Nozzle for flux cored arc welding

Abstract

The present invention provides a nozzle for flux-cored arc welding. One embodiment of a nozzle for flux-cored arc welding according to an embodiment of the present invention comprises: a hollow nozzle housing; a hollow tip assembly coupled to the interior of the nozzle housing and having a feeding hole defined for supplying a flux-cored wire; and a hollow packing member coupled to the interior of the nozzle housing such that at least a portion thereof is positioned between the inner surface of the nozzle housing and the outer surface of the tip assembly; wherein the nozzle housing and the tip assembly are formed from a metal material, and the packing member is formed from a ceramic material.

Description

Technology Field

[0001] The present invention relates to a nozzle for flux-cored arc welding. Background Technology

[0002] Welding is a method in which base materials are joined by melting them through heat or / and pressure. In double arc welding, the base materials and the welding rod are joined by melting them through the heat of the arc generated when voltage is applied between the base materials and the welding rod. In particular, Flux Cored Arc Welding (FCAW) is a welding method in which a flux-cored wire (FCW), in which flux is enclosed inside the welding rod, is supplied at a preset speed, and the base materials and the flux-cored wire are joined by melting them through the heat of the arc generated by the voltage applied between the base materials and the flux-cored wire.

[0003] Flux-cored arc welding of this type can be classified into gas-shielded flux-cored arc welding and self-shielded flux-cored arc welding depending on whether a shielding gas is used to prevent oxidation or nitridation of the molten metal base material. In the case of gas shielding, the weld area is protected from oxidation or nitridation by inert gases such as argon or carbon dioxide, active gases, and / or gases and slag generated from the flux. On the other hand, in self-shielding, the weld area is protected only by gases and slag generated from the flux. Therefore, in self-shielded flux-cored arc welding, a relatively large amount of welding spatter is generated, which raises concerns that the nozzle, particularly the tip from which the wire is substantially drawn, may be shielded or damaged, and

[0004] Various technologies are being proposed to solve this problem. First, in Prior Art 1 (Republic of Korea Registered Patent No. 10-1804723), a nozzle body (110) is molded from a ceramic material, and a contact tip (50) is coupled to an intermediate body (110) made of a metal material that is integrated with the nozzle body (110) inside. Then, in Prior Art 2 (Republic of Korea Registered Patent No. 10-2252157), a welding tip portion (20) made of a ceramic material is installed at the tip of a contact tip (10), and a welding wire (W) is inserted and installed in the contact tip (10) and the welding tip portion (20).

[0005] However, the following problems occur with nozzles based on such conventional technology.

[0006] First, in the case of prior art 1, joining the nozzle body (110) and the intermediate body (110) is not easy. Prior art 1 also discloses that both are integrated by brazing.

[0007] In addition, in the case of prior art document 2, not only must a hollow welding tip portion (20) of significantly small size be formed, but if the contact tip (10) and the welding tip portion (20) are not accurately aligned, the welding wire supplied through them will not be aligned coaxially with the contact tip (10) and the welding tip portion (20). Therefore, in the case of prior art document 2, particularly during automated welding, the contact tip (10) and the tip of the welding wire (W) will not be aligned coaxially, which may ultimately lead to a deterioration in welding quality. Prior art literature

[0008] Korean Registered Patent No. 10-1804723 (Title: Ceramic nozzle for carbon dioxide welding torch and method for manufacturing the same) Korean Registered Patent No. 10-2252157 (Title: Ceramic welding tip) The problem to be solved

[0009] The present invention aims to solve the problems of the prior art as described above. The objective of the present invention is to provide a flux-cored arc welding nozzle configured to prevent tip shielding during the welding process with a simpler configuration.

[0010] Another objective of the present invention is to provide a flux-cored arc welding nozzle configured to enable more accurate welding. means of solving the problem

[0011] One embodiment of a flux-cored arc welding nozzle according to an embodiment of the present invention for solving problems caused by the prior art as described above comprises: a hollow nozzle housing; a hollow tip assembly coupled to the inside of the nozzle housing and having a feeding hole defined for supplying a flux-cored wire; and a hollow packing member coupled to the inside of the nozzle housing such that at least a portion is positioned between the inner surface of the nozzle housing and the outer surface of the tip assembly; wherein the nozzle housing and the tip assembly are formed from a metal material, and the packing member is formed from a ceramic material.

