventing material 16 is disintegrated or softened and can be easily removed.

(2) The FC steel plate 19'fI-'lll is formed into the required shape and size of the Uranami bead and provided as a backing material.9th, an accurate Uranami bead can be obtained. This will be explained below.

That is, the temperature of the molten steel metal is about 1500° C., but it is localized just below the weld. On the other hand, the copper plate 19 has a melting point of 1100°C, but because it has good thermal conductivity, even when molten metal comes into contact with it, it absorbs the temperature of the contact surface sufficiently and solidifies, forming a Uranami bead. Therefore, by forming the Uranami bead into the required shape and dimensions and then providing the steel plate 19 as a backing material, it is possible to obtain an Uranami bead with high dimensional accuracy.

■ Heat-resistant particle layer 18 between steel plate 19 and deformation prevention material 16
Since the copper plate 19f is provided, the copper plate 19f can be set accurately.

Further, for the same reason, when the heat-absorbing steel plate 19 comes into direct contact with the deformation prevention material 16, the deformation prevention material 16 changes due to heat and generates gas harmful to welding. This can be completely prevented by the particle layer 18.

In the above embodiments, a steel plate is used as the backing material, but the material is not limited to this, and a water-cooled copper plate may be used to promote the cooling effect.

Further, in comparison with the above embodiment, when a copper plate (backing material) 19 having the same height as the rib 12 is used as shown in FIG. Due to slight welding shrinkage deformation, the copper plate 19 is separated from the base material 11 and the upper plate 14.
It was difficult to remove it.

〔Effect of the invention〕

As described in detail above, according to the present invention, it is possible to provide an entire method for welding narrow gap members that has the universal effect of obtaining a Uranami bead with an accurate dimension of n degrees.

[Brief explanation of drawings]

FIG. 1 is a perspective view illustrating a method for welding a narrow gap member according to an embodiment of the present invention, FIG. 2 is a perspective view illustrating a conventional welding method f for a narrow gap member, and FIG. is a sectional view of the welded part in Fig. 1, Fig. 4 is a sectional view of the welded part by the method of the present invention, and Fig. 5 is a sectional view to explain all the defects of the conventional method.
FIG. 6 is a sectional view for explaining the case where a copper plate having the same height as the ribs is used. ! I...Base metal, 12...Rig, I3...Group, No4...Top plate, 15...Weld metal layer, 16...Water-soluble deformation prevention material, I7...・Groove, 18...Heat-resistant particle layer, 19...Copper plate, 2Q...Uranami Beat 9゜Applicant's sub-agent Patent attorney Takeshi Suzue l3rd floor! ! J Figure 5 1i4 Figure 6

Claims (1)

[Claims] In the method of welding narrow-gap members, a water-soluble deformation prevention material is provided in the narrow gap to prevent welding deformation, and a heat-resistant particle layer is formed on top of this water-soluble deformation prevention material to form the dimensions and shape of Uranami. A method for welding narrow gap members, characterized by performing welding by providing a copper plate with