KR20130073574A - Submerged arc welding methods of the backing - Google Patents

Submerged arc welding methods of the backing Download PDF

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Publication number
KR20130073574A
KR20130073574A KR1020110141497A KR20110141497A KR20130073574A KR 20130073574 A KR20130073574 A KR 20130073574A KR 1020110141497 A KR1020110141497 A KR 1020110141497A KR 20110141497 A KR20110141497 A KR 20110141497A KR 20130073574 A KR20130073574 A KR 20130073574A
Authority
KR
South Korea
Prior art keywords
backing
copper plate
flux
pocket
glass fiber
Prior art date
Application number
KR1020110141497A
Other languages
Korean (ko)
Inventor
이원구
한명수
Original Assignee
대우조선해양 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 대우조선해양 주식회사 filed Critical 대우조선해양 주식회사
Priority to KR1020110141497A priority Critical patent/KR20130073574A/en
Publication of KR20130073574A publication Critical patent/KR20130073574A/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/18—Submerged-arc welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/02—Seam welding; Backing means; Inserts
    • B23K9/035—Seam welding; Backing means; Inserts with backing means disposed under the seam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/32—Accessories
    • B23K9/325—Devices for supplying or evacuating shielding gas

Abstract

PURPOSE: A submerged arc welding backing method is provided to adhere a backing flux to a rear side of a base material by uniformly arranging not to be leaned to one part, thereby preventing damage of a copper plate due to an arc as well as controlling the height of a back bead of the rear side. CONSTITUTION: A submerged arc welding backing method includes following steps. A backing flux is inserted into a pocket in a rear side of a base material for supporting the rear side of the base material (S1). A glass fiber pad supports a bottom surface of the pocket in which the backing flux is inserted (S2). A copper plate supports a bottom surface of the glass fiber pad (S3). An air hose pressurizing the copper plate to an upper side is inserted into a lower part of the copper plate as air is supplied in a case (S4). [Reference numerals] (S1) Backing flux is inserted into a pocket; (S2) Glass fiber pad is supported; (S3) Glass fiber pad is supported; (S4) Glass fiber pad is inserted into a case

Description

Submerged arc welding methods of the backing}

The present invention relates to a backing method of submerged arc welding (SAW), and more particularly, the backing flux is uniformly aligned without close contact with the back surface of the base material during submerged arc welding, and the back bead (Back bead) height control as well as a method of backing submerged arc welding to prevent damage to the copper plate due to the arc.

In general, large structures that require welding, such as ships, require vertical butt welding or horizontal butt welding in PE and mounting stages to connect blocks and blocks made up of small plates, such as arc welding and electrogas welding. , Electron beam welding, resistance welding, gas welding and friction welding.

In this application, submerged arc welding (SAW) will be described among such butt welds.

Submerged arc welding refers to an automatic welding method in which an arc is generated and welded in a state in which a solid wire is supplied from a flux of solid flux placed on a base material and covered with flux. The flux in contact with the arc melts and the molten slag covers the molten metal to protect the weld metal. In general, since a large current flows through a large diameter wire, high efficiency welding is performed, and currently, the welding method is applied to about 7% of the total welding.

This submerged arc welding is a high efficiency welding method that can supply current up to 1500 ~ 3000A, deep penetration and poor coupling, so that the weld seam has high reliability, no arc, small arc spark, and clean environment. It had a guaranteed advantage.

In addition, the application of backing is very important in submerged arc welding, that is, copper backing and ceramic backing to form the back bead of the base material and to prevent the molten pool from flowing backward. , Flux backing or mixed backing are used.

As described above, in the conventional submerged arc welding, the conventional backing method generally requires that the ceramic backing material is attached to the back surface of the base material by the worker's manual work before welding and separated after the welding by the worker. There was a waste time that takes too much work time to remove and attach the ceramic backing material.

In order to improve such a problem, as shown in FIG. 4, the backing flux 110, the copper plate 120, and the copper plate are formed on the back surface of the base material 100, which is an object to be submerged arc welded. The FCB (Flux Copper Backing) method, which sequentially includes an air hose 130 to pressurize the backing flux by the air supplied to the rear surface of the base material, was used.

However, in such a backing method of the conventional FCB method, as the copper plate and the backing flux are biased to one side without being uniformly pressurized by pressurization of the air hose, that is, the backing flux located on the upper part of the copper plate is pressurized. As the phenomenon that the copper plate is inclined toward one side or the copper plate is inclined to one side due to the pressurization, the quality is reduced due to the failure of the welded part, and the problem is that the copper plate is damaged due to the arc caused by welding. Not only this problem but also excessive consumption of the backing flux was brought about.