[0012] In one embodiment of the present invention, the tip of the tip assembly is located inside the nozzle housing, and the tip of the packing member is located between the tip of the nozzle housing and the tip of the tip assembly.

[0013] In one embodiment of the present invention, the diameter of the tip of the connecting hole is formed to be the same as the diameter of the feeding hole, and the diameter of the connecting hole gradually increases from the tip toward the other end connected to the tip of the feeding hole.

[0014] In one embodiment of the present invention, a barrier gap is defined between the nozzle housing and the packing member to prevent heat transfer between the nozzle housing and the packing member.

[0015] In one embodiment of the present invention, the barrier gap is defined such that the inner surface of the tip of the nozzle housing and the outer surface of the tip of the packing member are spaced apart from each other.

[0016] In one embodiment of the present invention, the nozzle housing is provided with a cap that extends from its tip toward the center of the nozzle housing and shields the barrier gap. Effects of the invention

[0017] The following effects can be expected from the flux-cored arc welding nozzle according to an embodiment of the present invention.

[0018] First, in an embodiment of the present invention, a ceramic packing member coupled to the nozzle housing together with the tip assembly prevents spatter generated during the welding process from fusing to the tip assembly, while also enabling easy removal of spatter that has fused to the packing member. In particular, in an embodiment of the present invention, the ceramic packing member is not fixed to the metal nozzle housing or / and tip assembly by an additional process such as brazing, but is fixed by being press-fitted and coupled to both. Therefore, according to an embodiment of the present invention, shielding of the tip assembly during the welding process can be prevented with a simpler configuration.

[0019] In addition, in an embodiment of the present invention, substantially, with the packing member coupled inside the nozzle housing, the tip of the packing member is positioned between the nozzle housing and the tip of the tip assembly, thereby preventing exposure to the outside. In particular, in an embodiment of the present invention, a barrier gap is defined between the nozzle housing or tip assembly and the packing member to prevent heat transfer to the tip assembly through the packing member. Accordingly, according to an embodiment of the present invention, thermal deformation of the tip assembly through which the wire passes or / and damage to the packing member is prevented, thereby enabling accurate wire feeding and ultimately enabling accurate welding. Brief explanation of the drawing

[0020] FIG. 1 is a perspective view showing a flux-cored arc welding nozzle according to a first embodiment of the present invention. FIG. 2 is an exploded perspective view showing a first embodiment of the present invention. FIG. 3 is a longitudinal section view showing a first embodiment of the present invention. FIG. 4 is a longitudinal cross-sectional view showing a flux-cored arc welding nozzle according to a second embodiment of the present invention. FIG. 5 is a longitudinal section view showing a flux-cored arc welding nozzle according to a third embodiment of the present invention. Specific details for implementing the invention

[0021] Hereinafter, an embodiment of a nozzle assembly for flux-cored arc welding according to the first embodiment of the present invention will be described in more detail with reference to the attached drawings.

[0022] FIG. 1 is a perspective view showing a flux-cored arc welding nozzle according to a first embodiment of the present invention, FIG. 2 is an exploded perspective view showing a first embodiment of the present invention, and FIG. 3 is a longitudinal cross-sectional view showing a first embodiment of the present invention.

[0023] Referring to FIGS. 1 to 3, the flux-cored arc welding nozzle (1) according to the present embodiment includes a nozzle housing (100), a tip assembly (200), and a packing member (300). In particular, in the present embodiment, the packing member (300) can prevent the tip assembly (200) from being contaminated or / and damaged by spatter, etc., generated during the welding process.

[0024] More specifically, the nozzle housing (100) may be coupled to a torch (not shown) or defined as part of the torch. Substantially, the nozzle housing (100) defines the appearance of the nozzle (1).

[0025] The tip assembly (200) is for supplying a flux-cored wire (not shown, hereinafter referred to as 'wire') and is coupled inside the nozzle housing (100). To this end, the tip assembly (200) is formed as a hollow where a feeding hole (210) through which the wire is supplied is defined. Additionally, the tip assembly (200) is provided with a spacing projection (220). The spacing projection (220) protrudes in a roughly spiral shape from the outer surface of the tip holder (200A) and contacts the inner surface of the nozzle housing (100), thereby maintaining the tip assembly (200) in a state coupled inside the nozzle housing (100).

