KR20010003553A - A submerged arc one side welding method - Google Patents

Abstract

PURPOSE: A submerged arc single groove welding method is provided to increase the easiness of a welding work and to enhance a welding quality. CONSTITUTION: A ceramic rear soldering material(2) is attached to a rear face of two base materials(1) with an aluminum adhesive tape(3). Metallic powder(5) or metallic grains(5') are sprayed in a welding groove(4). A flux is sprayed on the metallic powder or grains. A preceding electrode(6) of a single pole method is supplied in the flux. A single arc is generated between a front end of the electrode and the base material so that a rear face bead(7) is formed. A following electrode(8) of a twin pole method is supplied to the welding groove. A surface bead(9) is formed by generating a twin arc between the front end of the electrode(8) and the base material. Thus, a welding work is readily performed and a welding quality is improved.

Description

A submerged arc one side welding method

The present invention relates to a method of welding a submerged arc one side, and more particularly, to a ceramic back dam material made of glass fiber and solid flux on the back surface of two base materials with aluminum adhesive tape and having a single pole type in the flux. A submerged arc one-side welding method in which a single arc is generated by supplying a preceding electrode to form a back bead, and a trailing electrode of twin pole type is fed to a welding groove in which a back bead is formed to form a surface bead. will be.

In general, in the manufacturing process of large steel structures such as ships, butt joints are divided into two-sided welding welding the butt joints of steel from both sides and one-sided welding welding only the upper portion, and double-sided welding has to be turned over after welding of the upper plate. Because of this, one-sided welding has been widely developed and widely used.

In addition, submerged arc welding applies a granular solvent, or flux, to the joints of the two substrates and continuously supplies the welding wire therein, generating an arc between the wire tip and the substrate to generate heat. It is a method of welding the base metal. The generated arc heat melts the wire, steel and flux, and the molten flux is formed of slag and the molten metal forms weld beads.

Such submerged arc welding is capable of high current welding, which is highly thermally efficient as compared with various welding methods, and may generate a fusion rate of about 4 to 5 times higher than that of coated arc welding.

On the other hand, according to the prior art, the conventional single-sided welding method using the submerged arc welding as described above, first attaching the ceramic backing material using an electromagnet or a jig on the back surface of the two base materials, and flux cored arc welding (flux cored) After arc welding was performed several times, the submerged arc welding was performed by applying flux to the joint.

However, in the conventional welding method as described above, since the electromagnet or the jig is used to prevent the ceramic backing material from being separated during welding, the work is very troublesome.

In addition, even if the two-electrode method of the preceding electrode and the following electrode is adopted to enable high-speed welding, since a single pole method in which one welding wire is supplied to each electrode is used, spaces are formed on both sides of the welding wire in the welding groove, so that welding defects are reduced. There was a problem that occurred.

The present invention has been proposed to solve the problems of the prior art as described above, by attaching a ceramic backing material consisting of glass fiber and solid flux on the back surface of the two base materials with aluminum adhesive tape and feeding the preceding electrode of the single pole type into the flux. A submerged arc that generates a single arc to form a backside bead and feeds a twin-pole trailing electrode into a welding groove having a backside bead to form a surface bead, thereby doubling the welding work and greatly improving the welding quality. The purpose is to provide a one-side welding method.

1 is a process chart showing the main process of the submerged arc one-side welding method according to the present invention.

2 is a schematic view showing the overall welding process according to the present invention.

* Description of the symbols for the main parts of the drawings *

1: base material 2: ceramic backing material

2a: glass fiber 2b: solid flux

3: aluminum adhesive tape 4: welding groove

5: metal powder 5 ': metal grain

6: Leading electrode 7: backside bead

8: trailing electrode 9: surface bead

d: inter-gap distance

In the welding method according to the present invention for achieving the above object, a submerged arc single side for welding the two base materials by applying a flux to the welding groove of the two base materials and generating an arc in the flux using the preceding electrode and the following electrode. In the welding method:

Attaching a ceramic backing material consisting of a glass fiber and a solid flux on the back surfaces of the two base materials with aluminum adhesive tape;

Spraying metal powder or metal grains on the welding groove;

Applying said flux on said spread metal powder or metal grains;

Feeding the preceding electrode of the single pole type into the coated flux to form a single arc between the tip of the electrode and the base material to form a backside bead;

And feeding the trailing electrode of the twin pole type into the welding groove having the backside bead to form a surface bead by generating a twin arc between the tip of the electrode and the base material.