The present invention has been made to solve the above-mentioned conventional problems, the main object of the back bead in the submerged arc welding to back contact flux uniformly aligned without biasing the back bead (back bead) It is to provide a backing method of submerged arc welding, which can prevent the damage of the copper plate due to the arc as well as the height control.

Another object of the present invention is to allow the backing flux to be smoothly aligned to a certain thickness.

It is still another object of the present invention to make the backing flux more closely adhere to the back surface of the base material.

The present invention for solving the above technical problem, the method of backing the back surface of the base material during the submerged arc welding, the step of backing flux is put into the pocket on the back surface of the base material; Supporting a glass fiber pad on a bottom surface of the pocket in which the backing flux is inserted; Supporting a copper plate on a bottom surface of the glass fiber pad; Putting an air hose to press the copper plate to the upper side as air is supplied to the inside of the case under the copper plate; .

The pocket is formed of a glass fiber material having a length equal to a length to be welded in a form in which a backing flux is wrapped to be wrapped.

The glass fiber pad is characterized in that it is formed wider than the width of the pocket and narrower than the width of the copper plate.

The air hose is characterized in that one or at least one or more are laminated inside the case.

In the present invention, when the submerged arc welding, the backing flux is uniformly aligned to the back side of the base material without being unbiased, and it is possible to prevent the damage of the copper plate due to the arc as well as to control the height of the back side bead, so that welding is easy due to the close contact. In addition to the improvement of the quality of the welded part, as well as securing the long service life of the copper plate, it has the effect of high economical efficiency and the additional effect that the working environment can be improved by the minimum amount of backing flux as well as the backing flux. By the amount and the pressing force, it is possible to control not only the height of the backside beads but also to improve the quality.

In addition, by allowing the backing flux by the pocket to be aligned to a certain thickness smoothly, there is also an effect that the backing flux has a uniform thickness and uniformly aligned.

In addition, the stacking of the air hose allows the backing flux to be brought into close contact with the back surface of the base material even more closely, and has an effect of maximizing the improvement of the quality of the welded portion due to easier welding.

1 is a block diagram schematically showing a backing method of the present invention.
Figure 2 is a main view schematically showing a state backed by the present invention.
3 is a schematic view schematically showing the use state of the present invention.
Figure 4 is a principal part schematically showing a backing method of the conventional FCB method.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

1 is a block diagram schematically showing a backing method of the present invention, Figure 2 is a principal part schematically showing a backing state by the present invention.

As shown, a method of backing the back surface of the base material during submerged arc welding, which is an automatic welding method of generating and welding an arc in a state in which solid wires are supplied by supplying a solid wire among the granular fluxes placed on a known base material as shown above. To

The present invention, in order to be able to closely contact the backing flux to the back surface of the base material evenly during submerged arc welding, unbiased, and to prevent the damage of the copper plate due to the arc as well as the height of the back bead (back bead),

The backing flux 110 is put into the pocket 10 on the back surface of the base material 100, and the step S1 is performed while being uniformly aligned without being biased to one side during pressing.

Then, the step (S2) of supporting the glass fiber pad 20 for preventing damage to the copper plate to be described later due to the arc during welding on the bottom surface of the pocket 10, the backing flux 110 is put.

Then, the step (S3) of supporting the copper plate 120 so that a uniform pressing force is applied to the bottom surface of the glass fiber pad 20 is applied.

Then, the copper plate 120 is supplied to the inside of the case 135 in which the bottom, left, and right sides of the copper plate 120 are blocked and the upper portion of the copper plate is opened by a conventional air supply means. Step (S4) is put the air hose 130 having elasticity to press the upper side; Do it.

The pocket 10 is formed of the same length as the length to be welded in a form in which the backing flux 110 is wrapped in a glass fiber material, that is, wrapped in a roll form, and thus the backing encased in the pocket. As the flux is not biased or distorted to one side by pressurization and is aligned to a uniform thickness inside the pocket, the flux is closely adhered to the welded portion, thereby improving the quality of the backside bead according to the welding and minimizing the consumption of the backing flux. It has a condition to do it.

Since the glass fiber pad 20 is formed to be wider than the width of the pocket 10 and narrower than the width of the copper plate 120 to support the pocket when pressurized, the arc blocks the copper plate without transferring the copper plate during arc generation due to welding. It is desirable to be able to prevent damage from this arc.