[0026] Meanwhile, in the present embodiment, the tip assembly (200) includes a tip holder (200A) and a tip body (200B). The tip holder (200A) substantially contacts the inner surface of the nozzle housing (100) while being coupled inside the nozzle housing (100). The tip body (200B) is coupled to the tip end of the tip holder (200A). At this time, the outer surface of the tip body (200B) contacts the inner surface of the packing member (300).

[0027] In this embodiment, the tip assembly (200) includes a tip holder (200A) and a tip body (200B) coupled to the tip holder (200A). When the tip assembly (200) is coupled inside the nozzle housing (100), the outer surface of the tip holder (200A) contacts the inner surface of the nozzle housing (100), and the outer surface of the tip body (200B) contacts the inner surface of the packing member (300).

[0028] Meanwhile, generally, the nozzle housing (100), tip holder (200A), and tip body (200B) are each formed from a metal material. For example, the nozzle housing (100) and tip holder (200A) may be formed from brass, and the tip body (200B) may be formed from copper. Accordingly, the nozzle housing (100), tip holder (200A), and tip body (200B) are at risk of being damaged by fusion of spatter, etc., and in particular, spatter, etc. penetrating into the interior of the nozzle housing (100) through the tip of the nozzle housing (100) may be fused, thereby blocking the tip of the tip holder (200A), i.e., the feeding hole (210).

[0029] In this embodiment, the occurrence of such problems is minimized by the packing member (300). That is, the packing member (300) is formed from a hollow ceramic material and is coupled inside the nozzle housing (100) such that at least a portion is positioned between the inner surface of the nozzle housing (100) and the tip assembly (200), substantially, the outer surface of the tip body (200B). A connecting hole (310) is formed in the packing member (300). The connecting hole (310) is substantially where the flux-cored wire supplied through the feeding hole (210) passes. Accordingly, the front end of the connecting hole (310) is positioned to face the front end of the nozzle housing (100), and the other end of the connecting hole (310) is connected to the front end of the feeding hole (210).

[0030] For example, the packing member (300) may be coupled to the nozzle housing (100) after the tip assembly (200) is coupled to the nozzle housing (100), or the tip assembly (200) and the packing member (300) may be coupled to the nozzle housing (100) while they are coupled. Additionally, in this embodiment, the packing member (300) may be fixed by simply press-fitting it into the nozzle housing (100) or the nozzle housing (100) and the tip assembly (200).

[0031] In particular, the tip of the tip body (200B) is located inside the nozzle housing (100), and the tip of the packing member (300) is located between the tip of the nozzle housing (100) and the tip of the tip body (200B). Therefore, the phenomenon of the tip of the tip body (200B), i.e., the feeding hole (210), being blocked by spatter or the like can be prevented.

[0032] In the present embodiment configured as described above, even if spatter or the like penetrates into the interior of the nozzle housing (100) through the tip of the nozzle housing (100), it is fused to the packing member (300), thereby minimizing the phenomenon of the feeding hole (210) formed at the tip of the tip assembly (200), particularly the tip body (200B), being blocked. In addition, since the packing member (300) is molded from a ceramic material, the removal of spatter or the like fused thereto can be easily performed. Furthermore, since the packing member (300) does not protrude outside the nozzle housing (100), it can be managed relatively easily.

[0033] Hereinafter, an embodiment of a nozzle assembly for flux-cored arc welding according to the second embodiment of the present invention will be described in more detail with reference to the attached drawings.

[0034] FIG. 4 is a longitudinal cross-sectional view showing a flux-cored arc welding nozzle according to a second embodiment of the present invention. For components of this embodiment that are identical to those of the first embodiment of the present invention described above, the reference numerals of FIG. 1 to 3 are used, and a detailed description thereof is omitted.

[0035] Referring to FIG. 4, in the flux-cored arc welding nozzle (2) according to the present embodiment, the diameter of the tip of the connecting hole (310) is formed to be the same as the diameter of the feeding hole (210), and the diameter of the connecting hole (310) gradually increases from the tip toward the other end connected to the tip of the feeding hole (210). This is to minimize the phenomenon in which the wire supplied through the feeding hole (210) passes more easily through the connecting hole (310), and spatter, etc. penetrate into the interior of the nozzle housing (100) through the packing member (300), substantially through the connecting hole (310), and fuse to the tip assembly (200), particularly the tip body (200B), thereby shielding the connecting hole (310).