Preferably, the gap distance between the preceding electrode and the following electrode is defined as 30 to 150mm.

There may be a plurality of embodiments of the present invention. Hereinafter, the most preferred embodiment will be described in detail with reference to the accompanying drawings.

This preferred embodiment allows for a better understanding of the objects, features and advantages of the present invention.

1 is a process diagram showing the main process of the submerged arc one-side welding method according to the invention, Figure 2 is a schematic diagram showing the overall welding process according to the present invention.

As shown in the drawing, the welding method according to the present invention attaches the ceramic backing material 2 made of the glass fiber 2a and the solid flux 2b to the back surface of the two base materials 1 with the aluminum adhesive tape 3 (S11). And spraying the metal powder 5 or the metal grains 5 'onto the welding groove 4 (S12), applying the flux thereon, and feeding the preceding electrode 6 of the single pole type into the flux. A single arc is generated between the tip of the end 6 and the base material 1 to form the backside bead 7 (S13), and the trailing electrode of the twin pole type is formed in the welding groove 4 in which the backside bead 7 is formed. 8) is fed to generate a twin arc between the tip of the electrode 8 and the base material (1) to form a surface bead (9) (S14).

The submerged arc one-side welding method of the present invention having the welding process as described above will be described in more detail at each step as follows.

First, the ceramic backing material 2 composed of the glass fiber 2a and the solid flux 2b is attached to the back surfaces of the two base materials 1 with an aluminum adhesive tape 3 to prevent the molten metal from melting during welding (S11). ).

Then, the welding wire most similar to the component of the base material 1 being welded is cut to have a diameter of about 0.5 to 1.5 mm, and the metal powder 5 or the metal grain 5 'is inserted into the welding groove 4. Spray to a thickness of ˜15 mm. This is for the metal powder 5 or the metal grains 5 'to be melted in the welding process to be performed later to increase the deposition amount.

Next, the flux is applied onto the metal powder 5 or the metal grains 5 'and a single pole type preceding electrode 6 is fed into the applied flux, and the electrode 6 is disposed between the tip of the electrode 6 and the base material 1. A single arc is generated to form the backside beads 7 (S13).

Subsequently, the trailing electrode 8 of the twin pole type is fed to the welding groove 4 having the backside bead 7 formed thereon, thereby generating a twin arc between the tip of the electrode 8 and the base material 1 so that the surface bead 9 ) Is formed (S14).

Here, since the twin arcs are generated in the flux by the trailing electrode 8, defects due to poor fusion are prevented in advance. That is, since there is almost no space in both sides of the electrode 8 in the welding groove 4, penetration failure is prevented and welding quality improves significantly.

At this time, when the distance d between the preceding electrode 6 and the trailing electrode 8 is not appropriate, the preceding electrode 6 in which the twin arc generated by the trailing electrode 8 has already formed the backside bead 7 is formed. ), The backside beads 7 may be poorly formed.

Therefore, the gap distance d between the preceding electrode 6 and the following electrode 8 is spaced apart to maintain 30 to 150 mm so that no mutual interference occurs.

As described above, in the present invention, since the ceramic backing material is attached to the back surface of the two base materials with aluminum adhesive tape, the welding work is not cumbersome and very easy, and the twin bead-type trailing electrode is fed to the welding groove on which the back bead is formed to surface bead. Since it is formed to prevent the poor penetration has an effect that the welding quality is greatly improved.

Claims (2)

In the submerged arc one-sided welding method, in which a flux is applied to welding grooves of two base materials and arcs are generated in the flux by using a preceding electrode and a following electrode to weld the two base materials: Attaching a ceramic backing material consisting of a glass fiber and a solid flux on the back surfaces of the two base materials with aluminum adhesive tape; Spraying metal powder or metal grains on the welding groove; Applying said flux on said spread metal powder or metal grains; Feeding the preceding electrode of the single pole type into the coated flux to form a single arc between the tip of the electrode and the base material to form a backside bead; Submerged arc single-side welding comprising the step of feeding the trailing electrode of the twin-pole method to the welding groove formed the back bead to form a surface bead between the tip of the electrode and the base material to form a surface bead Way. The method of claim 1, A submerged arc one-side welding method, characterized in that the gap distance between the preceding electrode and the following electrode is defined to be 30 to 150 mm.