The air hose 130 is preferably one or at least one or more air hoses 130 are stacked so that the air hose 130 has a high pressing force by the air supplied to the inside of the case 135, that is, the pressing force by one air hose In addition to being able to apply, in the case of stacking one or more of the air hose due to the expansion force between the air hoses, it is preferable to use the air hose laminated as possible.

As described above, according to the present invention, as shown in FIG. 3, the backing flux 110 is inserted into the pocket 10 and the glass fiber pad 20 and the copper plate are sequentially provided in the lower portion of the base material 100. As the air is supplied to the air hose 130 provided in the case 135 in a state in which the 120 is sequentially supported, the air hose 130 is expanded and the copper plate 120 is pressed as the glass on the upper portion thereof. As the pocket 10 into which the fiber pad 20 and the backing flux 110 are put is pressed, the pocket 10 is in close contact with the bottom surface of the base material 100.

In this case, since the backing flux 110 is wrapped in the form of a roll in the pocket 10, the backing flux 110 is arranged in a uniform thickness in the pocket 10 without being biased or disturbed to one side. In addition, the base material may be closely adhered to the bottom of the base material to stabilize the welding quality as well as to improve the quality of the backside beads and to minimize the consumption of the backing flux. At this time, depending on the amount and the pressing force of the backing flux to be put in the pocket, there is also a condition that can be formed to the required height of the rear bead.

In addition, the glass fiber pad 20 has a condition that can prevent the copper plate from being damaged by protecting the copper plate 120 from arcs generated during welding, thereby ensuring a long service life as well as reuse.

Therefore, in the backing method of the present invention, the backing flux is closely adhered to the welded portion with a minimum amount during the welding due to the submerged arc welding, which facilitates the welding and improves the quality of the backside bead. It is possible to prevent the damage of the, by improving the quality of the welded part by the submerged arc welding, as well as to improve the working environment and to ensure a long service life of the copper plate has excellent economic conditions.

10: pocket 20: glass fiber pad
100: base material 110: backing flux
120: copper plate 130: air hose
135: case

Claims (4)

In the method of backing the back surface of the base material 100 during the submerged arc welding,
A step (S1) of supporting the backing flux 110 in the pocket 10 on the back surface of the base material 100;
Supporting the glass fiber pad 20 on a bottom surface of the pocket 10 into which the backing flux 110 is inserted (S2);
Supporting the copper plate (120) on the bottom surface of the glass fiber pad (20) (S3);
A step (S4) of inserting an air hose (130) for pressurizing the copper plate (120) to the upper side as air is supplied to the inside of the case (135) below the copper plate (120); A backing method for submerged arc welding, comprising:
The method of claim 1,
The pocket (10) is a backing method of submerged arc welding, characterized in that the glass fiber material is formed in the same length as the length to be welded in the form wrapped around the backing flux.
The method of claim 2,
The glass fiber pad 20 is wider than the width of the pocket (10) and narrower than the width of the copper plate 120, characterized in that the backing method of submerged arc welding.
The method of claim 2,
The air hose 130 is a backing method of the submerged arc welding, characterized in that one or at least one is laminated in the case (135).
KR1020110141497A 2011-12-23 2011-12-23 Submerged arc welding methods of the backing KR20130073574A (en)

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Application Number Priority Date Filing Date Title
KR1020110141497A KR20130073574A (en) 2011-12-23 2011-12-23 Submerged arc welding methods of the backing

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Application Number Priority Date Filing Date Title
KR1020110141497A KR20130073574A (en) 2011-12-23 2011-12-23 Submerged arc welding methods of the backing

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KR20130073574A true KR20130073574A (en) 2013-07-03

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105772911A (en) * 2016-05-14 2016-07-20 山西阳煤化工机械（集团）有限公司 Submerged automatic arc welding method of steel sheet
KR20180028337A (en) * 2016-09-08 2018-03-16 대우조선해양 주식회사 Method for single SAW welding
KR20210144379A (en) 2020-05-22 2021-11-30 대우조선해양 주식회사 Pipe seam welding method using glass fiber backing material

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105772911A (en) * 2016-05-14 2016-07-20 山西阳煤化工机械（集团）有限公司 Submerged automatic arc welding method of steel sheet
KR20180028337A (en) * 2016-09-08 2018-03-16 대우조선해양 주식회사 Method for single SAW welding
KR20210144379A (en) 2020-05-22 2021-11-30 대우조선해양 주식회사 Pipe seam welding method using glass fiber backing material

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