[0036] In other words, in this embodiment, the diameter of the connecting hole (310), which serves as an inlet for spatter and the like to penetrate, is substantially set to be the same as the diameter of the feeding hole (210), thereby minimizing the penetration of spatter and the like within a range that does not interfere with the supply of the wire. Furthermore, by gradually increasing the diameter of the connecting hole (310) from its tip toward the other end connected to the tip of the feeding hole (210), the phenomenon of interference with the supply of the wire at the connection portion between the feeding hole (210) and the connecting hole (310) is prevented, and at the same time, a reduction in heat transfer due to the reduction in the contact area between the tip assembly (200) and the packing member (300) can also be expected.

[0037] Hereinafter, a flux-cored arc welding nozzle according to the third embodiment of the present invention will be described in more detail with reference to the attached drawings.

[0038] FIG. 5 is a longitudinal cross-sectional view showing a flux-cored arc welding nozzle according to a third embodiment of the present invention. For components of this embodiment that are identical to those of the first embodiment of the present invention described above, the reference numerals of FIG. 1 to 3 are used, and a detailed description thereof is omitted.

[0039] Referring to FIG. 5, in the flux-cored arc welding nozzle (3) according to the present embodiment, a barrier gap (G) is formed between the nozzle housing (100) and the packing member (300). The barrier gap (G) prevents heat transfer between the nozzle housing (100) and the packing member (300), and substantially serves to minimize the tip assembly (200).

[0040] More specifically, the barrier gap (G) is defined by the inner surface of the tip of the nozzle housing (100) and the outer surface of the tip of the packing member (300) being spaced apart from each other. For example, the barrier gap (G) can be defined by increasing the inner diameter of the tip of the nozzle housing (100) or decreasing the inner diameter of the tip of the packing member (300).

[0041] In addition, in this embodiment, a cap (110) is provided on the nozzle housing (100). The cap (110) serves to shield the barrier gap (G). In other words, the cap (110) is substantially intended to prevent spatter, etc. from penetrating into the interior of the nozzle housing (100) through the barrier gap (G). To this end, the cap (110) extends from the tip of the nozzle housing (100) toward the center of the nozzle housing (100) to shield the barrier gap (G).

[0042] Within the scope of the basic technical concept of the present invention, many other variations are possible for those skilled in the art, and the scope of the rights of the present invention should be interpreted based on the appended claims. Explanation of the symbols

[0043] 1, 2, 3: Flux-cored arc welding nozzle 100: Nozzle housing 110: Cap 200: Tip assembly 200A: Tip holder 200B: Tip body 200B1: Front part 200B2: Rear part 210: Feeding hole 220: Contact projection 300: Packing member 310: Connecting hole G: Barrier gap

Claims

Claim 1 A hollow nozzle housing (100) formed from a metal material; a hollow tip assembly (200) formed from a metal material and coupled to the interior of the nozzle housing (100), having a feeding hole (210) through which a flux-cored wire is supplied; a hollow packing member (300) formed from a ceramic material and coupled to the interior of the nozzle housing (100) such that at least a portion is positioned between the inner surface of the nozzle housing (100) and the outer surface of the tip assembly (200), having a connecting hole (310) through which a flux-cored wire supplied through the feeding hole (210) passes. A flux-cored arc welding nozzle comprising, wherein the packing member (300) is press-fitted and fixed to at least one of the nozzle housing (100) and the tip assembly (200) such that its tip is positioned between the tip of the nozzle housing (100) and the tip of the tip assembly (200), and a barrier gap (G) is defined between the nozzle housing (100) and the packing member (300) to prevent heat transfer between the nozzle housing (100) and the packing member (300). Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 A flux-cored arc welding nozzle according to claim 1, wherein the barrier gap (G) is defined by the inner surface of the tip of the nozzle housing (100) and the outer surface of the tip of the packing member (300) being spaced apart from each other. Claim 6 A flux-cored arc welding nozzle according to claim 5, wherein the nozzle housing (100) is provided with a cap (110) that extends from its tip toward the center of the nozzle housing (100) and shields the barrier gap (G).

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